Compositions – Leather or fur treating
Reexamination Certificate
2000-01-10
2001-09-18
Green, Anthony (Department: 1755)
Compositions
Leather or fur treating
C427S389000, C525S360000, C525S370000, C525S371000, C525S372000, C525S373000
Reexamination Certificate
active
06290866
ABSTRACT:
This invention relates to an aqueous composition suitable for use in coating leather and a method for coating leather with an aqueous coating composition to provide coated leather having good embossability and wet-flex endurance. More particularly this invention relates to an aqueous composition including an emulsion polymer including from 0.4% to 10% by weight of copolymerized acetoacetate or acetoacetamide monomer based on the weight of the polymer and having a glass transition temperature (Tg) from −20° C. to 10° C. More particularly, in a second embodiment, this invention relates to an aqueous composition including an emulsion polymer including from 0.1% to 6% by weight of copolymerized acetoacetate or acetoacetamide monomer based on the weight of the polymer and from 2% to 15% by weight of copolymerized carboxylic acid monomer based on the weight of the polymer and having a glass transition temperature (Tg) from −20° C. to 10° C., the polymer having been contacted with a transition metal oxide, hydroxide, or carbonate at a pH of less than 9 in an amount greater than 0.20 equivalent of transition metal per equivalent of the copolymerized carboxylic acid monomer in the polymer.
The present invention serves to provide an aqueous composition suitable for use in coating leather, particularly a basecoating, that is aesthetically pleasing and protective and a method for coating leather. The protective properties of the leather coating may be measured by the flexing endurance of the coated leather, particularly under wet conditions. The coating may be subsequently embossed for decorative purposes with a desired imprint in a heated press. The softness of the final coated leather, the ability of the coating to be embossed easily without clinging to the heated press and the retention of the desired imprint are measured aesthetic properties of the coated leather.
U.S. Pat. No. 5,202,375 discloses a water-resistant polymeric emulsion and coatings containing the emulsion applied to particle board and plywood. The polymeric emulsion polymer contains from about 1 to about 5 weight percent olefinic carboxylic acid monomer and from about 0.5 to about 5 weight percent crosslinking monomer such as, for example, acetoacetoxyethyl methacrylate; and has a Tg of about −50° C. to about 50° C., preferably from about 0° C. to about 20° C.
The problem faced by the inventors is the provision of an aqueous composition suitable for use in coating leather that is aesthetically pleasing and protective and a method for coating leather which yields a dried coating on leather that has good embossability and wet-flex resistance.
In a first aspect of the present invention there is provided an aqueous composition suitable for use in coating leather including an emulsion polymer including from 0.4% to 10% by weight of copolymerized acetoacetate or acetoacetamide monomer based on the weight of the polymer and having a glass transition temperature (Tg) from −20° C. to 10° C.
In a second aspect of the present invention there is provided an aqueous composition suitable for use in coating leather including an aqueous emulsion polymer including from 0.1% to 6% by weight of copolymerized acetoacetate or acetoacetamide monomer based on the weight of the polymer and from 2% to 15% by weight of copolymerized carboxylic acid monomer based on the weight of the polymer and having a glass transition temperature (Tg) from −40° C. to 0° C.; the polymer having been contacted with a transition metal oxide, hydroxide, or carbonate at a pH of less than 9 in an amount greater than 0.20 equivalent of transition metal per equivalent of copolymerized carboxylic acid monomer in the polymer.
In a third aspect of the present invention there is provided a method for coating leather including (a) forming an aqueous composition including an emulsion polymer including from 0.4% to 10% by weight of copolymerized acetoacetate or acetoacetamide monomer based on the weight of the polymer and having a glass transition temperature (Tg) from −20° C. to 10° C.; (b) coating leather with the aqueous composition; and (c) drying, or allowing to dry, the aqueous composition.
In a fourth aspect of the invention there is provided a method for coating leather including (a) forming an aqueous composition including an emulsion polymer including from 0.1% to 6% by weight of copolymerized acetoacetate or acetoacetamide monomer based on the weight of the polymer and from 2% to 15% by weight of copolymerized carboxylic acid monomer based on the weight of the polymer and having a glass transition temperature (Tg) from −40° C. to 0° C.; (b) contacting the polymer with a transition metal oxide, hydroxide, or carbonate at a pH of less than 9 in an amount greater than 0.20 equivalent of transition metal per equivalent of the copolymerized carboxylic acid monomer in the polymer; (c) coating leather with the aqueous composition; and (d) drying, or allowing to dry, the aqueous composition.
This invention relates to a composition suitable for use in coating leather and a method for coating leather with an aqueous composition including an emulsion polymer including at least one copolymerized ethylenically unsaturated monomer and from 0.4% to 10% by weight, preferably from 0.4% to 4% by weight, of copolymerized acetoacetate or acetoacetamide monomer and has a glass transition temperature (Tg) from −20° C. to 10° C. The emulsion polymer contains at least one copolymerized ethylenically unsaturated monomer exclusive of copolymerized acetoacetate or acetoacetamide monomer such as, for example, a (meth)acrylic ester monomer including methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, decyl acrylate, lauryl acrylate, methyl methacrylate, butyl methacrylate, isodecyl methacrylate, lauryl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, aminoalkyl (meth)acrylates; styrene or substituted styrenes; butadiene; vinyl acetate or other vinyl esters; vinyl monomers such as vinyl chloride, vinylidene chloride, N-vinyl pyrollidone; and acrylonitrile or methacrylonitrile. The use of the term “(meth)” followed by another term such as acrylate or acrylamide, as used throughout the disclosure, refers to both acrylates or acrylamides and methacrylates and methacrylamides, respectively. Preferred is the absence of copolymerized monomers containing functional group(s) capable of chemical reaction with acetoacetate or acetamide groups such as, for example aldehyde and amine groups. Preferred is a polymer including 25-65% by weight of copolymerized ethyl acrylate.
The emulsion polymer contains from 0.4% to 10% by weight of copolymerized acetoacetate or acetoacetamide monomer, i.e., an ethylenically unsaturated monomer containing an acetoacetate or acetoacetamide grouping, such as, for example, vinyl acetoacetate, acetoacetoxyethyl (meth)acrylate, acetoacetoxypropyl (meth)acrylate, allyl acetoacetate, acetoacetoxybutyl (meth)acrylate, 2,3-di(acetocacetoxy)propyl (meth)acrylate, vinyl acetoacetamide, and acetoacetoxyethyl (meth)acrylamide.
The emulsion polymer may also contain from 0% to 10% of a copolymerized monoethylenically-unsaturated carboxylic acid monomer, based on the weight of the polymer, such as, for example, acrylic acid, methacrylic acid, crotonic acid, itaconic acid, fumaric acid, maleic acid, monomethyl itaconate, monomethyl fumarate, monobutyl fumarate, and maleic anhydride. Preferred carboxylic acid monomers are acrylic acid, methacrylic acid, and itaconic acid.
The emulsion polymer used in this invention may also contain from 0% to 5% copolymerized multi-ethylenically unsaturated monomers such as, for example, allyl methacrylate, diallyl phthalate, 1,4-butylene glycol dimethacrylate, 1,2-ethylene glycol dimethacrylate, 1,6-hexanediol diacrylate, and divinyl benzene.
The glass transition temperature (“Tg”) of the emulsion polymer is from −20° C. to 10° C., as measured by differential scanning calorimetry (DSC) taking the mid-point in the heat flow versus temperature transition as the Tg v
Lesko Patricia Marie
Schindler Frederick James
Bakule Ronald D.
Green Anthony
Rohm and Haas Company
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