U.S. patent application number 13/535939 was filed with the patent office on 2012-10-18 for thermoplastic resin composition and molded product using the same.
This patent application is currently assigned to Cheil Industries Inc.. Invention is credited to Jin-Kyung CHO, Doo-Han HA, Young-Chul KWON, Hyung-Tak LEE.
Application Number | 20120264869 13/535939 |
Document ID | / |
Family ID | 44918837 |
Filed Date | 2012-10-18 |
United States Patent
Application |
20120264869 |
Kind Code |
A1 |
LEE; Hyung-Tak ; et
al. |
October 18, 2012 |
Thermoplastic Resin Composition and Molded Product Using the
Same
Abstract
Provided are a thermoplastic resin composition including a
thermoplastic resin and a metal particle obtained by punching that
has a ratio of thickness relative to long diameter of about 1:7 to
about 1:1, and a molded product using the same.
Inventors: |
LEE; Hyung-Tak; (Uiwang-si,
KR) ; HA; Doo-Han; (Uiwang-si, KR) ; CHO;
Jin-Kyung; (Uiwang-si, KR) ; KWON; Young-Chul;
(Uiwang-si, KR) |
Assignee: |
Cheil Industries Inc.
Gumi-si
KR
|
Family ID: |
44918837 |
Appl. No.: |
13/535939 |
Filed: |
June 28, 2012 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/KR2010/008596 |
Dec 2, 2010 |
|
|
|
13535939 |
|
|
|
|
Current U.S.
Class: |
524/441 |
Current CPC
Class: |
C08K 3/08 20130101; C08K
7/02 20130101; C08L 69/00 20130101; C08L 55/02 20130101; C08L
101/00 20130101; C08K 3/40 20130101; C08J 5/00 20130101 |
Class at
Publication: |
524/441 |
International
Class: |
C08L 15/00 20060101
C08L015/00; C08K 3/08 20060101 C08K003/08; C08K 3/40 20060101
C08K003/40 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 31, 2009 |
KR |
10-2009-0135999 |
Jun 10, 2010 |
KR |
10-2010-0054950 |
Claims
1. A thermoplastic resin composition, comprising a thermoplastic
resin; and a metal particle obtained by punching that has a ratio
of thickness relative to long diameter of about 1:7 to about
1:1.
2. The thermoplastic resin composition of claim 1, wherein the
thermoplastic resin composition further comprises an inorganic
particle.
3. The thermoplastic resin composition of claim 1, wherein the
thermoplastic resin comprises a polycarbonate resin, a rubber
modified vinyl-based copolymer resin, a polyester resin, a
polyalkyl(meth)acrylate resin, or a combination thereof.
4. The thermoplastic resin composition of claim 1, wherein the
metal particle obtained by punching is made of a material including
aluminum, copper, gold, or a combination thereof.
5. The thermoplastic resin composition of claim 1, wherein the
metal particle obtained by punching has a ratio of thickness
relative to long diameter of about 1:5 to about 1:2.
6. The thermoplastic resin composition of claim 1, comprising the
metal particle obtained by punching in an amount of about 0.01 to
about 10 parts by weight based on about 100 parts by weight of the
thermoplastic resin.
7. The thermoplastic resin composition of claim 2, wherein the
inorganic particle comprises a glass particle, mica, graphite, a
pearl particle, or a combination thereof.
8. The thermoplastic resin composition of claim 2, wherein the
inorganic particle has a long diameter of about 10 to about 200
.mu.m, and a thickness of about 0.5 to about 10 .mu.m.
9. The thermoplastic resin composition of claim 2, comprising the
inorganic particle in an amount of about 0.01 to about 10 parts by
weight based on about 100 parts by weight of the thermoplastic
resin.
10. The thermoplastic resin composition of claim 2, wherein the
metal particle obtained by punching and the inorganic particle are
mixed in a weight ratio of about 1:5 to about 5:1.
11. A molded product fabricated using the thermoplastic resin
composition of claim 1.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation-in-part of International
Application No. PCT/KR2010/008596, filed Dec. 2, 2010, pending,
which designates the U.S. published as WO 2011/081304, and is
incorporated herein by reference in its entirety, and claims
priority therefrom under 35 USC Section 120. This application also
claims priority under 35 USC Section 119 from Korean Patent
Application No. 10-2009-0135999, filed Dec. 31, 2009, and Korean
Patent Application No. 10-2010-0054950, filed Jun. 10, 2010, in the
Korean Intellectual Property Office, the entire disclosure of each
of which is also incorporated herein by reference.
FIELD
[0002] This disclosure relates to a thermoplastic resin composition
having excellent appearance and a molded product using the
same.
BACKGROUND
[0003] Recently, plastic exterior products with diverse colors are
becoming increasingly popular for electronic parts, automobile
parts and the like, and for plastic exterior products with a high
quality sense of touch.
[0004] Plastic exterior products usually include a plastic resin
and a metal to give the appearance of a metal-like texture to the
resin, such as discussed in Japanese Patent Laid-Open Publication
Nos. 2001-262003 and 2007-137963. The metal-like texture, however,
did not appear in an actual experiment, and there is a problem in
that a flow mark or a weld line is formed during an injection
process.
[0005] Japanese Patent Laid-Open Publication No. 1995-196901 gives
a metal-like texture by adding a metal microplate to a plastic
resin. The metal microplate is obtained by a punching process and
has the luster of an average shape ratio (thickness/average
particle diameter) of 1/100 to 1/8. This technology, however, also
has limitations such as formation of weld line.
SUMMARY
[0006] One embodiment provides a thermoplastic resin composition
that can have excellent impact resistance, may not form a flow mark
and/or a weld line, and can have the appearance of a metal-like
texture.
[0007] Another embodiment provides a molded product using the
thermoplastic resin composition.
[0008] The thermoplastic resin composition can include a
thermoplastic resin; and a metal particle obtained by punching that
has a ratio of a thickness relative to a long diameter of about 1:7
to about 1:1.
[0009] The thermoplastic resin composition may further include an
inorganic particle.
[0010] Examples of the thermoplastic resin may include without
limitation polycarbonate resins, rubber modified vinyl-based
copolymer resins, polyester resins, polyalkyl(meth)acrylate resins,
and the like, and combinations thereof.
[0011] The metal particle obtained by punching may be made of a
material including aluminum, copper, gold, or a combination
thereof.
[0012] The metal particle obtained by punching may have a ratio of
a thickness relative to a long diameter of about 1:5 to about
1:2.
[0013] The thermoplastic resin composition may include the metal
particle obtained by punching in an amount of about 0.01 to about
10 parts by weight based on about 100 parts by weight of the
thermoplastic resin.
[0014] The inorganic particle may include a glass particle, mica,
graphite, a pearl particle, or a combination thereof.
[0015] The inorganic particle may have a long diameter of about 10
to about 200 .mu.m, and a thickness of about 0.5 to about 10
.mu.m.
[0016] The thermoplastic resin composition may include the
inorganic particle in an amount of about 0.01 to about 10 parts by
weight based on about 100 parts by weight of the thermoplastic
resin.
[0017] The metal particle obtained by punching and the inorganic
particle may be mixed in a weight ratio of about 1:5 to about
5:1.
[0018] According to another embodiment, a molded product fabricated
using the thermoplastic resin composition is provided.
[0019] The thermoplastic resin composition can have excellent
impact resistance, may form minimal or no flow marks and/or weld
lines, and can have an excellent appearance with a metal-like
texture. Accordingly, the thermoplastic resin composition may be
used in molded products that can have an excellent appearance, such
as plastic exterior products including electronic parts, automobile
parts, and the like, even without a painting process.
DETAILED DESCRIPTION
[0020] The present invention will be described more fully
hereinafter in the following detailed description of the invention,
in which some but not all embodiments of the invention are
described. Indeed, this invention may be embodied in many different
forms and should not be construed as limited to the embodiments set
forth herein; rather, these embodiments are provided so that this
disclosure will satisfy applicable legal requirements.
[0021] When a specific definition is not otherwise provided, the
term "(meth)acrylate" refers to "acrylate" and "methacrylate".
"(Meth)acrylic acid alkyl ester" refers to both "acrylic acid alkyl
ester" and "methacrylic acid alkyl ester", and "(meth)acrylic acid
ester" refers to both "acrylic acid ester" and "methacrylic acid
ester".
[0022] Unless otherwise mentioned in the present specification, a
"long diameter" denotes the length of a line connecting two points
in a closed curved, and the "closed curve" is a curved line where a
point moves in one direction and returns to the departure
point.
[0023] A thermoplastic resin composition according to one
embodiment includes a thermoplastic resin and a metal particle
obtained by punching and having a ratio of thickness relative to
long diameter of about 1:7 to about 1:1, and may further include an
inorganic particle.
[0024] Each component included in the thermoplastic resin
composition according to embodiments of the present invention will
hereinafter be described in detail.
[0025] (A) Thermoplastic Resin
[0026] Examples of the thermoplastic resin may include without
limitation polycarbonate resins, rubber modified vinyl-based
copolymer resins, polyester resins, polyalkyl(meth)acrylate resins,
and the like, and combinations thereof. The thermoplastic resin may
provide basic properties such as impact resistance, heat
resistance, flexural characteristics, tensile characteristics, and
the like.
[0027] The polycarbonate resin may be prepared by reacting one or
more diphenols with a compound such as a phosgene, halogen formate,
carbonate ester, or a combination thereof.
[0028] Examples of the diphenols include without limitation
hydroquinone, resorcinol, 4,4'-dihydroxydiphenyl,
2,2-bis(4-hydroxyphenyl)propane (referred to as "bisphenol-A"),
2,4-bis(4-hydroxyphenyl)-2-methylbutane, bis
(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)cyclohexane,
2,2-bis (3-chloro-4-hydroxyphenyl)propane, 2,2-bis
(3,5-dimethyl-4-hydroxyphenyl)propane, 2,2-bis
(3,5-dichloro-4-hydroxyphenyl)propane, 2,2-bis
(3,5-dibromo-4-hydroxyphenyl)propane,
bis(4-hydroxyphenyl)sulfoxide, bis (4-hydroxyphenyl)ketone,
bis(4-hydroxyphenyl)ether, and the like, and combinations thereof.
In exemplary embodiments, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis
(3,5-dichloro-4-hydroxyphenyl)propane, or 1,1-bis
(4-hydroxyphenyl)cyclohexane may be used, for example 2,2-bis
(4-hydroxyphenyl)propane may be used.
[0029] The polycarbonate resin may have a weight average molecular
weight of about 10,000 to about 200,000 g/mol, for example about
15,000 to about 80,000 g/mol, but is not limited thereto.
[0030] The polycarbonate resin may be a mixture of copolymers
obtained using two or more dipenols that differ from each other.
The polycarbonate resin may include a linear polycarbonate resin, a
branched polycarbonate resin, a polyestercarbonate copolymer resin,
and the like, as well as combinations thereof.
[0031] The linear polycarbonate resin may include a
bisphenol-A-based polycarbonate resin. The branched polycarbonate
resin may be produced by reacting a multi-functional aromatic
compound such as trimellitic anhydride, trimellitic acid, and the
like with one or more diphenols and a carbonate. The
multi-functional aromatic compound may be included in an amount of
about 0.05 to about 2 mol % based on the total weight of the
branched polycarbonate resin. The polyester carbonate copolymer
resin may be produced by reacting difunctional carboxylic acid with
one or more diphenols and a carbonate. The carbonate may include a
diaryl carbonate such as diphenyl carbonate, ethylene carbonate,
and the like.
[0032] The rubber modified vinyl-based copolymer resin is a
copolymer wherein about 5 to about 95 wt % of a vinyl-based polymer
is grafted on about 5 to about 95 wt % of a rubbery polymer.
[0033] In some embodiments, the rubber modified vinyl-based
copolymer resin may include a rubbery polymer in an amount of about
5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56,
57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73,
74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90,
91, 92, 93, 94, or 95 wt %. Further, according to some embodiments
of the present invention, the amount of the rubbery polymer can be
in a range from about any of the foregoing amounts to about any
other of the foregoing amounts.
[0034] In some embodiments, the rubber modified vinyl-based
copolymer resin may include a vinyl-based polymer in an amount of
about 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54,
55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71,
72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88,
89, 90, 91, 92, 93, 94, or 95 wt %. Further, according to some
embodiments of the present invention, the amount of the vinyl-based
polymer can be in a range from about any of the foregoing amounts
to about any other of the foregoing amounts.
[0035] The vinyl-based polymer may be a polymer of about 50 to
about 95 wt % of a first vinyl-based monomer including an aromatic
vinyl monomer, an acrylic-based monomer, a heterocyclic monomer, or
a combination thereof; and about 5 to about 50 wt % of a second
vinyl-based monomer including an unsaturated nitrile monomer, an
acrylic-based monomer, a hetero cyclic monomer, or a combination
thereof.
[0036] In some embodiments, the vinyl-based polymer may include a
first vinyl-based monomer in an amount of about 50, 51, 52, 53, 54,
55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71,
72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88,
89, 90, 91, 92, 93, 94, or 95 wt %. Further, according to some
embodiments of the present invention, the amount of the first
vinyl-based monomer can be in a range from about any of the
foregoing amounts to about any other of the foregoing amounts.
[0037] In some embodiments, the vinyl-based polymer may include a
second vinyl-based monomer in an amount of about 5, 6, 7, 8, 9, 10,
11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44,
45, 46, 47, 48, 49, or 50 wt %. Further, according to some
embodiments of the present invention, the amount of the second
vinyl-based monomer can be in a range from about any of the
foregoing amounts to about any other of the foregoing amounts.
[0038] Examples of the aromatic vinyl monomer may include without
limitation styrene, C1 to C10 alkyl-substituted styrene,
halogen-substituted styrene, and the like, and combinations
thereof. Examples of the alkyl-substituted styrene may include
without limitation o-ethyl styrene, m-ethyl styrene, p-ethyl
styrene, .alpha.-methyl styrene, and the like, and combinations
thereof.
[0039] Examples of the acrylic-based monomer may include without
limitation (meth)acrylic acid alkyl esters, (meth)acrylic acid
esters, and the like, and combinations thereof. As used herein, the
alkyl may be a C1 to C10 alkyl. Examples of the (meth)acrylic acid
alkyl ester may include without limitation methyl(meth)acrylate,
ethyl(meth)acrylate, propyl(meth)acrylate, butyl(meth)acrylate, and
the like, and combinations thereof. In exemplary embodiments
methyl(meth)acrylate may be used. Examples of the (meth)acrylic
acid ester may include without limitation (meth)acrylate, and the
like.
[0040] Examples of the heterocyclic monomer may include without
limitation maleic anhydride, C1-C10 alkyl- or phenyl N-substituted
maleimide, and the like, and combinations thereof.
[0041] Examples of the unsaturated nitrile monomer may include
without limitation acrylonitrile, methacrylonitrile,
ethacrylonitrile, and the like, and combinations thereof.
[0042] Examples of the rubbery polymer may include without
limitation butadiene rubbers, acrylic rubbers, ethylene/propylene
rubbers, styrene/butadiene rubbers, acrylonitrile/butadiene
rubbers, isoprene rubbers, ethylene-propylene-diene terpolymer
(EPDM) rubbers, polyorganosiloxane/polyalkyl(meth)acrylates, rubber
composites, and the like, and combinations thereof.
[0043] When the rubber modified vinyl-based copolymer is prepared,
a rubber particle may have a particle diameter of about 0.05 to
about 4 .mu.m to improve the impact resistance and surface
characteristics of a molded product, and when the particle diameter
of the rubber particle ranges from about 0.05 to about 4 .mu.m,
excellent impact strength may be secured.
[0044] The rubber modified vinyl-based copolymer may be used
singularly or as a mixture of two or more.
[0045] The rubber modified vinyl-based copolymer may include
styrene, acrylonitrile, and optionally methyl(meth)acrylate
graft-copolymerized on a butadiene rubber, an acrylic rubber, or a
styrene/butadiene rubber as a mixture.
[0046] The rubber modified vinyl-based copolymer may include
methyl(meth)acrylate graft-copolymerized on a butadiene rubber, an
acrylic rubber, or a styrene/butadiene rubber.
[0047] The rubber modified vinyl-based copolymer may include an
acrylonitrile-butadiene-styrene graft copolymer.
[0048] The method of preparing the rubber modified vinyl-based
copolymer is widely known to those skilled in the art, and any
method among emulsion polymerization, suspension polymerization,
solution polymerization and mass (bulk) polymerization may be used.
Emulsion polymerization or mass polymerization can be conducted by
adding the aforementioned aromatic vinyl monomer to a rubbery
polymer and using a polymerization initiator.
[0049] The polyester resin can be an aromatic polyester resin, and
it may be a condensation-polymerized resin obtained from melt
polymerization of terephthalic acid or alkyl ester terephthalate,
and a C2 to C10 glycol component. As used herein with reference to
the alkyl ester terephthalate, the alkyl may be a C1 to C10
alkyl.
[0050] Examples of the aromatic polyester resin may include without
limitation polyethylene terephthalate resins, polytrimethylene
terephthalate resins, polybutylene terephthalate resins,
polyhexamethylene terephthalate resins, polycyclohexane dimethylene
terephthalate resins, one of the foregoing polyester resins
modified into a non-crystalline resin by mixing the resin with
another monomer, and the like, and combinations thereof. In
exemplary embodiments, the aromatic polyester can be a polyethylene
terephthalate resin, a polytrimethylene terephthalate resin, a
polybutylene terephthalate resin, and/or a non-crystalline
polyethylene terephthalate resin, for example a polybutylene
terephthalate resin and/or a polyethylene terephthalate resin may
be used.
[0051] The polybutylene terephthalate resin is a
condensation-polymerized polymer obtained through a direct ester
reaction or an ester exchange reaction of 1,4-butanediol, and
terephthalic acid or dimethyl terephthalate monomer.
[0052] To increase the impact strength of the polybutylene
terephthalate resin, the polybutylene terephthalate resin may be
copolymerized with polytetramethylene glycol (PTMG), polyethylene
glycol (PEG), polypropylene glycol (PPG), a low molecular-weight
aliphatic polyester, or aliphatic polyamide. Also the polybutylene
terephthalate resin it may be used in the form of a modified
polybutylene terephthalate resin obtained by blending with a
component improving impact strength.
[0053] The polybutylene terephthalate resin may have an intrinsic
viscosity [n] of about 0.35 to about 1.5 dl/g, for example about
0.5 to about 1.3 dl/g in o-chloro phenol at 25.degree. C. When the
polybutylene terephthalate resin has an intrinsic viscosity [.eta.]
within the above range, the polybutylene terephthalate resin may
have excellent mechanical strength and formability.
[0054] The polyalkyl(meth)acrylate resin may be obtained by
polymerizing a monomer material including an alkyl(meth)acrylate
using a known polymerization method, such as a suspension
polymerization method, a mass polymerization method, an emulsion
method and the like.
[0055] The alkyl(meth)acrylate may have a C1 to C10 alkyl group.
Examples of the alkyl(meth)acrylate may include without limitation
methyl(meth)acrylate, ethyl(meth)acrylate, butyl(meth)acrylate,
glycidyl(meth)acrylate, hydroxyethyl(meth)acrylate, and the like,
and combinations thereof.
[0056] The alkyl(meth)acrylate may be included in an amount of
greater than or equal to about 50 wt % based on the total amount
(weight) of the polyalkyl(meth)acrylate. In some embodiments, the
polyalkyl(meth)acrylate resin may include an alkyl(meth)acrylate in
an amount of about 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,
62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78,
79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
96, 97, 98, 99, or 100 wt %. Further, according to some embodiments
of the present invention, the amount of the alkyl(meth)acrylate can
be in a range from about any of the foregoing amounts to about any
other of the foregoing amounts.
[0057] The polyalkyl(meth)acrylate may have a weight average
molecular weight of about 10,000 to about 200,000 g/mol, for
example about 15,000 to about 150,000 g/mol. When the
polyalkyl(meth)acrylate has a weight average molecular weight
within the above range, hydrolysis resistance, scratch resistance,
workability, and the like may be improved.
[0058] (B) Metal Particle Obtained by Punching
[0059] The metal particle obtained by punching may provide the
thermoplastic resin with a metal-like texture.
[0060] The metal particle obtained by punching may be a kind of a
sparkling particle having a flat surface reflecting light. As used
herein, the flat surface is a flat surface that the glittering of
particles may be seen with the naked eye, for example, the flat
surface refers to the surface of sheet glass or a polished metal
surface.
[0061] The metal particle obtained by punching refers to a metal
particle cut in a uniform or regular shape, and it is distinguished
from an inorganic particle which can have a relatively irregular
shape.
[0062] The metal particle obtained by punching may be made of a
material including aluminum, copper, gold, or a combination
thereof. In exemplary embodiments, the metal particle may include
aluminum.
[0063] The metal particle obtained by punching may have a ratio of
a thickness relative to a long diameter of about 1:7 to about 1:1,
for example about 1:5 to about 1:2.
[0064] As used herein, the term "thickness" refers to the height
dimension of the metal particle obtained by punching, and the term
"long diameter" refers to the length dimension (the longest
dimension) of the metal particle obtained by punching. The skilled
artisan will appreciate that the metal particle obtained by
punching does not necessarily have precise or exact dimensions but
that the metal particle obtained by punching can have variations or
deviations in the shape thereof.
[0065] When the metal particle obtained by punching has a ratio of
thickness relative to long diameter range within the above range, a
molded product having minimal or no flow marks and/or weld lines
and excellent metal-like texture may be provided.
[0066] The metal particle obtained by punching may have a long
diameter of about 10 to about 150 .mu.m, and may have a
cross-sectional area of about 100 to about 22,500 .mu.m.sup.2. When
the metal particle obtained by punching has a long diameter and
cross-sectional area within the above range, a molded product
having minimal or no flow marks and/or weld lines and excellent
metal-like texture may be provided.
[0067] The thermoplastic resin composition may include the metal
particle obtained by punching in an amount of about 0.01 to about
10 parts by weight, for example about 0.05 to about 1 parts by
weight, based on about 100 parts by weight of the thermoplastic
resin. In some embodiments, the thermoplastic resin composition may
include the metal particle obtained by punching in an amount of
about 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1,
0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9,
or 10 parts by weight. Further, according to some embodiments of
the present invention, the amount of the metal particle obtained by
punching can be in a range from about any of the foregoing amounts
to about any other of the foregoing amounts.
[0068] When the metal particle obtained by punching is used in an
amount within the above range, a molded product having excellent
impact strength, having minimal or no flow marks and/or weld lines,
and having excellent metal-like texture may be obtained.
[0069] (C) Inorganic Particle
[0070] The thermoplastic resin composition may further include the
inorganic particle.
[0071] The inorganic particle may be another kind of sparkling
particle having a flat surface reflecting light, which is different
from the metal particle obtained by punching. As used herein, the
flat surface is the same as described above.
[0072] Examples of the inorganic particle may include without
limitation glass particles, mica, graphite, pearl particles, and
the like, and combinations thereof. In exemplary embodiments, the
inorganic particle may include a glass particle.
[0073] The glass particle can have a sheet structure, and
accordingly, the glass particle is different from a glass fiber
which usually has a cylindrical shape. The glass fiber having a
cylindrical shape does not reflect light and thus it does not
significantly impart a metal-like texture. The glass particle may
have circular, oval, and amorphous cross-sectional surfaces.
[0074] The inorganic particle may have a long diameter of about 10
to about 200 .mu.m, a thickness of about 0.5 to about 10 .mu.m, and
a cross-sectional area of about 80 to about 32,000 .mu.m.sup.2.
[0075] As used herein, the term "thickness" refers to the height
dimension of the inorganic particle, and the term "long diameter"
refers to the length dimension (the longest dimension) of the
inorganic particle.
[0076] When the inorganic particle has a long diameter, thickness,
and cross-sectional area within the above ranges, a molded product
having minimal or no flow marks and/or weld lines and having
excellent metal-like texture may be provided.
[0077] The thermoplastic resin composition may include the
inorganic particle in an amount of about 0.01 to about 10 parts by
weight, for example about 0.05 to about 10 parts by weight, based
on about 100 parts by weight of the thermoplastic resin. In some
embodiments, the thermoplastic resin composition may include the
inorganic particle in an amount of about 0.01, 0.02, 0.03, 0.04,
0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7,
0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 parts by weight.
Further, according to some embodiments of the present invention,
the amount of the inorganic particle can be in a range from about
any of the foregoing amounts to about any other of the foregoing
amounts.
[0078] When the inorganic particle is included in an amount within
the above range, a molded product having excellent impact strength,
minimal or no flow marks and/or welds line, and excellent
metal-like texture may be obtained.
[0079] The metal particle obtained by punching (B) and the
inorganic particle (C) may be mixed in a weight ratio of about 1:5
to about 5:1, and for example about 1:2 to about 2:1 in the
thermoplastic resin composition. When the metal particle obtained
by punching (B) and the inorganic particle (C) are mixed in a
weight ratio within the above range, impact strength can be
improved, and a molded product that can have excellent impact
strength, minimal or no flow marks and/or weld lines, and excellent
metal-like texture may be obtained.
[0080] (D) Other Additive(s)
[0081] The thermoplastic resin composition according to one
embodiment can include one or more additives. Examples of the
additives include without limitation antibacterial agents, heat
stabilizers, antioxidants, release agents, light stabilizers,
surfactants, coupling agents, plasticizers, admixtures, colorants,
stabilizers, lubricants, antistatic agents, coloring aids, flame
proofing agents, weather-resistance agents, ultraviolet (UV)
absorbers, ultraviolet (UV) blocking agents, nucleating agents,
adhesion aids, adhesives, and the like, and combinations
thereof.
[0082] Examples of the antioxidant may include without limitation
phenol antioxidants, phosphite antioxidants, thioether
antioxidants, amine antioxidants, and the like, and combinations
thereof. Examples of the release agent may include without
limitation fluorine-included polymers, silicone oils, a stearic
metal salts, montanic metal salts, montanic ester waxes,
polyethylene waxes, and the like, and combinations thereof.
Examples of the weather-resistance agent may include without
limitation benzophenone-type weather-resistance agents, amine-type
weather-resistance agents, and the like, and combinations thereof.
Examples of the colorant may include without limitation dyes,
pigments, and the like, and combinations thereof. Examples of the
ultraviolet (UV) blocking agent may include without limitation
titanium dioxide (TiO.sub.2), carbon black, and the like, and
combinations thereof. Examples of the nucleating agent may include
without limitation talc, clay, and the like, and combinations
thereof.
[0083] The additive may be included in a predetermined amount as
long as it does not deteriorate the properties of the thermoplastic
resin composition. In exemplary embodiments, the thermoplastic
resin composition may include the additive in an amount of less
than or equal to about 40 parts by weight, for example about 0.1 to
about 30 parts by weight, based on about 100 parts by weight of the
thermoplastic resin composition.
[0084] The thermoplastic resin composition may be prepared using
any well-known method of preparing a resin composition. For
example, each component according to one embodiment of the present
invention can be simultaneously mixed, optionally with one or more
additives. The mixture can be melt-extruded and prepared as
pellets.
[0085] According to another embodiment of the present invention, a
molded product fabricated using the thermoplastic resin composition
is provided. The thermoplastic resin composition can be used to
manufacture a molded product using any various known processes such
as injection molding, blow molding, extrusion molding, thermal
molding, and the like. The thermoplastic resin composition may be
used to make a molded product having minimal or no flow marks
and/or weld lines and having a metal-like texture, such as but not
limited to plastic outer parts such as electronic parts, automobile
parts, and the like.
[0086] The following examples illustrate this invention in more
detail. However, it is understood that this invention is not
limited by these examples.
[0087] A thermoplastic resin composition according to one
embodiment includes each component as follows.
[0088] (A) Thermoplastic Resin
[0089] As a rubber modified vinyl-based copolymer resin, SD-0150
produced by Cheil Industries INC., which is an ABS resin, is
used.
[0090] (B) Metal Particle Obtained by Punching
[0091] (B-1) Aluminum particles having a cross-sectional area of
2,500 .mu.m.sup.2, a long diameter of 50 .mu.m and a thickness of
10 .mu.m are used.
[0092] (B-2) Aluminum particles having a cross-sectional area of
2,500 .mu.m.sup.2, a long diameter of 50 .mu.m and a thickness of 6
.mu.m are used.
[0093] (C) Inorganic Particle
[0094] Amorphous sheet-shaped glass particles having a
cross-sectional area of 2,000 .mu.m.sup.2, a long diameter of 50
.mu.m, and a thickness of 4 .mu.m are used.
Examples 1 to 7 and Comparative Examples 1 to 4
[0095] The thermoplastic resin compositions according to Examples 1
to 7 and Comparative Examples 1 to 4 are prepared using the
components described above the following Table 1 according to the
amounts described in Table 1.
[0096] As for the manufacturing method, the components are mixed in
the amounts shown in the following Table 1, and the mixture is
extruded at a temperature range of 180 to 240.degree. C. with a
typical twin-screw extruder, and the extruded material is
manufactured in pellets.
[0097] The manufactured pellets are dried at 80.degree. C. for 4
hours, and a material specimen is manufactured using an injection
molding machine capable of 6 oz injection, setting a cylinder
temperature at 210 to 230.degree. C., a molding temperature at
100.degree. C. and molding cycle time at 30 seconds, and performing
injection-molding to form ASTM dumb-bell specimens. The properties
of the manufactured material specimen are measured in accordance
with the following methods and the results are shown in the
following Table 1.
[0098] 1) IZOD impact strength: measured according to ASTM D256
(specimen thickness 1/8'').
[0099] 2) Injection appearance: Injection is performed to form a
weld line by using a mold having two gates, and the result of
observing the appearance of an injected material is shown based on
the standards shown in the following Table 2.
TABLE-US-00001 TABLE 1 Comparative Examples Examples 1 2 3 4 5 6 7
1 2 3 4 (A) Thermoplastic 100 100 100 100 100 100 100 100 100 100
100 resin (parts by weight) (B) Metal (B-1, parts 0.3 0.3 0.3 1 0.5
0.5 1 -- -- -- -- particle by weight) obtained (B-2, parts -- -- --
-- -- -- -- 0.5 1 10 -- by by weight) punching (C) Inorganic
particle -- 0.3 0.5 -- 0.3 0.5 0.5 -- -- -- 1 (parts by weight)
IZOD impact strength 17 15 14 13 13 12 10 13 11 3 8 (kgf cm/cm)
Injection Metal-like .largecircle. .circleincircle.
.circleincircle. .circleincircle. .circleincircle. .circleincircle.
.circleincircle. X .largecircle. .circleincircle. X appearance
texture Flow mark .circleincircle. .circleincircle.
.circleincircle. .largecircle. .circleincircle. .largecircle.
.largecircle. .DELTA. X X .circleincircle. Weld line
.circleincircle. .circleincircle. .largecircle. .largecircle.
.largecircle. .largecircle. .largecircle. X X X
.circleincircle.
TABLE-US-00002 TABLE 2 Flow mark Metal-like texture Weld line
.circleincircle. None Excellent None .largecircle. A little Good A
little .DELTA. Occurrence A little Occurrence X Serious occurrence
None Serious occurrence
[0100] The thermoplastic resin compositions according to Examples 1
to 7 including the thermoplastic resin and a metal particle
obtained by punching and having a ratio of a thickness relative to
a long diameter of about 1:7 to about 1:1 in accordance with one
embodiment have excellent impact strength, formed minimal or no
flow marks and/or weld lines, and provide an excellent metal-like
texture, compared with the thermoplastic resin compositions
according to Comparative Examples 1 to 3 using a metal particle
having a ratio of thickness relative to long diameter outside of
the range of about 1:7 to about 1:1, and the thermoplastic resin
compositions according to Comparative Example 4 which did not
include the metal particle.
[0101] Many modifications and other embodiments of the invention
will come to mind to one skilled in the art to which this invention
pertains having the benefit of the teachings presented in the
foregoing descriptions. Therefore, it is to be understood that the
invention is not to be limited to the specific embodiments
disclosed and that modifications and other embodiments are intended
to be included within the scope of the appended claims. Although
specific terms are employed herein, they are used in a generic and
descriptive sense only and not for purposes of limitation, the
scope of the invention being defined in the claims.
* * * * *