U.S. patent application number 12/271922 was filed with the patent office on 2009-03-26 for waterproof and high heat resistant coated gloves.
Invention is credited to David Duncan, Robin Duncan, Richard W. Pewitt.
Application Number | 20090077704 12/271922 |
Document ID | / |
Family ID | 38723882 |
Filed Date | 2009-03-26 |
United States Patent
Application |
20090077704 |
Kind Code |
A1 |
Duncan; David ; et
al. |
March 26, 2009 |
Waterproof and High Heat Resistant Coated Gloves
Abstract
This invention relates to kitchen gloves for commercial,
industrial and/or home use, and related uses requiring waterproof
gloves or mitts with high, and low, temperature resistance; this
invention also relates to mitts or puppets that have a high wear
and high heat resistant material, yet can still grip.
Inventors: |
Duncan; David; (Saugus,
CA) ; Duncan; Robin; (Saugus, CA) ; Pewitt;
Richard W.; (Summerville, GA) |
Correspondence
Address: |
DAVID HONG, LAW OFFICE OF DAVID HONG
P.O. BOX 2111
SANTA CLARITA
CA
91386
US
|
Family ID: |
38723882 |
Appl. No.: |
12/271922 |
Filed: |
November 16, 2008 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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PCT/US2007/012012 |
May 17, 2007 |
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12271922 |
|
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60801455 |
May 17, 2006 |
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60801480 |
May 17, 2006 |
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Current U.S.
Class: |
2/16 ; 2/158;
2/161.6; 2/168; 2/169 |
Current CPC
Class: |
A41D 19/01594 20130101;
A41D 19/01547 20130101; A41D 19/01529 20130101; A41D 19/01
20130101 |
Class at
Publication: |
2/16 ; 2/158;
2/161.6; 2/168; 2/169 |
International
Class: |
A41D 13/08 20060101
A41D013/08; A41D 19/01 20060101 A41D019/01; A41D 19/00 20060101
A41D019/00; A41D 19/02 20060101 A41D019/02 |
Claims
1. A hand mitt comprising: a first sheet and a second sheet; the
first and said second sheets comprising a solid chloride rubber
material and having opposing surfaces affixed together and a common
edge peripheral region defined by an edge termination of said
respective first and said second sheet; the first and second sheets
are characterized as water resistant, stain resistant and
insulative to heat and cold temperatures; and a protective coating,
which is carried on an exterior surface of the first and the second
sheets; said protective coating comprising a chloride rubber
liquid, a pH stabilizer, an emulsion stabilizing surfactant, a
wetting surfactant, an accelerator, a curing agent, an
anti-oxidizing agent, a biocide, and a thickener.
2. The hand mitt of claim 1, wherein the chloride rubber liquid is
Neoprene 671A; the pH stabilizer is 0.7% KOH; the emulsion
stabilizing surfactant is liquid sodium alkyl sulfate and
monosodium salt of sulfated methyl oleate; the wetting surfactant
is octylphenol ethylene oxide condensate; the accelerator is zinc
2-mercaptobenzothiazole and zinc dibutyldithiocarbamate; the curing
agent is sulfur and zinc oxide; the biocide is
hexahydro-1,3,5-triethyl-s-triazine; the anti-oxidant agent is zinc
2-mercaptotolumimidazole plus phenolic antioxidant in an aqueous
slurry; and the thickener is non-ionic cellulose ether and liquid
sodium poly-acrylate.
3. The hand mitt defined in claim 1, wherein said first and said
second sheets have an irregular exterior surface chosen from raised
ribs, recesses or raised waffle-type pattern; and the first and the
second sheets further comprising a fabric material.
4. The hand mitt defined in claim 1, wherein the wetting surfactant
is a non-ionic detergent.
5. A hand mitt comprising: a first sheet and a second sheet; the
first and said second sheet comprising a fabric material and a
first chloride rubber and having opposing surfaces affixed together
and a common edge peripheral region defined by an edge termination
of said respective first and said second sheet; the first and
second sheets are characterized as water resistant, stain resistant
and insulative to heat and cold temperatures; and a protective
coating composition, which is carried on an exterior surface of the
first and the second sheets and comprises: a second chloride
rubber, a pH stabilizer, an emulsion stabilizing surfactant, a
non-ionic detergent, an accelerator, a curing agent, an
anti-oxidizing agent, a biocide, and a thickener.
6. The hand mitt defined in claim 5, wherein the second chloride
rubber is in a liquid form; the pH stabilizer is 0.7% KOH; the
emulsion stabilizing surfactant is liquid sodium alkyl sulfate and
monosodium salt of sulfated methyl oleate; the non-ionic detergent
is octylphenol ethylene oxide condensate; the accelerator is zinc
2-mercaptobenzothiazole and zinc dibutyldithiocarbamate; the curing
agent is sulfur and zinc oxide; the biocide is
hexahydro-1,3,5-triethyl-s-triazine; the anti-oxidant agent is zinc
2-mercaptotolumimidazole plus phenolic antioxidant in an aqueous
slurry; and the thickener is non-ionic cellulose ether and liquid
sodium poly-acrylate.
7. The hand mitt defined in claim 5, wherein said first and said
second sheets have an irregular exterior surface chosen from raised
ribs, recesses or raised waffle-type pattern.
8. The hand mitt defined in claim 5, wherein the fabric material
comprises nylon and polyester.
9. The hand mitt defined in claim 5, wherein the second chloride
rubber is in a liquid form and the pH stabilizer is 0.7% KOH.
10. The hand mitt defined in claim 5, wherein the emulsion
stabilizing surfactant is liquid sodium alkyl sulfate.
11. The hand mitt defined in claim 5, wherein the emulsion
stabilizing surfactant is monosodium salt of sulfated methyl
oleate.
12. The hand mitt defined in claim 5, wherein the non-ionic
detergent is octylphenol ethylene oxide condensate.
13. The hand mitt defined in claim 5, wherein the accelerator is
zinc 2-mercaptobenzothiazole.
14. The hand mitt defined in claim 5, wherein the accelerator is
zinc dibutyldithiocarbamate.
15. The hand mitt defined in claim 5, wherein the curing agent is
sulfur and zinc oxide.
16. The hand mitt defined in claim 5, wherein the biocide is
hexahydro-1,3,5-triethyl-s-triazine.
17. The hand mitt defined in claim 5, wherein the anti-oxidant
agent is zinc 2-mercaptotolumimidazole plus phenolic antioxidant in
an aqueous slurry.
18. The hand mitt defined in claim 5, wherein the thickener is
non-ionic cellulose ether and liquid sodium poly-acrylate.
19. A method of manufacturing a mitt, said mitt comprising: a first
sheet and a second sheet; the first and the second sheet comprising
a chloride rubber material and having opposing surfaces affixed
together and a common edge peripheral region defined by an edge
termination of said respective first and said second sheet; the
first and the second sheets are characterized as being water
resistant, stain resistant and insulative to heat and cold
temperatures; and a protective coating composition, which is
carried on an exterior surface of the first and the second sheets,
and comprises: a chloride rubber latex; a pH stabilizer; at least
one emulsion stabilizing surfactant; a non-ionic detergent; at
least one accelerator; at least one curing agent; a biocide agent;
an anti-oxidant; and at least one thickener, wherein said steps
comprising: a. A first heating of said mitt; b. A first cooling of
said mitt; c. Dipping said mitt into said protective coating
composition; d. Removing said mitt from said protective coating
composition; e. A second heating of said mitt, whereby said
protective coating composition is first dried at a first
temperature and then cured at a second temperature onto the
exterior surface of said sheets of the mitt.
20. The method of manufacturing of claim 20, wherein the first
temperature of the second heating is from 160 to 180 degrees
Fahrenheit and the second temperature of the second heating is
about 280 degrees Fahrenheit.
Description
PRIORITY CLAIM
[0001] Pursuant to MPEP 1895 and 35 U.S.C. 363 and 35 U.S.C. 120,
this is a continuation in part application of PCT Patent
Application No. PCT/US2007/012012, which was filed on May 17, 2007,
which claims the benefit of U.S. Provisional Patent Application No.
60/801,455, which was filed on May 16, 2006 and U.S. Provisional
Patent Application No. 60/801,480, which was filed on May 16, 2006;
these applications are incorporated by reference.
BACKGROUND OF THE INVENTION
[0002] The present invention relates to kitchen gloves for
commercial, industrial and/or home use, and related uses requiring
waterproof gloves or mitts with high, and low, temperature
resistance.
[0003] It is desirable to make kitchen gloves or mitts, or kitchen
puppet style holders out of a high heat resistant, cold resistant
and waterproof or liquid proof material. Neoprene.RTM. rubber,
which is made by the Du Pont Company and is generically known as
chloride rubber, polychloroprene or CR, is used to construct wet
suits to protect against cold and water. Chloride rubber also does
not typically burn or melt, although it can char (charcoal or
carbonize). However, when used as a glove or mitt material, it is
not fully waterproof, because there are seams. Hot liquids such as
hot oil, steam and other vapors and liquids can seep through the
glove, mitt or puppet at the seams. These liquids can also wick
along or through the seams.
[0004] The present invention also relates to mitts or puppets that
have a high wear and high heat resistant material, yet can still
grip.
[0005] The present invention introduces such refinements. In its
preferred embodiments, the present invention has several aspects or
facets that can be used independently, although they are preferably
employed together to optimize their benefits. All of the foregoing
operational principles and advantages of the present invention will
be more fully appreciated upon consideration of the following
detailed description, with reference to the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 shows a top view of a mitt in accordance with a first
embodiment of the invention;
[0007] FIG. 2 shows a side view of a gusset portion of the mitt of
FIG. 1 between the lines 2-2 of FIG. 1;
[0008] FIG. 3 shows a sectional view of the gusset portion of the
mitt of FIG. 1, taken along a line 3-3 of FIG. 2;
[0009] FIG. 4 shows a partial top view of zigzag stitching and
straight stitching on the inside of the seams of the mitt;
[0010] FIG. 5 is a view of the portion of FIG. 3 in circle 5, but
in an alternative embodiment of the invention;
[0011] FIG. 6 is a view of a step of dipping a mitt into a chloride
rubber solution for coating the mitt in accordance with a step in a
method in accordance with a second embodiment of the invention;
[0012] FIG. 7 is view of another step involving heating the mitt
before the step of dipping of FIG. 6; and
[0013] FIG. 8 is a perspective view of a coated five-fingered glove
in accordance with a third embodiment of the invention, and a
perspective view of an uncoated mitt prior to or after the step of
heating in the second embodiment.
[0014] FIG. 9 is a front view of a puppet embodiment of the
invention, with the top mouth portion and bottom mouth portion of
the puppet open;
[0015] FIG. 10 is a rear view of the puppet of FIG. 9;
[0016] FIG. 11 is a view of a portion of the inside of the puppet
at the puppet's mouth with a layer folded back;
[0017] FIG. 12 is a view similar to that of FIG. 11 with the layer
more unfolded;
[0018] FIG. 13 is a view of the inside lining of the puppet at the
mouth;
[0019] FIG. 14 is a front view of the puppet similar to FIG. 9 but
showing more detail including silicone gripping nodules;
[0020] FIG. 15 is a sectional view taken along a line 7-7 of FIG.
14; and
[0021] FIG. 16 is a view of a portion of FIG. 15 in a circle
8-8.
[0022] FIGS. 17A, 17B and 18-23 show tables related to the
Waterproof and High Heat Resistant Gloves Invention.
[0023] FIG. 24-28 show alternate embodiments of the glove
invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Waterproof and High Heat Resistant Gloves (Duncan and Pewitt)
[0024] In the preferred embodiment of the present invention, there
is a chloride rubber kitchen glove or mitt, or puppet (hereinafter
"mitt" will be used, but the same applies equally to gloves and
puppets). To waterproof and otherwise seal the seams, the glove is
coated with a chloride rubber liquid composition, e.g., a
dispersion or suspension. Suitable exemplary dispersion
formulations or compositions for the chloride rubber dispersion are
shown in attached FIGS. 17 through 23 incorporated by reference
herein.
[0025] Chloride rubber material for kitchen mitts are a big
advantage over cloth material because chloride rubber has
non-absorption and non porous characteristics, which keep
condiments, grease, or other food stuffs from staining the mitt
surface like regular cloth oven mitts.
[0026] A problem with commercially available chloride rubber is
that it contains oil or "process oil," which affects the ability
for coatings to adhere, i.e. makes it harder for the coatings to
adhere. The purpose of the process oil is to soften the chloride
rubber product, as in use for wet suits or clothing purposes.
[0027] However, use of this "process" oil in the chloride rubber
material also causes the volatilizing of the process oil at
temperatures of 250 to 350 degrees Fahrenheit, during the curing
cycle after the mitts are dipped into the chloride rubber liquid
composition. For example, after the mitt is sewn and dipped into
the protective liquid composition, this protective layer is dried;
during this drying and curing step, the volatiles of the process
oil come off from the foamed chloride rubber. These volatiles tend
to collect near the outer surface of the chloride rubber and
"balloon away" from the "dipped on" and textured foam surface and
between the original textured chloride rubber material and the
curing dipped chloride rubber film; in other words, these volatiles
can balloon the dipped chloride rubber film away from the original
material and affect the film to film adhesion.
[0028] To avoid this "volatilizing" problem, preferably, the mitts
can be formed from a foamed rubber material, which includes a
softening agent, which does not volatilize until the temperatures
reach near 400 degrees F.
[0029] In addition, the amount of oil in chloride rubber such as
that traditionally used for clothing is reduced to a point where a
chloride rubber liquid dispersion will adhere to the chloride
rubber mitt.
[0030] Once coated with the protective chloride rubber coating, the
mitt/tool can withstand 134 degrees below zero to about 500 degrees
Fahrenheit (about 260 degrees Celsius). Note that 500 degrees
Fahrenheit is listed as an upper limit for intermittent use, but
most kitchen uses are in the range of 275 to 400 degrees
Fahrenheit. Typically, inside of a glove or mitt, a user's hand
will perceive pain and first degree burns at approximately 125
degrees F. inside the glove and at the wearer's skin surface.
[0031] With the protective coating, the mitt may be immersed in hot
oil, such as for cleaning a fryer, e.g., a fast food restaurant's
hot oil vat used for French fries, while the oil still is at or
close to boiling, or at least about 350 to 360 degrees Fahrenheit.
Further, in the process of canning steamed vegetables, the steamed
vegetables can be handled. Also, in boiling soup or other food in a
bag, the heated bag can be handled and opened without the boiling
water and steam penetrating the mitt at the seams. Similarly, in
the armed forces, heated rations are carried in a hot water bath
and may be removed using the mitt of the invention, rather than a
wire basket or the like, enabling more rations to be stored in the
bath.
[0032] Preferably, as shown, e.g., in FIG. 8, the mitt, which may
also be made as a glove, is made a bit longer in length. A finished
mitt with the coating is shown in FIG. 8 as element 4. Also, near
the end 4a of the mitt 4, there is a cuff 8 (folded over and
stitched at 8a, FIG. 1, to the glove) to prevent liquids from
flowing along the mitt and going past end 4a onto the wearer's skin
or clothes.
[0033] FIG. 2 shows a gusset 10 as a strip of material, which may
go part way or all the way around the periphery of the glove, and
is represented by the dark lines in FIG. 1. Gusset 10 meets the
front and back main pieces of material 4b and 4c at seems 10.
[0034] FIG. 3 shows connection of the front material 4b to the
gusset 10 and the gusset 10 to the back material 4c. (This material
is sewn together before the coating is applied, i.e., while
chloride rubber base layer 16 is still exposed.)
[0035] If no gusset is used, then front and back material (or front
and back of finger portions in a glove) are connected by one seam.
FIG. 3 shows the two seams 10a where the chloride rubber material
is uncoated on the inside and is sewn together by threads 11.
Preferably, one thread 11 e.g., proximate the outside of the glove
is non-bonded or absorbent to receive the coating in accordance
with the invention, while a second thread 11 is bonded for strength
at the seam. Coating 14 of the cross-linked or cured chloride
rubber dispersion covers the entire exterior of the glove and
penetrates or seals off each seam, except that it is preferred not
to coat near end 4a to form a cuff, as noted above. Other
embodiments can have a fully coated glove.
[0036] In a further preferred version, as shown in FIG. 4, the
outer stitch 11 of the seam is straight and is very close to the
outside of the mitt, while the inner stitch 11' of the seam is in a
zigzag or even a double zigzag pattern, for even more strength.
Note various other stitching patterns can be used.
[0037] In FIG. 5, a "foamier" version of chloride rubber 16a or the
like, is used, and chloride coating 14 is applied to rubber 16a, in
the same manner as described herein for chloride rubber 16.
Method of Manufacture:
[0038] FIGS. 6, 7 and 8, are for explaining one preferred method of
making such a mitt. First, an uncoated mitt, or as shown in FIG. 8,
a glove 6 (five fingered glove) is shown before the coating is
applied. The mitt or glove is formed as follows:
Forming the Mitt Body:
[0039] Preferably, the chloride rubber mitts are prepared by
cutting chloride rubber raw material into appropriate pieces for a
mitt or glove, then folding over the edges and sewing them together
(i.e., at the insides of the mitt or glove in order to minimize any
exterior seams). This step of sewing or other bonding, preferably
using a porous outer bonding element (e.g., stitching 11) is
performed with the mitt inside out.
[0040] In addition, alternate methods of closing the seams can be
used, including without limitation: gluing or binding with tape. In
the preferred embodiment, a "zig zag" stitch is used for strength
at the cut edges, and just inside the zig zag stitching, a straight
stitch is placed with the stitches spaced closely together to
assist in stopping penetration of the chloride rubber coating from
penetrating into the cavity of the mitt or glove. This closely
spaced straight stitching should be of a composition that will
promote coagulation of the liquid chloride rubber coating on
contact.
[0041] Then, the mitt or glove is inverted or turned so that the
seams are inside and the textured chloride rubber is outside. The
nylon or polyester textile fabric will be to the inside of the mitt
or glove. This textile fabric surface is inside the glove or mitt
is for comfort and ease of donning and removing the glove or mitt.
Other textiles can be used in this invention, including without
limitation Kevlar brand, Nomex brand, PEEK or some naturally
occurring fibers; additional textiles can be employed to add flame
resistance, biocide properties, cut-resistance and heat
absorption.
Pre-Coating Heating Step:
[0042] Mitts 4 are mounted on heat resistant forms 20 and placed in
an oven 22 in lots, e.g., in lots of twenty (for example only).
Preferably, the oven is heated to a temperature and for a time
sufficient to remove significant oil, e.g., to 300 degrees F., and
oil is "burned off" for about 45 minutes. When excess volatiles
have been removed, the mitts are removed from the forms and allowed
to cool, while another batch is "burned off." This term "burned
off" is intended to mean the heating of the mitts to remove process
oil.
[0043] Mitts are mounted or loaded on a rack or form holder. The
forms help position the thumb in the mitt. This batch or lot-type
manufacturing process and the use of forms are for example and are
not intended to be limiting; continuous line manufacturing can also
be employed.
[0044] Note also with use of a chloride rubber material with a
lower content of process oil or a different softening agent may
allow for reduction or elimination of this heating step. In other
words, after the forming or sewing of the glove or mitt, the next
step would be dipping or coating of the chloride rubber liquid
composition.
Dipping or Coating Step:
[0045] The rubber chloride compound or composition is agitated, and
pH and viscosity are selected to enable a smooth coating of desired
thickness.
[0046] The mitts 4 are slowly immersed in dispersion 30 in a
container 32. One exemplary rate is 10 inches per minute until the
desired depth for that mitt has been reached. This slow immersion
rate allows the chloride rubber dispersion to wet the textured mitt
surface and flush any air in front of the wet edge. This step may
take a minute or so, e.g., 72 seconds (1 min 12 sec). Note that the
total time for immersion or dipping is dependent on the size or
length of the product being dipped; for example, preferred lengths
of the mitt product are 10, 12, 14 inches or shoulder length.
[0047] The mitts are then withdrawn or removed from the compound
preferably at a like rate to the dipping rate, e.g., again 10
inches per minute. The slow withdrawal rate works with the rheology
of the compound to pull most of the excess compound off the glove
so there is very little drip or compound movement.
Post-Coating Drying and Curing:
[0048] Oven Drying and Curing Version One: After about 3-4 minutes,
the coated mitts are then placed in the oven again at the range of
160.degree. F. to 1800 degrees F. The oven is filled with mitts
taking about 1 hour and 45 minutes and held for 10 minutes. After
10 minutes, the oven is turned up to 200 degrees F. for 80 minutes.
After 80 minutes, the oven is turned up to 280 degrees F. for 45
minutes. After a total of 135 minutes (2 hours 15 minutes), the
last mitts then are unloaded from the oven and cooled for the
coating to harden.
[0049] Oven Drying and Curing Version Two: In the alternative, the
coated mitts are placed in an oven at a range of 160 to 180 degrees
F. for approximately 65 to 75 minutes for drying the moisture from
the liquid chloride rubber coating. Then, the oven temperature is
increased to about 280 degrees F. for approximately 45 minutes to
cause chemical cross-linking or curing of the protective layer. The
mitts or glove are removed and allowed to cool for inspection. The
mitts preferably are inspected for pinholes along the seams. One
possible inspection test is a leak test. The mitt is filled with
pressured air and submerged into a water bath, and the presence of
air bubbles is used as the pass or the fail benchmark. Such leak
type tests are well known to those in the glove or mitt
industry.
[0050] The same coating process may be used by starting with mitts
having chloride rubber that is lower in oil than standard. With
lower oil content, the chloride rubber is stiffer, and more like
chloride rubber, which would be used for a gasket or seal, than
clothing or other items that are worn.
[0051] Note that the inventors have discovered that using a greater
amount of soap (i.e. a non-ionic detergent like TRITON X100) during
the manufacturing process using a textile material of fabric. This
greater amount of soap is contrary to what is used in the
industry.
Composition of Liquid Chloride Rubber:
[0052] FIG. 17A shows beginning formulations for the chloride
rubber coating compound (latex, liquid, dispersion). The
formulation begins with a liquid chloride rubber, such as DuPont
brand neoprene latex, which is common to the glove and mitt dipping
industries. The latex is stabilized with caustics and surfactants.
There are cross-linking accelerators and cure ingredients,
antioxidants and coloring, biocide, and rheology ingredients.
[0053] Note that the wetting agent or surfactant Triton X100 or
similar materials are used at higher levels (compared to dipping
formulations used to dip traditional textile substrates) to assist
the coating compound to better wet the surface of the previously
cured closed cell chloride rubber foam material. This elevated
level of a highly proficient wetting agent like Triton X100 is not
normal in dipping compounds used with textile supported gloves
because a wetting agent would cause a great deal of penetration of
the coating compound into the interior of the glove. Using a
wetting surfactant such as Triton X100 is contrary to what is known
in the art for traditional textile substrates or fabrics.
[0054] FIG. 17B shows another composition for the chloride rubber
coating.
[0055] FIGS. 18-23 show formulations for dispersions of some of
those ingredients used in the formulation of FIGS. 17A and 17B.
There can be adjustments of active ingredients solids for ease of
incorporation of ingredients.
[0056] In one preferred embodiment, the chloride rubber liquid
composition can include:
a. chloride rubber material or chloride rubber latex such as
Neoprene 671A (polychloroprene, anionic colloidal dispersion in
water; POLY(2-CHLORO-1,3-BUTADIENE) and COPOLYMERS; Neoprene 671A
liquid dispersion (LD) contains a high modulus polychloroprene
homopolymer made in an anionic colloidal system; good wet gel
elongation and wet gel tensile strength make wet films of Neoprene
671A resistant to gel cracking, either alone or in blends with
other Neoprene liquid dispersion; 671A is used for dipped goods,
construction mastics, laminating adhesives, extruded thread,
impregnated paper, bonded batts and contact bond adhesives); b. the
pH stabilizer can be 0.7% KOH; the emulsion stabilizing surfactant
can be DARVAN WAQ (liquid sodium alkyl sulfate from R.T. Vanderbilt
Co., Inc.) and DARVAN SMO (a monosodium salt of sulfated methyl
oleate from R.T. Vanderbilt Co., Inc.); other emulsion stabilizing
surfactants can be used; c. the accelerator can be ZMBT (zinc
2-mercaptobenzothiazole (chemical name: 2(3H)-Benzothiazolethione,
zinc salt); see R.T. Vanderbilt Co., Inc.'s accelerator product
ZETAX brand ZMBT) and Butyl Zimate (a white to cream zinc
dibutyldithiocarbamate from R.T. Vanderbilt Co., Inc.); other
possible accelerators can be used; d. the curing agents can be
sulfur and zinc oxide (zinc oxide acts as a vulcanizing agent in CR
and XNBR latex); e. the biocide can be Vancide TH
(hexahydro-1,3,5-triethyl-s-triazine (chemical name:
1,3,5-Triazine, 1,3,5-triethylhexahydro-) from R.T. Vanderbilt Co.,
Inc.); other biocides can be used as well; f. the anti-oxidant
agent can be Vanox SPL Slurry (Zinc 2-mercaptotolumimidazole plus
phenolic antioxidant in an aqueous slurry; a zinc
2-mercaptotolumimidazole white liquid from R.T. Vanderbilt Co.,
Inc.); other anti-oxidants can be used as well; g. the wetting
surfactant can be Triton X100 (a non-ionic detergent; an
octylphenol ethylene oxide condensate; the "Triton X" series of
detergents are produced from octylphenol polymerized with ethylene
oxide; the number ("-100") relates only indirectly to the number of
ethylene oxide units in the structure; Triton X-100 has an "average
of 9.5" ethylene oxide units per molecule, with an average
molecular weight of 625); other possible wetting surfactants can be
used to "wet" a rubber surface; h. the thickener can be Bermocoll
100 or Bermocoll 200 (Bermocoll is a non-ionic cellulose ether from
the AKZO NOBEL company and produced in a number of different
particle sizes: powder, fine powder and extra-fine powder; users
simply choose the particle size that gives their products the
solubility they need; it can also be tailor-made to meet individual
needs and specifications and is compatible with most binders,
fillers, polymers, and surfactants used in building materials,
paints and gloves; note other sizes of non-ionic cellulose ethers
can be used) and Alcogum 9710 (ALCOGUM 9710 from ALCOChemical is a
clear to slightly opaque liquid sodium poly-acrylate thickener
(acylic acid homopolymer, sodium salt), which can be used in the
thickening of natural and synthetic latexes for a wide variety of
applications in coatings and rubber articles; ALCOGUM 9710 may be
used to thicken styrene-butadiene, neoprene, acrylic, vinyl acetate
and ethylene-vinyl acetate latex compounds); note other thickeners
can be used; and i. a coloring agent such as carbon black can also
be used.
[0057] The inventors used Bermocoll and Alcogum products in a blend
to obtain a certain desired rhelogy; both materials increase
viscosity, but because they increase thixotropy "flow properties"
at different rates, the inventors use a blend of both thickeners in
the composition.
[0058] The above listed chemical company products are for example
only and are not intended to be limiting. The above dipping
composition can be used for a variety of different types of mitts
and gloves, including mitts with gussets, puppet-style mitts, and
five-finger gloves.
[0059] Some manufacturing steps: cutting chloride rubber material
into the mitt/glove parts; logo or design printing on the
mitt/glove parts; sewing the mitt/glove parts of the chloride
rubber material into a mitt or glove; turning/inverting the mitt or
glove (so as to cover any exposed seams); "burn off" or heating of
mitts to remove "volatiles" or oils in chloride rubber materials
while on a form; load with thumb; dip mitts into protective coating
liquid composition; remove mitts from protective coating liquid
composition; oven drying and oven curing of the coated
mitts/gloves; unload cured mitts/gloves; inspect; attaching or bar
tack sewing of the cuff and/or loop; and labeling and packing of
the finished product.
[0060] The hand mitt defined can be made from more than one sheet
of material and have an irregular exterior surface chosen from
raised ribs, recesses or raised waffle-type pattern; these sheets
can further have a fabric material backing or textile supported
material.
[0061] Note that the above description for the liquid chloride
rubber protective coating is specified for neoprene latex; however,
other polymeric coatings, including but not limited to XNBR or SBR
or natural rubber, can be used.
/// /// High Wear and Heat Resistant Gloves with Gripping Pods
(Duncan)
[0062] As shown in FIGS. 9-10 and 14, a puppet 1 for use as a
kitchen tool or the like for handling hot or cold items has a mouth
having an upper portion 2 and a lower portion 4. The main body 8 of
the puppet may be made of a suitable hot and cold resistant
material such as Neoprene.RTM. rubber made by the Du Pont chemical
company, or generically known as chloride rubber. The body 8 may be
made by stitching at the seams as is explained in a provisional
patent application concurrently filed herewith, by folding in each
layer and stitching the seams using a straight stitch and/or a
zigzag or double zigzag stitch, or other suitable bonding.
[0063] U.S. Provisional Patent Application Ser. No. 60/801,455
(Filed 17 May 2006) is entitled WATERPROOF AND HIGH HEAT RESISTANT
COATED GLOVES with inventors: David D. Duncan and Richard W. Pewitt
and is incorporated by reference herein.
[0064] The preferred embodiment of the present invention uses a
high heat resistant and high durability material such as Nomex.RTM.
10 for the mouth of the puppet and another high heat resistant
material Kevlar.RTM. 12 in the central gripping area of mouth 10 on
the upper and lower portions.
[0065] This invention allows interchangeable use of Kevlar and
Nomex brand materials; both materials can be coated with a silicone
backing. The one advantage of Nomex is that it can be dyed into
more colors than Kevlar.
[0066] In another preferred embodiment: the manufacturing steps
could include having the mouth part of the mitt textile screen
printed with the silicon dots/nodules, which would simplify the
sewing construction and reduce the amount of heat absorbing textile
materials. The silicone nodules help to restore grip (lost by the
textile fabric faces) and create an additional air gap between the
heat source and the surface of the mitt or glove.
[0067] The Nomex material is not very porous and is not easy to
grip with. The Kevlar material also is not easy to grip with, but
has more porosity. Therefore, the Kevlar is used in the gripping
area, and silicone nodules 14 are formed to protrude from, but also
to be rooted in, the porous surface of the Kevlar.
[0068] The Nomex area may have a lip 10a and 10b folded over the
back side and stitched at 15 to the back chloride rubber layer 18.
The folds 22 (FIG. 15) enable stitching and seams to be covered up.
The stitching 24 may be straight or zigzag or other stitching or
bonding. The stitching preferably passes through the Nomex 10, then
the Kevlar 12, then the Nomex, then a silicone rubber layer 17,
then the chloride rubber. The stitching 26 at the chloride rubber
seams may also bind the edges of the Nomex 10; the silicone nodules
are preferably food grade.
[0069] In addition, across the back of the puppet mouth or thumb
crotch, some of the stitching was present to create a line, which
would make flexing of the multilayered palm area easier. This
"line" stitching for improving flexion would preferably be done
only through the Nomex and Kevlar and foamed silicone layers and
not the chloride rubber layer(s).
[0070] In other versions, the mitt would employ other non-stitching
connection methods to secure the different material layers
together; in particular, other embodiments would avoid using
stitching to connect the chloride rubber layer to the other layers
(Nomex and Kevlar layers); stitching may puncture the chloride
rubber layer in the mid palm area, which might possibly would allow
steam, liquid or stains to penetrate.
[0071] This mitt provides great gripping, with high heat resistance
(i.e., significantly more than typical high kitchen temperatures of
500 degrees Fahrenheit), and wear resistance significantly greater
than the typical mitt or puppet wear resistance. To provide water
or liquid resistance, and a steam barrier, the folds are
provided.
[0072] The silicone nodules or dots may be applied to the Kevlar
using a perforated drum/rotary screen or flat bed screen and then
curing in an oven. The Kevlar may be cut to size before or after
applying the nodules.
[0073] There is a hand or multi-purpose mitt comprising: a first
sheet and a second sheet; the first and said second sheets
comprising a solid chloride rubber material and having opposing
surfaces affixed together and a common edge peripheral region
defined by an edge termination of said respective first and said
second sheet; the first and second sheets are characterized as
water resistant, stain resistant and insulative to heat and cold
temperatures; and a protective coating, which is carried on an
exterior surface of the first and the second sheets; said
protective coating comprising a chloride rubber liquid, a pH
stabilizer, an emulsion stabilizing surfactant, a wetting
surfactant, an accelerator, a curing agent, an anti-oxidizing
agent, a biocide, and a thickener.
[0074] Further defining the hand mitt, the chloride rubber liquid
is Neoprene 671A; the pH stabilizer is 0.7% KOH; the emulsion
stabilizing surfactant is liquid sodium alkyl sulfate and
monosodium salt of sulfated methyl oleate; the wetting surfactant
is a non-ionic detergent or octylphenol ethylene oxide condensate;
the accelerator is zinc 2-mercaptobenzothiazole and zinc
dibutyldithiocarbamate; the curing agent is sulfur and zinc oxide;
the biocide is hexahydro-1,3,5-triethyl-s-triazine; the
anti-oxidant agent is zinc 2-mercaptotolumimidazole plus phenolic
antioxidant in an aqueous slurry; and the thickener is non-ionic
cellulose ether and liquid sodium poly-acrylate.
[0075] A method of manufacturing a mitt, said mitt comprising: a
first sheet and a second sheet; the first and the second sheet
comprising a chloride rubber material and having opposing surfaces
affixed together and a common edge peripheral region defined by an
edge termination of said respective first and said second sheet;
the first and the second sheets are characterized as being water
resistant, stain resistant and insulative to heat and cold
temperatures; and a protective coating composition, which is
carried on an exterior surface of the first and the second sheets,
and comprises: a chloride rubber latex; a pH stabilizer; at least
one emulsion stabilizing surfactant; a non-ionic detergent; at
least one accelerator; at least one curing agent; a biocide agent;
an anti-oxidant; and at least one thickener, wherein said steps
comprising:
a. A first heating of said mitt; b. A first cooling of said mitt;
c. Dipping said mitt into said protective coating composition; d.
Removing said mitt from said protective coating composition; e. A
second heating of said mitt, whereby said protective coating
composition is first dried at a first temperature and then cured at
a second temperature onto the exterior surface of said sheets of
the mitt.
[0076] For the method of manufacturing, the first temperature of
the second heating is from 160 to 180 degrees Fahrenheit and the
second temperature of the second heating is about 280 degrees
Fahrenheit.
[0077] While the invention as described above in connection with
preferred embodiments, it will be understood that it is not
intended to limit the invention to those embodiments. On the
contrary, it is intended to cover all alternatives, modifications,
and equivalents as may be included within the spirit and scope of
the invention as defined by the appended claims. Any element in a
claim that does not explicitly state "means for" performing a
specific function, or "step for" performing a specific function, is
not be interpreted as a "means" or "step" clause as specified in 35
U.S.C. Sec. 112, Paragraph 6. In particular, the use of "step of"
in the claims herein is not intended to invoke the provisions of 35
U.S.C. Sec. 112, Paragraph 6.
* * * * *