U.S. patent application number 13/063620 was filed with the patent office on 2011-07-21 for fishing line comprising integrated composite yarn comprising short fiber.
This patent application is currently assigned to Y.G.K CO., LTD.. Invention is credited to Shigeru Nakanishi.
Application Number | 20110173873 13/063620 |
Document ID | / |
Family ID | 42106413 |
Filed Date | 2011-07-21 |
United States Patent
Application |
20110173873 |
Kind Code |
A1 |
Nakanishi; Shigeru |
July 21, 2011 |
FISHING LINE COMPRISING INTEGRATED COMPOSITE YARN COMPRISING SHORT
FIBER
Abstract
The present invention provides a fishing line comprising a
composite yarn having a core-sheath structure, where the composite
yarn comprises a core part having a core yarn containing a short
fiber and a sheath part having a sheath yarn containing a long
fiber; the long fiber in the sheath part and the short fiber in the
core part are intertangled with each other; and the core yarn and
the sheath yarn are integrated with use of an adhesive resin. The
fishing line of the present invention has a robust core-sheath
structure which prevents nude yarn or nep from being developed,
excellent operability, adjustable specific gravity, excellent
tensile strength, high weatherability and water resistance, low
water content, low elongation rate, and low probability of
unravelling constituent fibers at a cut site.
Inventors: |
Nakanishi; Shigeru; (Hyogo,
JP) |
Assignee: |
Y.G.K CO., LTD.
|
Family ID: |
42106413 |
Appl. No.: |
13/063620 |
Filed: |
October 13, 2009 |
PCT Filed: |
October 13, 2009 |
PCT NO: |
PCT/JP2009/005305 |
371 Date: |
April 8, 2011 |
Current U.S.
Class: |
43/44.98 |
Current CPC
Class: |
D02G 3/444 20130101;
A01K 91/00 20130101; D02G 3/40 20130101; D02G 3/36 20130101; D02G
3/44 20130101 |
Class at
Publication: |
43/44.98 |
International
Class: |
A01K 91/00 20060101
A01K091/00 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 14, 2008 |
JP |
2008265128 |
Claims
1. A fishing line comprising a composite yarn having a core-sheath
structure, the composite yarn comprising a core part having a core
yarn containing a short fiber and a sheath part having a sheath
yarn containing a long fiber, the core yarn and the sheath yarn
being integrated with use of an adhesive resin.
2. The fishing line according to claim 1, wherein single yarns of
the short fiber in the core yarn are overlapped, intertangled or
intertwisted.
3. The fishing line according to claim 1, wherein the fiber length
of the short fiber in the core yarn is 5 to 500 mm.
4. The fishing line according to claim 1, wherein the specific
gravity of the short fiber in the core yarn is 1.0 or more.
5. The fishing line according to claim 1, wherein the short fiber
in the core yarn is used for adjusting the specific gravity of the
fishing line.
6. The fishing line according to claim 1, wherein the short fiber
in the core yarn comprises at least one kind selected from the
group consisting of a synthetic fiber, a regenerated fiber, a metal
fiber, a ceramic fiber, and a glass fiber.
7. The fishing line according to claim 1, wherein the short fiber
in the core yarn comprises a polyester fiber, a glass fiber, or a
fluororesin.
8. The fishing line according to claim 1, wherein the long fiber in
the sheath yarn comprises a super strength fiber.
9. The fishing line according to claim 1, wherein the super
strength fiber comprised in the long fiber in the sheath yarn
accounts for 12% by weight or more of the whole composite yarn.
10. The fishing line according to claim 8, wherein the super
strength fiber is an ultra high molecular weight polyethylene fiber
having a molecular weight of 300,000 or more.
11. The fishing line according to claim 1, wherein the sheath yarn
in the sheath part is braded around the core yarn.
12. The fishing line according to claim 1, wherein the sheath yarn
in the sheath part is wound around the core yarn.
13. The fishing line according to claim 1, wherein the long fiber
in the sheath yarn and the short fiber in the core yarn are
intertangled.
14. The fishing line according to claim 1, which has a history of a
drawing treatment under heating or without heating in a production
process of the composite yarn.
15. The fishing line according to claim 1, wherein the long fiber
comprises an ultra high molecular weight polyethylene fiber and the
short fiber comprises a fluororesin fiber.
16. The fishing line according to claim 1, wherein the adhesive
resin is a hot melt adhesive.
17. The fishing line according to claim 1, wherein the adhesive
resin is a polyolefin copolymer, a polyester copolymer, or a
polyamide copolymer.
18. The fishing line according to claim 16, wherein the hot melt
adhesive is a reactive hot melt adhesive.
19. The fishing line according to claim 1, wherein the adhesive
resin comprises a polyolefin resin and a polyurethane resin of
which the glass transition point is 30.degree. C. or higher.
20. The fishing line according to claim 19, wherein the polyolefin
resin is a modified polyolefin resin comprising (A1) an unsaturated
carboxylic acid or an anhydride thereof, (A2) an olefin
hydrocarbon, and (A3) at least one compound selected from the group
consisting of an acrylate ester, a maleate ester, a vinyl ester,
and acrylamide.
21. The fishing line according to claim 1, wherein the adhesive
resin contains metal particles.
22. The fishing line according to claim 1, wherein two or more core
yarns or two or more sheath yarns are paralleled, twisted, or
braided.
23. The fishing line according to claim 1, wherein the outermost
layer is coated with a resin.
Description
TECHNICAL FIELD
[0001] The present invention relates to a fishing line. More
specifically, the present invention relates to a fishing line
comprising an integrated composite yarn comprising a short
fiber.
BACKGROUND ART
[0002] In recent years, advancement of fishing lines has been
remarkable and fishing lines of different properties tailored to
various modes of fishing have been developed. Inter alia, braided
yarns and covered yarns having a core-sheath structure composed of
two or more kinds of fibers including high strength fibers, such as
ultra high molecular weight polyethylene fibers, aramid fibers, PBO
fibers, polyarylate fibers and glass fibers, have attracted
attention because they have high strength, durability and low rate
of elongation suitable for easy and correct perception of a fish
strike.
[0003] Already known as such a fishing line having a core-sheath
structure composed of two or more kinds of fibers are a fishing
line which is a covered yarn comprising a synthetic resin
multifilament yarn as a core yarn and a twisted synthetic resin
multifilament yarn as a sheath yarn wound around the core yarn, the
difference between the angle between the core yarn and the sheath
yarn and the twist angle of the twisted yarn being 25.degree. or
less thereby achieving an excellent breaking strength and knot
strength, low rate of elongation and an excellent abrasion
resistance (Patent Literature 1); a fishing line comprising a
fluorine multifilament fiber as a core yarn and an ultra high
molecular weight polyethylene fiber braided around the core yarn,
which sinks below water surface, is not easily affected by wind
etc., and has a strong abrasion resistance (Patent Literature 2);
and a yarn comprising a glass fiber core yarn and two or more
sheath yarns made of a fiber other than glass fiber, the sheath
yarns being braided around the core yarn, the core yarn and the
sheath yarns being integrated with use of a binder resin, the yarn
having an elongation rate of 5% or less (Patent Literature 3).
[0004] However, these conventional core-sheath fishing lines do not
have sufficient degree of entwinement or binding between the core
part and the sheath part. Therefore, such fishing lines have
problems that the core part and the sheath part separate from each
other and the core yarn slips off, resulting in so-called nude yarn
and that friction between the line guide of a fishing rod etc. and
the fishing line causes the sheath part to separate and partially
form an unorganized mass, so-called nep.
[0005] Meanwhile, a fishing line of which the core part and the
sheath part are integrated by means of thermal fusion bonding or a
binder also has a problem of hardening of the yarn, and resulting
curliness and difficulty in handling.
[0006] In addition, a fishing line made of a super strength fiber,
such as an ultra high molecular weight polyethylene filament, has a
relatively small specific gravity, and therefore is easily affected
by wind or tide. Furthermore, in fast tidal stream or in a
deep-water area, it is difficult to quickly and accurately throw
the fishing line into a fishable depth range. In recent years,
there is a demand from the market for a fishing line with a
specific gravity most suitable for a particular situation, such as
in adverse weather conditions or in an area with rapidly changing
tidal streams. In this context, development of a yarn with a
specific gravity of 1.0 or more, preferably adjustable in the range
of 1.0 or more, has been desired.
[0007] Meanwhile, fishing lines comprising two or more yarns
integrated with use of a resin coating have been known. Examples of
the known fishing lines include a fishing line comprising two or
more filament yarns integrated with use of a hot-melt adhesive and
thereby having both advantages of a monofilament fishing line and
of a braided fishing line (Patent Literature 4) and a fishing line
comprising a yarn comprising two or more polyolefin fibers, wherein
the surface of the yarn is coated with a resin containing dispersed
metal powder particles, resulting in an increased specific gravity
of the fishing line (Patent Literature 5).
Citation List
[Patent Literatures]
[0008] [Patent Literature 1] JP-A-09-31786
[0009] [Patent Literature 2] JP-A-08-140538
[0010] [Patent Literature 3] JP-A-2004-308047
[0011] [Patent Literature 4] JP-A-2003-116431
[0012] [Patent Literature 5] JP-A-04-335849
SUMMARY OF INVENTION
Technical Problem
[0013] An object of the present invention is to solve the
above-mentioned problems of conventional fishing lines having a
core-sheath structure and thereby provide a fishing line having a
robust core-sheath structure which prevents nude yarn or nep from
being developed, excellent operability, adjustable specific
gravity, excellent tensile strength, high weatherability and water
resistance, low water content, low elongation rate, and low
probability of unravelling constituent fibers at a cut site.
Solution to Problem
[0014] To solve the above problems, the present invention includes
the following: [0015] (1) a fishing line comprising a composite
yarn having a core-sheath structure, the composite yarn comprising
a core part having a core yarn containing a short fiber and a
sheath part having a sheath yarn containing a long fiber, the core
yarn and the sheath yarn being integrated with use of an adhesive
resin, [0016] (2) the fishing line according to the above (1),
wherein single yarns of the short fiber in the core yarn are
overlapped, intertangled or intertwisted, [0017] (3) the fishing
line according to the above (1) or (2), wherein the fiber length of
the short fiber in the core yarn is 5 to 500 mm, [0018] (4) the
fishing line according to any of the above (1) to (3), wherein the
specific gravity of the short fiber in the core yarn is 1.0 or
more, [0019] (5) the fishing line according to any of the above (1)
to (4), wherein the short fiber in the core yarn is used for
adjusting the specific gravity of the fishing line, [0020] (6) the
fishing line according to any of the above (1) to (5), wherein the
short fiber in the core yarn comprises at least one kind selected
from the group consisting of a synthetic fiber, a regenerated
fiber, a metal fiber, a ceramic fiber, and a glass fiber, [0021]
(7) the fishing line according to any of the above (1) to (6),
wherein the short fiber in the core yarn comprises a polyester
fiber, a glass fiber, or a fluororesin, [0022] (8) the fishing line
according to any of the above (1) to (7), wherein the long fiber in
the sheath yarn comprises a super strength fiber, [0023] (9) the
fishing line according to any of the above (1) to (8), wherein the
super strength fiber comprised in the long fiber in the sheath yarn
accounts for 12% by weight or more of the whole composite yarn,
[0024] (10) the fishing line according to above (8) or (9), wherein
the super strength fiber is an ultra high molecular weight
polyethylene fiber having a molecular weight of 300,000 or more,
[0025] (11) the fishing line according to any of the above (1) to
(10), wherein the sheath yarn in the sheath part is braded around
the core yarn, [0026] (12) the fishing line according to any of the
above (1) to (10), wherein the sheath yarn in the sheath part is
wound around the core yarn, [0027] (13) the fishing line according
to any of the above (1) to (12), wherein the long fiber in the
sheath part and the short fiber in the core part are intertangled,
[0028] (14) the fishing line according to any of the above (1) to
(13), which has a history of a drawing treatment under heating or
without heating in a production process of the composite yarn,
[0029] (15) the fishing line according to any of the above (1) to
(14), wherein the long fiber comprises an ultra high molecular
weight polyethylene fiber and the short fiber comprises a
fluororesin fiber, [0030] (16) the fishing line according to any of
the above (1) to (15), wherein the adhesive resin is a hot melt
adhesive, [0031] (17) the fishing line according to any of the
above (1) to (16), wherein the adhesive resin is a polyolefin
copolymer, a polyester copolymer, or a polyamide copolymer, [0032]
(18) the fishing line according to the above (16) or (17), wherein
the hot melt adhesive is a reactive hot melt adhesive, [0033] (19)
the fishing line according to any of the above (1) to (18), wherein
the adhesive resin comprises a polyolefin resin and a polyurethane
resin of which the glass transition point is 30.degree. C. or
higher, [0034] (20) the fishing line according to the above (19),
wherein the polyolefin resin is a modified polyolefin resin
comprising (A1) an unsaturated carboxylic acid or an anhydride
thereof, (A2) an olefin hydrocarbon, and (A3) at least one compound
selected from the group consisting of an acrylate ester, a maleate
ester, a vinyl ester, and acrylamide, [0035] (21) the fishing line
according to any of the above (1) to (20), wherein the adhesive
resin contains metal particles, [0036] (22) the fishing line
according to any of the above (1) to (21), wherein two or more core
yarns or two or more sheath yarns are paralleled, twisted, or
braided, and [0037] (23) the fishing line according to any of the
above (1) to (22), wherein the outermost layer is coated with a
resin.
Advantageous Effects of Invention
[0038] According to the present invention, it is possible to
provide a fishing line which has a robust core-sheath structure
which prevents substantial separation or detachment of the core
part and the sheath part, and therefore prevents nude yarn or nep
from being developed, and is resistant to kink, torsion, curliness
in a reel, and thread jamming on a spool, achieving easy handling.
It is also possible to provide a fishing line which has an
outstanding tensile strength and has high weatherability and water
resistance. Further, it is possible to provide a fishing line of
high value and increased versatility, which has a high bendability
and flexibility and a specific gravity adjustable in the range of
1.0 or more.
DESCRIPTION OF EMBODIMENTS
[0039] The fishing line of the present invention is a fishing line
comprising a composite yarn having a core-sheath structure, the
composite yarn comprising a core part having a core yarn containing
a short fiber and a sheath part having a sheath yarn containing a
long fiber, the core yarn and the sheath yarn being integrated with
use of an adhesive resin. First, the composite yarn constituting
the fishing line will be described.
[0040] Preferable examples of the sheath yarn constituting the
sheath part of the composite yarn include a filament yarn made of
two or more of at least one kind of filaments selected from the
group consisting of a monofilament, a multifilament, and a
monomultifilament.
[0041] Examples of the synthetic fiber used for the sheath yarn
constituting the sheath part of the composite yarn include fibers
made of synthetic resins, such as polyolefin, polyamide, polyester,
and polyacrylonitrile resins. The tensile strength of these
synthetic fibers determined with a tensile strength tester, for
example Strograph R tensile strength tester manufactured by Toyo
Seiki Seisaku-Sho, Ltd., according to JIS L 1013 "testing methods
for man-made filament yarns", is usually higher than 8.8 cN/dtex,
preferably 17.6 cN/dtex or higher, more preferably 22.0 cN/dtex or
higher, and most preferably 26.5 cN/dtex or higher. The sheath yarn
comprising a synthetic fiber is preferably a monofilament having a
fineness of about 11 to 3300 dtex, or a monomultifilament composed
of two or more monofilaments, preferably about 3 to 50 paralleled
monofilaments. Alternatively, the sheath yarn comprising a
synthetic fiber is preferably a multifilament composed of two or
more, preferably about 10 to 600 paralleled monofilaments. The
sheath yarn comprising a synthetic fiber may be composed of a
single fiber or two or more kinds of fibers.
[0042] The synthetic fiber is preferably a super strength fiber,
and particularly preferably an ultra high strength fiber. Examples
of the ultra high strength fiber include polyolefin fibers such as
ultra high molecular weight polyethylene fibers having a molecular
weight of 300,000 or more, preferably 500,000 or more, aromatic
polyamide (aramid) fibers, heterocyclic high-function fibers, and
all the aromatic polyester fibers. Inter alia, polyolefin fibers
such as ultra high molecular weight polyethylene fibers having a
molecular weight of 500,000 or more are preferred. More preferred
are ultra high molecular weight polyethylene fibers having a
molecular weight of 1,000,000 or more. Examples thereof include,
besides homopolymers, copolymers with a lower .alpha.-olefin having
about 3 to 10 carbon atoms, such as propylene, butene, pentene,
hexene, or the like. In the case of the copolymer of ethylene with
the .alpha.-olefin, the ratio of the latter per 1000 carbon atoms
is about 0.1 to 20, preferably about 0.5 to 10 on average.
Copolymers having such a ratio show excellent mechanical
properties, such as high strength. The method for producing ultra
high molecular weight polyethylene is described in, for example,
JP-A-55-5228 and JP-A-55-107506.
[0043] The synthetic fiber may comprise an ultra high strength
fiber and a synthetic fiber other than ultra high strength fibers.
The content of the synthetic fiber other than ultra high strength
fibers relative to the ultra high strength fiber is 1/2 or less,
preferably 1/3 or less, more preferably 1/4 or less by weight.
[0044] The ultra high strength fiber used for the composite yarn
may be a heterocyclic high-function fiber in which the amide bond
of the above-mentioned aramid fiber is modified to increase
elasticity of the aramid fiber. Examples of the heterocyclic
high-function fiber include fibers made of poly-p-phenylene
benzobisthiazole (PBZT), poly-p-phenylene benzobisoxazole (PBO), or
the like. The heterocyclic high-function fiber can be produced by
synthesizing PBZT or PBO resin, dissolving the obtained resin in a
suitable solvent, and subsequent dry spinning and drawing. Examples
of the solvent include anisotropic liquids, such as methylsulfonic
acid, dimethylacetamide-LiCl, and the like.
[0045] As the sheath yarn constituting the sheath part of the
composite yarn, two or more monofilaments, multifilaments, or
monomultifilaments are used in a paralleled or twisted form. In the
case of a twisted yarn, the twist coefficient K is 0.2 to 1.5,
preferably 0.3 to 1.2, and more preferably 0.4 to 0.8.
[0046] The sheath part of the composite yarn usually has a
structure in which a yarn made of two or more sheath yarns
paralleled or twisted is braided or wound around the core part. In
the case of a braided yarn, the braiding angle is preferably
5.degree. to 90.degree., more preferably 5.degree. to 50.degree.,
and more preferably 20.degree. to 30.degree..
[0047] The short fiber contained in the core yarn constituting the
core part of the composite yarn is a short fiber having a fiber
length of 5 to 500 mm, preferably 10 to 300 mm, and more preferably
a short fiber (staple) having a fiber length of 15 to 200 mm.
[0048] The short fiber contained in the core yarn constituting the
core part of the composite yarn preferably has a specific gravity
of 1.0 or more. The long fiber contained in the sheath yarn
constituting the sheath part of the composite yarn is preferably an
ultra high molecular weight polyethylene having a specific gravity
of 0.98 and a molecular weight of 500,000 or more. When a fiber of
which the specific gravity is less than 1.0 is used for the sheath
part, using a short fiber of which the specific gravity is 1.0 or
more for the core part enables adjustment of the specific gravity
of the composite yarn without limitation to the specific gravity of
the material constituting the sheath part. Such a composite yarn is
advantageous because the specific gravity of a fishing line can be
finely adjusted depending on the weather or tide.
[0049] The short fiber is produced by, for example, cutting a long
fiber into pieces of a predetermined length. Also, the short fiber
can be produced by various methods: cutting a filament into staples
of a predetermined length, twisting staples to form a spun yarn and
drawing the yarn to obtain irregularly broken fiber pieces, drawing
a filament yarn, such as a multifilament and a monomultifilament to
obtain irregularly broken fiber pieces, or the like.
[0050] It is more preferred that the core yarn which constitutes
the core part is made of two or more single yarns and that the
yarns are arranged in a staple-like form, sequentially arranged in
a longitudinal direction, intertangled or intertwisted inside the
sheath part of the composite yarn. Inter alia, preferred is a
fishing line of which the single yarns of the short fiber form a
cotton-like material inside the sheath part. Such a composite yarn
is excellent in flexibility. The short fiber is preferably
continuous inside the sheath part.
[0051] The short fiber contained in the core yarn constituting the
core part of the composite yarn comprises at least one fiber
selected from a fiber made of a synthetic resin, such as a
polyolefin polymer (for example, polyethylene or polypropylene), a
polyamide polymer (for example, nylon 6 or nylon 66), a polyester
polymer (for example, polyethylene terephthalate),
polytetrafluoroethylene, a fluororesin polymer, a polyacrylonitrile
polymer, or a polyvinyl alcohol polymer; a regenerated fiber, such
as rayon and acetate; a metal fiber, such as iron, copper, zinc,
tin, nickel, and tungsten; a ceramic fiber; a glass fiber; and the
like. Examples of the glass fiber include so-called E-glass
excellent in electric and mechanical properties, C-glass excellent
in chemical resistance, ECR-glass obtained by reducing the alkali
content of C-glass and adding titanium and zinc flux thereto, and
also A-glass, L-glass, S-glass, and YM31-A-glass. Inter alia, the
glass fiber preferably used in the composite yarn constituting the
fishing line of the present invention is a glass free from boron
oxide and fluorine, and has a composition represented by
SiO.sub.2--TiO.sub.2--Al.sub.2O.sub.3--RO (R is a divalent metal,
such as Ca and Mg) or SiO.sub.2--Al.sub.2O.sub.3--RO (R is the same
as above).
[0052] Examples of the above-mentioned fluororesin polymer, which
usually means a fiber obtained from a resin having a fluorine atom
in the molecule, include polytetrafluoroethylene (PTFE), the
copolymer of ethylene tetrafluoride and perfluoroalkyl vinyl ether
(PFA), the copolymer of tetrafluoroethylene and hexafluoropropylene
(FEP), the copolymer of ethylene and tetrafluoroethylene (ETFE),
polychlorotrifluoroethylene (PCTFE), polychlorotrifluoroethylene
(PCTFE), polyvinylidene fluoride (PVDF), and polyvinyl fluoride
(PVF).
[0053] The strength of the short fiber is preferably 4.4 cN/dtex or
less. The single-yarn fineness of the short fiber is preferably 11
dtex or less.
[0054] In the composite yarn constituting the fishing line of the
present invention, short fibers contained in the core yarn
constituting the core part may be independent, or loosely bound and
intertangled or intertwisted. The short fiber is preferably
obtained by breaking a long fiber or a spun yarn.
[0055] The composite yarn constituting the fishing line of the
present invention comprises a core part having a core yarn
containing a short fiber and a sheath part having a sheath yarn
containing a long fiber, and preferably has a structure where fluff
of the short fibers contained in the core yarn constituting the
core part gets between or entangled with the long fibers contained
in the sheath yarn constituting the sheath part and thereby the
friction coefficient between the core and sheath layers is
increased. In addition, in the composite yarn, it is preferred that
the short fiber contained in the core yarn constituting the core
part is intertangled with or enveloped by the long fiber contained
in the sheath yarn constituting the sheath part, via the fluff of
the short fiber. The short fiber in the core part may be bound with
use of a binder to the extent that the objective of the present
invention would not be impaired. By this treatment, the fluff
condition of the short fiber can be adjusted, and a composite yarn
with a smooth surface can be obtained. Publicly known binders may
be used for convenience.
[0056] The fishing line of the present invention is a fishing line
comprising a core yarn and a sheath yarn integrated with use of an
adhesive resin as described above. Integrating the core yarn and
the sheath yarn with use of an adhesive resin contributes to
keeping the elongation rate of the yarn low and to improving the
water resistance and weatherability in addition to the strong
abrasion resistance.
[0057] The adhesive resin used for the fishing line of the present
invention is not particularly limited as long as it is capable of
integrating a core yarn and a sheath yarn, and any publicly known
adhesive resin can be used. Examples of the known adhesive resins
include an acrylic resin, an urethane resin, an unsaturated
polyester resin, an epoxy resin, a fluororesin, a vinyl acetate
resin, and a polyolefin resin.
[0058] The adhesive resin used for the fishing line of the present
invention is preferably a polyolefin copolymer, a polyester
copolymer, or a polyamide copolymer. Among them, preferred is a
polyolefin resin made of a polyolefin copolymer mainly containing
polyethylene, polypropylene, or the like, the polyolefin resin
being a soft resin that can be softened when heated at about
50.degree. C. for about 10 seconds. In addition, a heat adhesive
resin, such as a polyolefin resin having a melting point of about
100.degree. C. and exhibiting low viscosity in its molten state is
also preferred. Such a polyolefin resin easily goes into a
fluidized state when heated for only a short period of time, and
can rapidly diffuse not only across the surface of a composite yarn
but also penetrate into the center thereof, and therefore can exert
an excellent adhesive function.
[0059] The adhesive resin used for the fishing line of the present
invention is preferably a hot melt adhesive. A hot melt adhesive is
a 100% solid, thermoplastic-polymer-based adhesive which is applied
after being melted for lower viscosity and, as it cools, becomes
solidified, exerting adhesive power. The hot melt adhesive used for
the fishing line of the present invention is not particularly
limited as long as it is similar to the ones mentioned above, and
publicly known hot melt adhesives may be used. A hot melt adhesive
which is not melted below about 100.degree. C. after once hardened
is preferably used. Such a hot melt adhesive does not melt or leak
out during transportation or storage of the fishing line, and
therefore solidification of the fishing line in a state wound on a
spool, for example, can be prevented. The melting point of the hot
melt adhesive is preferably lower than that of the constituent
fibers of the composite yarn.
[0060] Examples of the hot melt adhesive used for the fishing line
of the present invention include, for example, depending the type
of the base polymer, ethylene-vinyl acetate copolymer (EVA)
adhesives, polyethylene adhesives, polyolefin adhesives,
thermoplastic rubber adhesives, ethylene-ethyl acrylate copolymer
(EEA) adhesives, polyvinyl acetate copolymer adhesives,
polycarbonate (PC) adhesives, and the like. Inter alia,
polyethylene adhesives or polyolefin adhesives are preferred.
[0061] The hot melt adhesive used for the fishing line of the
present invention is preferably a reactive hot melt adhesive. In a
reactive hot melt adhesive, crosslinking reaction occurs after
adhesion and thereby heat resistance is improved. To be more
specific, in a case where a reactive hot melt adhesive melted at a
relatively low temperature is applied to two or more composite
yarns or where two or more composite yarns are impregnated with
such a melted hot melt adhesive, after once hardened, the adhesive
will not melt again at a low temperature, specifically at a
temperature not higher than about 100.degree. C. Therefore, the use
of a reactive hot melt adhesive minimizes the possibility that the
hot melt adhesive will melt during transportation or storage of the
fishing line.
[0062] The reactive hot melt adhesive is not particularly limited,
and any reactive hot melt adhesive known in the art may be used.
Inter alia, preferred is a reactive hot melt adhesive that can be
melted for application at a relatively low temperature,
specifically about 60 to 130.degree. C., and more preferably at
about 70 to 100.degree. C.
[0063] Specific examples of the above-mentioned reactive hot melt
adhesive can be classified as follows, depending on the type of the
crosslinking reaction: for example, (a) an ion crosslinking hot
melt adhesive in which crosslinking reaction is caused by carboxyl
groups and polyvalent metal ions in a polymer; (b) a thermal
crosslinking hot melt adhesive to be hardened by heating after
adhesion; (c) a hot melt adhesive containing block copolymers or
polyesters having double bonds where crosslinking reaction is
caused by irradiation of high energy beams, such as electron beams
and ultraviolet rays; (d) a moisture curing hot melt adhesive in
which crosslinking is caused by reaction with moisture in the air
or in an adherend after the adhesive is melted and applied; and (e)
a hot melt adhesive in which crosslinking structure is formed by
separately melting a polymer having various functional groups and
an additive or polymer that reacts with the functional groups, and
mixing and reacting these two melted materials immediately before
application.
[0064] The reactive hot melt adhesive used for the fishing line of
the present invention is preferably a thermal crosslinking hot melt
adhesive or a moisture curing hot melt adhesive, and particularly
preferably a moisture curing hot melt adhesive.
[0065] Specific examples of the thermal crosslinking hot melt
adhesive include a hot melt adhesive comprising blocked isocyanate
obtained by blocking (a) a terminal carboxyl group or an amino
group of polyester or copolyamide, or (b) an isocyanate group
introduced into a molecular terminus or a side chain with use of a
blocking agent such as caprolactam and phenol.
[0066] Specific examples of the moisture curing hot melt adhesive
include a hot melt adhesive where an alkoxy group is introduced
into a polymer, a hot melt adhesive where an isocyanate group is
introduced into a polymer, and the like.
[0067] In addition, adhesive resin filaments may be used as part of
two or more core yarns or two or more sheath yarns.
[0068] When an ultra high molecular weight polyethylene is used in
the sheath part, the adhesive resin used for the fishing line of
the present invention is preferably a resin comprising a polyolefin
resin and a polyurethane resin of which the glass transition point
is 30.degree. C. or higher. In the resin comprising a polyolefin
resin and a polyurethane resin of which the glass transition point
is 30.degree. C. or higher, the mass ratio of the polyolefin resin
(A) to the polyurethane resin (B) of which the glass transition
point is 30.degree. C. or higher in the range of 97/3 to 10/90 is
satisfactory. In terms of properties such as blocking resistance,
adhesion and convergence to ultra high molecular weight
polyethylene filaments, and the like, the ratio is preferably 95/5
to 20/80, more preferably 90/10 to 30/70, still more preferably
90/10 to 40/60, and particularly preferably 85/15 to 50/50. When
the (A) content is more than 97% by mass, the blocking resistance
is only poorly improved, and when the (A) content is less than 10%
by mass, the adhesion and the convergence to ultra high molecular
weight polyethylene filaments is extremely low.
Polyolefin Resin (A)
[0069] The polyolefin resin (A) used for the present invention is
preferably a modified polyolefin resin comprising (A1) an
unsaturated carboxylic acid or an anhydride thereof, (A2) an olefin
hydrocarbon, and (A3) at least one compound selected from the group
consisting of an acrylate ester, a maleate ester, a vinyl ester,
and acrylamide. More preferred polyolefin resins satisfy the
following formulae (1) and (2).
0.01<=(A1)/{(A1)+(A2)+(A3)}.times.100<5 (1)
(A2)/(A3)=55/45 to 99/1 (2)
[0070] The (A1) content in the polyolefin resin (A) is preferably
not less than 0.01% by mass and less than 5% by mass, more
preferably not less than 0.1% by mass and less than 5% by mass,
still more preferably not less than 0.5% by mass and less than 5%
by mass, and most preferably 1 to 4% by mass. If the (A1) content
is less than 0.01% by mass, mixing performance with polyurethane
resin (B) is poor. Meanwhile, if the (A1) content is more than 5%
by mass, the polarity of the polyolefin resin (A) is high, and the
adhesion and convergence to ultra high molecular weight
polyethylene filaments are prone to decline. Examples of the
component (A1) include (meth)acrylic acid, maleic acid, itaconic
acid, fumaric acid, and crotonic acid. The unsaturated carboxylic
acid may be in the form of a derivative, such as a salt, an acid
anhydride, a half ester, and a half amide. Inter alia, acrylic
acid, methacrylic acid, and maleic acid (anhydrous) are preferred,
and acrylic acid and maleic anhydride are particularly preferred.
The type of copolymerization of the component is not particularly
limited, and may be any of random copolymerization, block
copolymerization, and graft copolymerization.
[0071] The mass ratio of the component (A2) to the component (A3),
that is (A2)/(A3), is preferably in the range of 55/45 to 99/1. For
favorable adhesion and convergence to ultra high molecular weight
polyethylene filaments, the ratio is more preferably in the range
of 60/40 to 97/3, still more preferably 65/35 to 95/5, particularly
preferably 70/30 to 92/8, and most preferably 75/25 to 90/10. If
the (A3) content is less than 1% by mass, mixing performance with
polyurethane resin (B) may be poor. Meanwhile, if the content of
the compound (A3) is more than 45% by mass, the properties of the
resin of olefin origin is lost, resulting in decline in the
adhesion and convergence to ultra high molecular weight
polyethylene filaments.
[0072] Examples of the component (A2) include olefins having 2 to 6
carbon atoms, such as ethylene, propylene, isobutylene, 1-butene,
1-pentene, and 1-hexene, and a mixture thereof. Inter alia, olefins
having 2 to 4 carbon atoms, such as ethylene, propylene,
isobutylene, and 1-butene, are more preferred, and ethylene is
particularly preferred.
[0073] Examples of the component (A3) include (meth)acrylate
esters, such as methyl (meth)acrylate, ethyl (meth)acrylate, and
butyl (meth)acrylate; maleate esters, such as dimethyl maleate,
diethyl maleate, and dibutyl maleate; vinyl esters, such as vinyl
formate, vinyl acetate, vinyl propionate, vinyl pivalate, and vinyl
versate; acrylamides, such as acrylamide and dimethyl acrylamide;
and a mixture thereof. Inter alia, (meth)acrylate esters are more
preferred, methyl (meth)acrylate and ethyl (meth)acrylate are
particularly preferred, and methyl acrylate and ethyl acrylate are
most preferred. Herein, "(meth)acrylate" means "acrylate or
methacrylate".
[0074] The most preferred specific examples of polyolefin resin (A)
having the above constitution include ethylene-methyl
acrylate-maleic anhydride terpolymer and ethylene-ethyl
acrylate-maleic anhydride terpolymer. The type of the terpolymer
may be any of random copolymerization, block copolymerization, and
graft copolymerization, but in view of availability, a random
copolymer and a graft copolymer are preferred.
[0075] While a resin is hydrophilized, hydrolysis of only a few
ester bonds may occur, converting some acrylic ester units into
acrylic acid units. In such cases, the ratio of each component with
consideration of the conversion should be within each predetermined
range.
[0076] As for the polyolefin resin (A) used for the present
invention, the maleic acid unit in the polyolefin resin containing
maleic anhydride units tends to, in the dry state, have the maleic
anhydride structure in which the adjacent carboxyl groups are
cyclodehydrated, whereas in an aqueous medium containing a basic
compound described later, a part or the whole of the ring is
opened, and the maleic acid unit tends to have the structure of
maleic acid or a salt thereof.
[0077] The polyolefin resin (A) used for the present invention has
a melt flow rate, a measure of molecular weight, of 0.01 to 500
g/10 min, preferably 1 to 400 g/10 min, more preferably 2 to 300
g/10 min, and most preferably 2 to 250 g/10 min at 190.degree. C.
under a load of 2,160 g. If the melt flow rate of the polyolefin
resin (A) is less than 0.01 g/10 min, mixing performance with
polyurethane resin (B) may be poor. Meanwhile, if the melt flow
rate of the polyolefin resin (A) is more than 500 g/10 min, the
resin is hard and brittle, and the adhesion and convergence to
ultra high molecular weight polyethylene filaments decline.
[0078] The synthetic method of the polyolefin resin (A) is not
particularly limited. Generally, the polyolefin resin (A) can be
obtained by high-pressure radical copolymerization of the
constituent monomers in the presence of a radical-generating agent.
The unsaturated carboxylic acid or an anhydride thereof may be
graft-copolymerized (graft-modified).
Polyurethane Resin (B)
[0079] The polyurethane resin used for the present invention (B) is
a polymer having a urethane bond in the main chain, for example, a
polymer that can be obtained by reaction of a polyol compound with
a polyisocyanate compound. In the present invention, the structure
of the polyurethane resin (B) is not particularly limited, but from
the viewpoint of blocking resistance, the glass transition
temperature must be 30.degree. C. or higher. From the viewpoint of
improvement in blocking resistance and the reliability of original
thread, the glass transition temperature is preferably 50.degree.
C. or higher, and particularly preferably 60.degree. C. or
higher.
[0080] The polyurethane resin (B) of the present invention
preferably has an anionic group from the viewpoint of mixing
performance with polyolefin resin (A). An anionic group is a
functional group that becomes an anion in an aqueous medium, for
example, a carboxyl group, a sulfonic group, a sulfate group, a
phosphate group, or the like. Among them, a carboxyl group is
preferred.
[0081] The polyol component of the polyurethane resin (B) is not
particularly limited, and examples thereof include water;
low-molecular-weight glycols, such as ethylene glycol, diethylene
glycol, triethylene glycol, 1,3-butanediol, 1,4-butanediol,
1,2-propanediol, 1,3-propanediol, 1,6-hexanediol, neopentyl glycol,
1,4-cyclohexane dimethanol, methyl-1,5-pentanediol, 1,8-octanediol,
2-ethyl-1,3-hexandiol, diethylene glycol, triethylene glycol, and
dipropylene glycol; low-molecular-weight polyols, such as
trimethylolpropane, glycerol, and pentaerythritol; polyol compounds
having an ethylene oxide unit or a propylene oxide unit;
high-molecular-weight diols, such as polyether diols and polyester
diols; bisphenols, such as bisphenol A and bisphenol F; dimer diols
resulting from conversion of carboxyl groups in a dimer acid into
hydroxyl groups; and the like.
[0082] As the polyisocyanate component, one kind of, or a mixture
of two or more kinds of publicly known aromatic, aliphatic, or
alicyclic diisocyanates can be used. Specific examples of the
diisocyanates include tolylene diisocyanate, 4,4'-diphenylmethane
diisocyanate, 1,3-phenylene diisocyanate, hexamethylene
diisocyanate, xylylene diisocyanate, 1,5-naphthylene diisocyanate,
isophorone diisocyanate, dimethyl diisocyanate, lysine
diisocyanate, hydrogenated 4,4'-diphenylmethane diisocyanate,
hydrogenated tolylene diisocyanate, dimer diisocyanate resulting
from conversion of carboxyl groups in a dimer acid into isocyanate
groups; adducts, biurets, and isocyanurates thereof; and the like.
The diisocyanates may be polyisocyanates having three or more
functional groups, such as triphenylmethane triisocyanate and
polymethylene polyphenyl isocyanate.
[0083] In order to introduce an anionic group into the polyurethane
resin (B), a polyol component having a carboxyl group, a sulfonic
group, a sulfate group, a phosphate group, or the like may be used.
Examples of the polyol compound having a carboxyl group include
3,5-dihydroxybenzoic acid, 2,2-bis(hydroxymethyl)propionic acid,
2,2-bis(hydroxyethyl)propionic)propionic acid,
2,2-bis(hydroxypropyl)propionic acid, bis(hydroxymethyl) acetic
acid, bis(4-hydroxyphenyl) acetic acid,
2,2-bis(4-hydroxyphenyl)pentanoic acid, tartaric acid,
N,N-dihydroxyethyl glycine, and N,N-bis(2-hydroxyethyl)-3-carboxyl
propionamide.
[0084] The molecular weight of the polyurethane resin (B) can also
be suitably adjusted with use of a chain extender. Examples of such
a compound include a compound having two or more active hydrogen
atoms, which are contained in, for example, in amino groups and
hydroxyl groups, capable of reacting with an isocyanate group; as
such a compound, diamine compounds, dihydrazide compounds, and
glycols can be used, for example.
[0085] Examples of the diamine compound include ethylenediamine,
propylenediamine, hexamethylenediamine, triethyl tetramine,
diethylenetriamine, isophoronediamine, and
dicyclohexylmethane-4,4'-diamine. In addition,
hydroxyl-group-containing diamines, such as N-2-hydroxyethyl
ethylenediamine and N-3-hydroxypropyl ethylenediamine; dimer
diamines resulting from conversion of carboxyl groups in a dimer
acid into amino groups; and the like are also included. Further,
diamine-type amino acids, such as glutamic acid, asparagine,
lysine, diaminopropionic acid, ornithine, diaminobenzoic acid, and
diaminobenzene sulfonic acid are also included.
[0086] Examples of the dihydrazide compound include saturated
aliphatic dihydrazides having 2 to 18 carbon atoms, such as oxalic
acid dihydrazide, malonic acid dihydrazide, succinic acid
dihydrazide, glutaric acid dihydrazide, adipic acid dihydrazide,
and sebacic acid dihydrazide; unsaturated dihydrazides, such as
maleic acid dihydrazide, fumaric acid dihydrazide, itaconic acid
dihydrazide, and phthalic acid dihydrazide; carbonic dihydrazide;
carbodihydrazide; thiocarbodihydrazide; and the like.
[0087] The glycol for use can be suitably selected from the
above-mentioned polyols.
[0088] In the present invention, the method for applying the
above-described resin comprising the polyolefin resin (A) and the
polyurethane resin (B) of which the glass transition point is
30.degree. C. or higher is not particularly limited. Examples of
the method include a method in which the resin is heated to a
temperature higher than the melting point and then directly
applied, dissolved in a solvent and applied, or applied as an
aqueous dispersion. Most preferred is, in the viewpoints of the
adjustment of the amount to be applied, and environmental effects,
the method of applying an aqueous dispersion.
[0089] For film performance (in particular water resistance) and
hygienic reasons, it is preferred that the aqueous dispersion is
substantially free from nonvolatile hydrophilizing agent. This is
because such a compound remains in a film even after film
formation, and leaks from the film or plasticizes the film,
deteriorating the performance of the film.
[0090] The "hydrophilizing agent" means an agent added in
production of the aqueous dispersion for the purpose of
facilitating hydrophilization and stabilizing the aqueous
dispersion. The "nonvolatile" means having no boiling point under
ordinary pressure, or having a high boiling point (for example, not
less than 300.degree. C.) under ordinary pressure. The
"substantially free from nonvolatile hydrophilizing agent" means
that since no nonvolatile hydrophilizing agent is positively added,
the resulting aqueous dispersion does not contain the agent.
Particularly preferred is that no nonvolatile hydrophilizing agent
is added, but addition of a nonvolatile hydrophilizing agent is
allowable as long as the content is less than 0.1% by mass relative
to the resin and the addition does not impair the effect of the
present invention.
[0091] Examples of the nonvolatile hydrophilizing agent include,
emulsifiers, compounds having a protective colloid action, modified
waxes, acid-modified compounds having a high acid number, water
soluble polymers, and the like, which will be described below.
[0092] Examples of the emulsifier include cationic emulsifiers,
anionic emulsifiers, nonionic emulsifiers, and amphoteric
emulsifiers. In addition to general emulsifiers used for emulsion
polymerization, surfactants are also included. Examples of the
anionic emulsifier include sulfates of higher alcohols, higher
alkyl sulfonates, higher carboxylates, alkylbenzene sulfonates,
polyoxyethylene alkyl sulfates, polyoxyethylene alkylphenyl ether
sulfates, and vinyl sulfosuccinates. Examples of the nonionic
emulsifier include compounds having a polyoxyethylene structure,
such as polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl
ethers, polyethylene glycol fatty acid esters, ethylene
oxide-propylene oxide block copolymers, polyoxyethylene fatty acid
amides, and ethylene oxide-propylene oxide copolymers; and sorbitan
derivatives, such as polyoxyethylene sorbitan fatty acid esters.
Examples of the amphoteric emulsifier include lauryl betaine, and
lauryldimethylamine oxide.
[0093] Examples of the compounds having a protective colloid
action, modified waxes, acid-modified compounds having a high acid
number, and water soluble polymers include compounds usually used
as dispersion stabilizer of fine particles. Such compounds include
polyvinyl alcohol, carboxyl-modified polyvinyl alcohol,
carboxymethyl cellulose, hydroxyethyl cellulose,
hydroxypropylcellulose, modified starch, polyvinyl pyrrolidone,
polyacrylic acid, and salts thereof; acid-modified polyolefin waxes
of which the number mean molecular weight is usually not more than
5,000, such as carboxyl group-containing polyethylene waxes,
carboxyl group-containing propylene waxes, carboxyl
group-containing polyethylene-propylene waxes, and salts thereof;
acrylic acid-maleic anhydride copolymers and salts thereof;
carboxyl group-containing polymers having 10% by mass or more of
unsaturated carboxylic acid, such as styrene (meth) acrylic acid
copolymers, ethylene-(meth)acrylic acid copolymers,
isobutylene-maleic anhydride alternating copolymers, and
(meth)acrylic acid-(meth)acrylic acid ester copolymers, and salts
thereof; polyitaconic acid and salts thereof; water-soluble acrylic
copolymers; gelatin; gum arabic; casein; and the like.
[0094] In the aqueous dispersion, it is preferred that carboxyl
groups (including acid anhydrides) of the polyolefin resin (A), and
anionic groups of the polyurethane resin (B) are partially
anionized. The electrostatic repulsive force of the anions prevents
resin particles from aggregating and stabilizes the aqueous
dispersion.
Method for Producing Aqueous Dispersion
[0095] The aqueous dispersion of the present invention may be
obtained by hydrophilizing the polyolefin resin (A) and the
polyurethane resin (B) as a mixture at the same time in a
container, or by mixing an aqueous dispersion of the polyolefin
resin (A) and an aqueous dispersion of the polyurethane resin (B)
at a desired ratio. The latter method is preferred. Hereafter, this
preferred method will be explained in detail.
Aqueous Dispersion of Polyolefin Resin (A)
[0096] The method for obtaining the aqueous dispersion of the
polyolefin resin (A) is not particularly limited, and as the
method, heating and stirring the polyolefin resin (A) and an
aqueous medium in a well-closable container may be adopted. The
shape of the resin to be hydrophilized is not particularly limited,
but for rapid hydrophilization, preferred is a granular or powder
resin having a particle diameter of 1 cm or less, preferably 0.8 cm
or less.
[0097] The container may be any container as long as the container
has a tank to which a liquid can be introduced and enables a
mixture of the introduced aqueous medium and the resin to be
appropriately stirred. For this purpose, apparatuses, such as a
solid/liquid mixer and an emulsifier widely known by those skilled
in the art maybe used, and an apparatus which can apply a pressure
of 0.1 MPa or higher is preferably used. The stirring method and
the rotational speed of the stirring are not particularly
limited.
[0098] After each introduced into the tank of the apparatus, the
raw materials are mixed with stirring preferably at a temperature
not higher than 40.degree. C. Next, while the temperature of the
tank is kept at 50 to 200.degree. C., preferably 60 to 200.degree.
C., stirring is continued for preferably 5 to 120 minutes so that
the resin can be sufficiently hydrophilized. By cooling the
hydrophilized resin to a temperature not higher than 40.degree. C.
preferably with stirring, an aqueous dispersion can be obtained.
When the temperature in the tank is less than 50.degree. C.,
hydrophilization of the resin is difficult. When the temperature in
the tank is higher than 200.degree. C., the molecular weight of the
polyolefin resin (A) may decrease.
[0099] At this time, for the reason described above, a basic
compound is preferably added in order to anionize the carboxyl
groups or the acid anhydride groups of the polyolefin resin (A).
The amount of the basic compound to be added is, relative to the
carboxyl group (1 mol of acid anhydride group is regarded as 2 mol
of carboxyl group) in the polyolefin resin (A), preferably 0.5 to
3.0 times equivalent, more preferably 0.8 to 2.5 times equivalent,
and particularly preferably 1.0 to 2.0 times equivalent. Less than
0.5 times equivalent of the basic compound does not show any
effect, and more than 3.0 times equivalent may prolong the drying
time in film formation and may color the aqueous dispersion.
[0100] Preferred examples of the basic compound to be added include
metal hydroxides, such as LiOH, KOH, and NaOH. From the viewpoint
of water resistance of the film, preferred are compounds which
volatilize during film formation, such as ammonia and various kinds
of organic amine compounds. The boiling point of such an organic
amine compound is preferably not higher than 250.degree. C. If the
boiling point is higher than 250.degree. C., the organic amine
compound hardly volatilizes while the resin film is drying, and the
water resistance of the film may deteriorate. The examples of the
organic amine compound include triethylamine,
N,N-dimethylethanolamine, aminoethanolamine,
N-methyl-N,N-diethanolamine, isopropylamine, iminobispropylamine,
ethylamine, diethylamine, 3-ethoxypropylamine,
3-diethylaminopropylamine, sec-butylamine, propylamine,
methylaminopropylamine, methyliminobispropylamine,
3-methoxypropylamine, monoethanolamine, diethanolamine,
triethanolamine, morpholine, N-methylmorpholine, N-ethylmorpholine,
and the like.
[0101] In the hydrophilization of the polyolefin resin (A), it is
preferred to add an organic solvent. The amount of the organic
solvent to be added is, relative to 100 parts by mass of the
aqueous dispersion, preferably 1 to 40 parts by mass, more
preferably 2 to 30 parts by mass, and particularly preferably 3 to
20 parts by mass. The organic solvent can be partially removed from
the system by heating of the aqueous dispersion with stirring under
ordinary pressure or reduced pressure (stripping), and thereby be
finally reduced to such a level that the ratio is not more than 1
part by mass relative to 100 parts by mass of the aqueous
dispersion of the polyolefin resin (A). Specific examples of the
organic solvent to be used include ethanol, n-propanol,
isopropanol, n-butanol, methylethylketone, cyclohexanone,
tetrahydrofuran, dioxane, ethyleneglycolmonoethylether,
ethyleneglycolmonopropylether, and ethyleneglycolmonobutylether.
From the viewpoint of low-temperature drying property, isopropanol
is particularly preferred.
Aqueous Dispersion of Polyurethane Resin (B)
[0102] The method for obtaining the aqueous dispersion of the
polyurethane resin (B) is not particularly limited. The
polyurethane resin (B) can be dispersed in an aqueous medium
according to the hydrophilization method for the polyolefin resin
(A) described above. Such aqueous dispersions of the polyurethane
resin (B) are commercially available, and examples thereof include
anionic products, such as Takerack W-615, W-6010, W-6020, W-6061,
W-511, W-405, W-7004, W-605, WS-7000, WS-5000, WS-5100, and
WS-4000; and nonionic products, such as Takerack W-512A6 and W-635,
manufactured by Mitsui Takeda Chemicals Inc.
[0103] By mixing the above-mentioned aqueous dispersion of the
polyolefin resin (A) and aqueous dispersion of the polyurethane
resin (B), an aqueous dispersion having a desired resin ratio can
be obtained.
[0104] From the viewpoint of improvement in the preservation
stability of the aqueous dispersion, the number mean particle
diameter (hereinafter, mn) of the resin particles in the aqueous
dispersion is preferably not more than 0.3 .mu.m, and from the
viewpoint of low-temperature film formability, more preferably not
more than 0.2 .mu.m, and most preferably less than 0.1 .mu.m. The
weight mean particle diameter (hereinafter, mw) is preferably not
more than 0.3 .mu.m, more preferably not more than 0.2 .mu.m.
Reducing the particle diameter improves the film formability at a
low temperature (for example, not higher than 100.degree. C., or
not higher than the melting point of the polyolefin resin (A)),
enabling the formation of a transparent film. From the viewpoints
of the preservation stability and the low-temperature film
formability of the aqueous dispersion, the degree of particle
dispersion (mw/mn) is preferably 1 to 3, more preferably 1 to 2.5,
and particularly preferably 1 to 2.
[0105] The resin content of the aqueous dispersion can be suitably
selected depending on the film-forming conditions, targeted
thickness or performance of the resin film, and the like, and is
not particularly limited. However, for appropriate viscosity and
favorable film formability of the coating composition, the resin
content is preferably 1 to 60% by mass, more preferably 3 to 55% by
mass, further preferably 5 to 50% by mass, and particularly
preferably 5 to 45% by mass.
[0106] In order to further improve various kinds of film
performances, such as water resistance and solvent resistance, a
crosslinking agent can be added in an amount of 0.01 to 60 parts by
mass, preferably 0.1 to 30 parts by mass relative to 100 parts by
mass of the total of the polyolefin resin (A) and the polyurethane
resin (B) in the aqueous dispersion. As for the crosslinking agent,
less than 0.01 part by mass does not sufficiently improve the film
performance, and more than 100 parts by mass deteriorates the
performance, for example, workability. Examples of the crosslinking
agent include self-crosslinking agents, compounds which have in a
molecule two or more functional groups capable of reacting with
carboxyl groups, and metals which have multiple coordination sites,
and among these, preferred are isocyanate compounds, melamine
compounds, urea compounds, epoxy compounds, carbodiimide compounds,
oxazoline-group-containing compounds, zirconium salt compounds,
silane coupling agents, and the like. These crosslinking agents may
be used in combination.
[0107] In addition, various kinds of agents, such as a leveling
agent, a defoaming agent, an antipopping agent, a pigment
dispersing agent, and an ultraviolet ray absorbing agent; and
pigments or dyes, such as titanium oxide, zinc oxide, and carbon
black, may be added to the aqueous dispersion as needed.
[0108] The resin comprising a polyolefin resin (A) and a
polyurethane resin (B) of which the glass transition point is
30.degree. C. or higher is described in, for example,
JP-A-2004-51661, and such a known method may be used. As the resin
comprising a polyolefin resin (A) and a polyurethane resin (B) of
which the glass transition point is 30.degree. C. or higher,
commercial products, such as Arrowbase (registered trademark, made
by Unitika Ltd.) may be used.
[0109] The adhesive resin used for the fishing line of the present
invention may contain metal particles. It is advantageous to
produce a fishing line with use of the adhesive resin containing
metal particles because the specific gravity of such a fishing line
can be set at any desired value, especially at a higher value,
regardless of the specific gravity of the adhesive resin. Examples
of the metal particles include particles of lead, iron, stainless
steel, aluminum, nickel, cobalt, chromium, manganese, molybdenum,
cadmium, copper, zinc, tin, silver, gold, platinum, palladium,
tungsten, titanium, and zirconium; alloys thereof; and oxides
thereof. Among them, preferred is tungsten, because addition of
even a small amount of tungsten effectively increases the specific
gravity, with minimum strength reduction of the fishing line. The
adhesive resin may contain one kind or two or more kinds of metal
particles.
[0110] These metal particles can be used in the form of powder or
granule in the present invention. The average diameter thereof is
preferably not more than about 20 .mu.m, more preferably not more
than about 10 .mu.m. When the particle diameter of the metal
particles is too large, total uniformity after mixing is poor. The
amount of the metal particles added to 100 parts by weight of the
adhesive resin is preferably about 1 to 90 parts by weight, more
preferably about 5 to 70 parts by weight. The adhesive resin
containing metal particles can be made by, as a method, melt
kneading of an adhesive resin and the metal particles with use of a
monoaxial or biaxial kneading machine.
[0111] Next, a method for producing the composite yarn constituting
the fishing line of the present invention will be described. The
composite yarn can be produced with use of a sheath yarn comprising
a long fiber for the sheath part and a core yarn comprising a short
fiber for the core part, and preferably produced by, for example,
the following method (I), (II), or (III). [0112] (I) A production
method comprising producing a composite yarn with use of a sheath
yarn comprising a long fiber for the sheath part and another long
fiber for the core yarn constituting the core part, the melting
point of the long fiber for the core yarn constituting the core
part being higher than that of the long fiber for the sheath yarn,
and drawing the composite yarn under heating to break the long
fiber in the core yarn into short fiber pieces without breaking the
long fiber in the sheath yarn. (In this case, the strength of the
long fiber for the core part is preferably lower than that of the
long fiber for the sheath part.) [0113] (II) A production method
comprising producing a composite yarn with use of a sheath yarn
comprising a long fiber for the sheath part and another long fiber
for the core yarn constituting the core part, the strength of the
long fiber for the core yarn constituting the core part being lower
than that of the long fiber for the sheath part, and drawing the
composite yarn under heating or without heating to break the long
fiber in the core yarn into short fiber pieces without breaking the
long fiber in the sheath yarn. [0114] (III) A production method
comprising producing a composite yarn with use of a sheath yarn
comprising a long fiber for the sheath part and a spun yarn
comprising a short fiber or staple for the core yarn constituting
the core part, the melting point of the short fiber or staple being
higher than that of the long fiber for the sheath part, and drawing
the composite yarn under heating or without heating to break the
spun yarn into short fiber pieces without breaking the long fiber
in the sheath part.
[0115] The composite yarn is produced by winding sheath yarns
comprising a long fiber around the core part constituted by a core
yarn so that the sheath yarn covers the core yarn, or braiding
sheath yarns comprising a long fiber around the core part
constituted by a core yarn. The core yarn is a yarn comprising the
above-mentioned long fiber or a spun yarn. In the case of a braided
yarn, the braiding angle is preferably 5.degree. to 90.degree.,
more preferably 5.degree. to 50.degree., and more preferably
20.degree. to 30.degree.. The method for braiding sheath yarns is
not particularly limited, but usually a braiding machine is used.
The number of sheath yarns used for braiding is not limited to 4
and in some cases may be 8, 12, 16, or the like. The braiding may
be round braiding or square braiding.
[0116] A composite yarn composed of a core part comprising a short
fiber and a sheath part comprising a synthetic fiber filament yarn
is drawn under heating or without heating, to give an integrated
yarn where fluff of the short fiber is entangled with the filament
(long fiber) so that the binding between the core and sheath layers
is strengthened and that the strength of the long fiber of the
sheath yarn constituting the sheath part is improved. Drawing under
heating is preferred. As the drawing temperature, a temperature
between the orientation temperature of the synthetic resin which
constitutes the long fiber of the sheath yarn and about the melting
point of the resin is adopted, depending on the material of the
long fiber. When the sheath yarn is constituted by a long fiber
comprising two or more kinds of synthetic resins, the drawing
temperature is suitably selected by experiment. Therefore, the
drawing temperature cannot be simply mentioned, but the temperature
of the long fiber in drawing is usually about 120 to 300.degree.
C., more preferably 130 to 200.degree. C., and most preferably 130
to 170.degree. C. The drawing rate varies with the types of the
short fiber and the long fiber, and the composition ratio in the
composite yarn, but is 1.05 to 10, preferably 1.2 to 8, and most
preferably 1.3 to 5. The drawing rate is the ratio of the take-over
speed to the feed speed of the yarn in drawing as represented by
the following formula:
drawing rate=(take-over speed)/(feed speed).
[0117] The drawing may be performed in one step or two or more
steps. Before drawing a composite yarn, an oil agent is provided to
the yarn. The method is not particularly limited, and publicly
known methods may be employed.
[0118] When the composite yarn is composed of a core part having a
core yarn made of a spun yarn and a sheath part having a sheath
yarn made of a synthetic long fiber, drawing treatment increases
the tensile strength of the filament constituting the sheath part
and strengthens the entanglement between the core and sheath
layers, giving a strong yarn excellent in abrasion resistance. In
drawing a composite yarn of which the core part comprises a staple
yarn, when a drawing rate is higher than a certain value as
described above, the staple yarn in the core part is partially and
irregularly broken to form a cotton-like material, giving a yarn
excellent in bendability and flexibility.
[0119] Hereafter, the method for integrating a core yarn and a
sheath yarn with use of an adhesive resin will be described.
[0120] In the method for producing the composite yarn constituting
the fishing line of the present invention described in the above
(I), (II), and (III), adopting the following method (i), (ii),
(iii), or (iv) enables production of a composite yarn having a core
yarn and a sheath yarn integrated with use of an adhesive resin.
[0121] (i) A composite yarn is produced by combining a core yarn
and a sheath yarn, an adhesive resin is applied to the composite
yarn or the composite yarn is impregnated with an adhesive resin,
and the composite yarn is drawn under heating. [0122] (ii) An
adhesive resin is applied to a sheath yarn or a sheath yarn is
impregnated with an adhesive resin, the sheath yarn is combined
with a core yarn to produce a composite yarn, and the composite
yarn is drawn under heating. [0123] (iii) An adhesive resin is
applied to a core yarn or a core yarn is impregnated with an
adhesive resin, the core yarn is combined with a sheath yarn to
produce a composite yarn, and the composite yarn is drawn under
heating. [0124] (iv) An adhesive resin is applied to each of the
sheath yarn and the core yarn, or each of the sheath yarn and the
core yarn is impregnated with an adhesive resin, a composite yarn
is produced by combining the sheath yarn and the core yarn, and the
composite yarn is drawn under heating.
[0125] Since excessive resin is squeezed out by the drawing, a
procedure for wiping off the excessive resin may be added in the
drawing step.
[0126] The core yarn and the sheath yarn may be ply yarns. The ply
yarn may be produced by simply paralleling two or more core yarns
or sheath yarns. The paralleled yarn may be additionally twisted if
desired. Alternatively, two or more core yarns or two or more
sheath yarns may be braided. The twisting can be easily performed
with a publicly known twisting machine, and the braiding can be
easily performed with a publicly known braiding machine.
[0127] The method for applying an adhesive resin to a core yarn, a
sheath yarn, or a composite yarn, or impregnating a core yarn, a
sheath yarn, or a composite yarn with an adhesive resin is not
particularly limited, and publicly known methods may be employed.
Specific examples of such a known method include dipping of one of
the yarns with use of a melting apparatus followed by optional
squeezing of excessive resin, application with use of spray etc.,
and extrusion coating with use of an extrusion coater.
Alternatively, publicly known applicators may be used. Examples of
such an applicator include an applicator having a nozzle gun
head.
[0128] The outermost layer of the thus obtained fishing line of the
present invention maybe coated with a resin. Coating the outermost
layer with a resin provides an advantage of smoothing the surface
of the fishing line and further improving the strength, water
absorption resistance, and abrasion resistance. Examples of the
resin used for coating include synthetic resins, such as
polypropylene, vinyl chloride, acrylic, urethane, nylon, polyester,
epoxy, vinyl acetate and ethylene-vinyl acetate resins, and the
synthetic resins maybe of an emulsion type or a solvent type. In
addition, natural rubber and synthetic rubber resin, such as SBR
can also be used. Among them, polypropylene is preferably used. For
the coating, publicly known methods may be preferably used, and
examples thereof include melt extrusion coating, and the like.
[0129] In the fishing line of the present invention, the short
fiber, the long fiber (filament), the adhesive resin, and the like
may additionally contain a colorant, a stabilizer, a plasticizer, a
thickener, a lubricant or the like, or two or more thereof, to the
extent that the objective of the present invention would not be
impaired.
EXAMPLES
[0130] Hereinafter, the present invention will be illustrated by
Examples, but it is not limited thereto.
[0131] The tensile strength in the Examples was determined by a
method according to JIS L 1013 "Testing methods for man-made
filament yarns" with a Strograph R tensile strength tester
manufactured by Toyo Seiki Seisaku-Sho, Ltd. The break elongation
was determined by a method according to JIS L 1013 "Testing methods
for man-made filament yarns" with a universal testing machine
"Autograph AG-100kNI" (manufactured by Shimadzu Corporation). The
fineness was determined according to JIS L 1013, Section 7.3. To
judge the break status of the core yarn, the entire yarn was cut at
right angle to the longitudinal direction, the core yarn was pulled
out from a cut surface, and whether a short piece of the core yarn
was obtained or not was observed. "Good" means that not the entire
core yarn but short pieces of the core yarn were pulled out (from a
cut surface) with some resistance, whereas "Poor" means that the
entire core yarn was easily pulled out in an unbroken state and
that the core and the sheath were easily separated.
Composite Yarn Production Example 1
An Adhesive Resin Was Applied to Sheath Yarns Before Braiding
Followed by Drawing Under Heating
[0132] A 66-d spun yarn made of a polyester staple (trade name:
Ester Spun Yarn E100FBN80/1C, manufactured by Unitika Fiber Co.,
Ltd.) was used as a core yarn.
[0133] A 75-d filament made of an ultra high molecular weight
polyethylene fiber (trade name: Dyneema SK71 85T-70-410,
manufactured by TOYOBO Co., Ltd.) was dipped in an aqueous
dispersion prepared by diluting an adhesive resin comprising a
polyolefin resin and a polyurethane resin of which the glass
transition point is 30.degree. C. or higher (Arrowbase SAW-1220,
manufactured by Unitika Ltd.) with water at a dilution ratio of 1:1
by mass, and then dried. The obtained yarn was used as a sheath
yarn.
[0134] Around a core yarn, eight sheath yarns were round braided.
The obtained yarn was drawn at a drawing rate of 1.0, 1.3, 1.5, or
1.8 at a drawing temperature of 140.degree. C. Excess resin was
squeezed out in the drawing.
[0135] The fineness, straight line strength, straight line break
elongation, knot strength, knot break elongation, and specific
gravity of the obtained yarn; and the break status of the core yarn
are shown in Table 1. As Table 1 clearly shows, at any drawing
rate, the core yarn was broken.
TABLE-US-00001 TABLE 1 Drawing rate 1.0 1.3 1.5 1.8 Fineness (dtex)
894 689 593 496 Break status Good Good Good Good Straight line
strength (N) 193.01 187.75 158.70 113.60 Straight line break
elongation (%) 6.9 5.2 3.8 3.3 Knot strength (N) 65.30 61.59 59.03
49.45 Knot break elongation (%) 3.2 3.0 2.2 1.8 Specific gravity
1.01 1.01 1.01 1.01
Composite Yarn Production Example 2
An Adhesive Resin Was Applied to a Core Yarn Before Braiding
Followed by Drawing Under Heating
[0136] A 66-d spun yarn made of a polyester staple (trade name:
Ester Spun Yarn E100FBN80/1C, manufactured by Unitika Fiber Co.,
Ltd.) was dipped in an aqueous dispersion prepared by diluting an
adhesive resin comprising a polyolefin resin and a polyurethane
resin of which the glass transition point is 30.degree. C. or
higher (Arrowbase SAW-1220, manufactured by Unitika Ltd.) with
water at a dilution ratio of 1:1 by mass, and then dried. The
obtained yarn was used as a core yarn.
[0137] A 75-d filament made of an ultra high molecular weight
polyethylene fiber (trade name: Dyneema SK71 85T-70-410,
manufactured by TOYOBO Co., Ltd.) was used as a sheath yarn.
[0138] Around a core yarn, eight sheath yarns were round braided.
The obtained yarn was drawn at a drawing rate of 1.0, 1.3, 1.5, or
1.8 at a drawing temperature of 140.degree. C. Excess resin was
squeezed out in the drawing.
[0139] The fineness, straight line strength, straight line break
elongation, knot strength, knot break elongation, and specific
gravity of the obtained yarn; and the break status of the core yarn
are shown in Table 2. As Table 2 clearly shows, at any drawing
rate, the core yarn was broken.
TABLE-US-00002 TABLE 2 Drawing rate 1.0 1.3 1.5 1.8 Fineness (dtex)
821 632 544 454 Break status Good Good Good Good Straight line
strength (N) 189.84 187.83 159.24 113.98 Straight line break
elongation (%) 6.7 5.0 3.6 3.2 Knot strength (N) 64.23 60.53 59.23
49.20 Knot break elongation (%) 3.2 2.9 2.4 1.8 Specific gravity
1.01 1.01 1.01 1.01
Composite Yarn Production Example 3
An Adhesive Resin Was Applied to a Core Yarn and Sheath Yarns
Before Braiding Followed by Drawing Under Heating
[0140] A 66-d spun yarn made of a polyester staple (trade name:
Ester Spun Yarn E100FBN80/1C, manufactured by Unitika Fiber Co.,
Ltd.) was dipped in an aqueous dispersion prepared by diluting an
adhesive resin comprising a polyolefin resin and a polyurethane
resin of which the glass transition point is 30.degree. C. or
higher (Arrowbase SAW-1220, manufactured by Unitika Ltd.) with
water at a dilution ratio of 1:1 by mass, and then dried. The
obtained yarn was used as a core yarn.
[0141] A 75-d filament made of an ultra high molecular weight
polyethylene fiber (trade name: Dyneema SK71 85T-70-410,
manufactured by TOYOBO Co., Ltd.) was dipped in an aqueous
dispersion prepared by diluting an adhesive resin comprising a
polyolefin resin and a polyurethane resin of which the glass
transition point is 30.degree. C. or higher (Arrowbase SAW-1220,
manufactured by Unitika Ltd.) with water at a dilution ratio of 1:1
by mass, and then dried. The obtained yarn was used as a sheath
yarn.
[0142] Around a core yarn, eight sheath yarns were round braided.
The obtained yarn was drawn at a drawing rate of 1.0, 1.3, 1.5, or
1.8 at a drawing temperature of 140.degree. C. Excess resin was
squeezed out in the drawing.
[0143] The fineness, straight line strength, straight line break
elongation, knot strength, knot break elongation, and specific
gravity of the obtained yarn; and the break status of the core yarn
are shown in Table 3. As Table 3 clearly shows, at any drawing
rate, the core yarn was broken.
TABLE-US-00003 TABLE 3 Drawing rate 1.0 1.3 1.5 1.8 Fineness (dtex)
897 690 594 497 Break status Good Good Good Good Straight line
strength (N) 192.67 186.48 158.92 114.62 Straight line break
elongation (%) 6.7 5.3 3.4 2.9 Knot strength (N) 65.42 62.61 59.82
49.63 Knot break elongation (%) 3.1 2.9 2.2 1.8 Specific gravity
1.01 1.01 1.01 1.01
Composite Yarn Production Example 4
An Adhesive Resin Was Applied to a Braided Composite Yarn Before
Drawing Under Heating
[0144] Around a 66-d spun yarn made of a polyester staple (trade
name: Ester Spun Yarn E100FBN80/1C, manufactured by Unitika Fiber
Co., Ltd.) as a core yarn, eight 75-d filaments made of an ultra
high molecular weight polyethylene fiber (trade name: Dyneema SK71
85T-70-410, manufactured by TOYOBO Co., Ltd.) were round braided
into a composite yarn.
[0145] The obtained composite yarn was dipped in an aqueous
dispersion prepared by diluting an adhesive resin comprising a
polyolefin resin and a polyurethane resin of which the glass
transition point is 30.degree. C. or higher (Arrowbase SAW-1220,
manufactured by Unitika Ltd.) with water at a dilution ratio of 1:1
by mass, and then drawn at a drawing rate of 1.0, 1.3, 1.5, or 1.8
at a drawing temperature of 140.degree. C. Excess resin was
squeezed out in the drawing.
[0146] The fineness, straight line strength, straight line break
elongation, knot strength, knot break elongation, and specific
gravity of the obtained yarn; and the break status of the core yarn
are shown in Table 4. As Table 4 clearly shows, at any drawing
rate, the core yarn was broken.
TABLE-US-00004 TABLE 4 Drawing rate 1.0 1.3 1.5 1.8 Fineness (dtex)
831 640 551 447 Break status Good Good Good Good Straight line
strength (N) 196.98 189.97 164.76 113.87 Straight line break
elongation (%) 6.6 4.9 3.8 3.2 Knot strength (N) 65.42 62.61 59.82
49.63 Knot break elongation (%) 3.0 2.8 2.1 1.7 Specific gravity
1.01 1.01 1.01 1.01
Composite Yarn Production Example 5
An Adhesive Resin Was Applied to a Braided Composite Yarn Before
Drawing Under Heating
[0147] Around a 630-d glass bulky yarn (trade name: TDE70,
manufactured by Unitika Glass Fiber Co., Ltd.) as a core yarn,
eight 200-d filaments made of an ultra high molecular weight
polyethylene fiber (trade name: Dyneema SK71 220T-192-410,
manufactured by TOYOBO Co., Ltd.) were round braided into a
composite yarn.
[0148] The obtained composite yarn was dipped in an aqueous
dispersion prepared by diluting an adhesive resin comprising a
polyolefin resin and a polyurethane resin of which the glass
transition point is 30.degree. C. or higher (Arrowbase SAW-1220,
manufactured by Unitika Ltd.) with water at a dilution ratio of 1:1
by mass, and then drawn at a drawing rate of 1.0, 1.2, 1.7, or 2.0
at a drawing temperature of 140.degree. C. Excess resin was
squeezed out in the drawing.
[0149] The fineness, straight line strength, straight line break
elongation, knot strength, knot break elongation, and specific
gravity of the obtained yarn; and the break status of the core yarn
are shown in Table 5. As Table 5 clearly shows, at any drawing
rate, the core yarn was broken.
TABLE-US-00005 TABLE 5 Drawing rate 1.0 1.2 1.7 2.0 Fineness (dtex)
2736 2301 1641 1406 Break status Good Good Good Good Straight line
strength (N) 278.51 283.80 252.82 235.36 Straight line break
elongation (%) 8.8 5.0 3.5 2.8 Knot strength (N) 145.24 146.12
115.33 90.52 Knot break elongation (%) 6.8 4.6 2.6 2.0 Specific
gravity 1.17 1.17 1.17 1.17
Composite Yarn Production Example 6
An Adhesive Resin Was Applied to a Braided Composite Yarn Before
Drawing Under Heating
[0150] Around a 203-d glass filament yarn (trade name: Glass Yarn
D450 1/2 4.4S, manufactured by Unitika Glass Fiber Co., Ltd.) as a
core yarn, eight 200-d filaments made of an ultra high molecular
weight polyethylene fiber (trade name: Dyneema SK71 220T-192-410,
manufactured by TOYOBO Co., Ltd.) were round braided into a
composite yarn.
[0151] The obtained composite yarn was dipped in an aqueous
dispersion prepared by diluting an adhesive resin comprising a
polyolefin resin and a polyurethane resin of which the glass
transition point is, 30.degree. C. or higher (Arrowbase SAW-1220,
manufactured by Unitika Ltd.) with water at a dilution ratio of 1:1
by mass, and then drawn at a drawing rate of 1.0, 1.3, 1.5, or 1.8
at a drawing temperature of 140.degree. C. Excess resin was
squeezed out in the drawing.
[0152] The fineness, straight line strength, straight line break
elongation, knot strength, knot break elongation, and specific
gravity of the obtained yarn; and the break status of the core yarn
are shown in Table 6. As Table 6 clearly shows, in the case where a
glass yarn (long fiber) was used as a core yarn and a long fiber
was used for braiding as a sheath part, the core yarn was not
broken at a drawing rate of 1.0, but broken when drawn at a rate of
1.3 or more.
[0153] The yarn drawn at 1.5 had a higher knot strength, despite
the lower fineness, than the yarn drawn at 1.3. The reason is
considered to be that the glass yarn in the core part was drawn at
a higher rate and favorably broken.
TABLE-US-00006 TABLE 6 Drawing rate 1.0 1.3 1.5 1.8 Fineness (dtex)
2356 1793 1573 1297 Break status Poor Good Good Good Straight line
strength (N) 408.00 304.87 328.78 268.57 Straight line break
elongation (%) 4.8 3.8 3.0 2.4 Knot strength (N) 129.65 84.67 98.45
98.23 Knot break elongation (%) 3.2 2.8 2.4 2.1 Specific gravity
1.05 1.05 1.05 1.05
Composite Yarn Production Example 7
[0154] Around a 396-d fluororesin filament (trade name: Hastex
FEP440dT/48f, manufactured by TOYO POLYMER Co., Ltd.) as a core
yarn, eight 100-d filaments made of an ultra high molecular weight
polyethylene fiber (trade name: Dyneema SK71 110T-96-410,
manufactured by TOYOBO Co., Ltd.) were round braided into a
composite yarn.
[0155] The obtained composite yarn was dipped in an aqueous
dispersion prepared by diluting an adhesive resin comprising a
polyolefin resin and a polyurethane resin of which the glass
transition point is 30.degree. C. or higher (Arrowbase SAW-1220,
manufactured by Unitika Ltd.) with water at a dilution ratio of 1:1
by mass, and then drawn at a drawing rate of 1.0, 1.3, 1.5, or 1.8
at a drawing temperature of 140.degree. C. Excess resin was
squeezed out in the drawing.
[0156] The fineness, straight line strength, straight line break
elongation, knot strength, knot break elongation, and specific
gravity of the obtained yarn; and the break status of the core yarn
are shown in Table 7. As Table 7 clearly shows, in the case where a
fluororesin filament (long fiber) was used as a core yarn and a
long fiber was used for braiding as a sheath part, the core yarn
was not broken at a drawing rate of 1.0, but broken when drawn at a
rate of 1.3 or more.
TABLE-US-00007 TABLE 7 Drawing rate 1.0 1.3 1.5 1.8 Fineness (dtex)
1489 1133 994 820 Break status Poor Good Good Good Straight line
strength (N) 220.62 193.89 168.93 141.11 Straight line break
elongation (%) 6.6 3.7 3.1 2.9 Knot strength (N) 71.10 61.28 60.08
47.73 Knot break elongation (%) 3.2 2.8 2.2 1.8 Specific gravity
1.18 1.18 1.18 1.18
* * * * *