Aqueous thermosetting acrylic enamel for finishing flexible hydrocarbon rubber substrates

Claim 2

A flexible rubber substrate finished with 0.1-10 mil thick finish of a cross-linked thermosetting acrylic enamel; wherein the film-forming constituents of the enamel comprise: A. 70-95 percent by weight, based on the weight of the film-forming constituents, of an acrylic polymer consisting essentially of 1. 19-44 percent by weight, based on the weight of the acrylic polymer, of an alkyl methacrylate having one to four carbon atoms in the alkyl group or styrene, or a mixture thereof; 2.

Claim 3

50-75 percent by weight, based on the weight of the acrylic polymer, of an alkyl methacrylate having 6-12 carbon atoms in the alkyl group or an alkyl acrylate having 2-12 carbon atoms in the alkyl group or a mixture thereof; 3. 5-20 percent by weight, based on the weight of the acrylic polymer, of a hydroxy alkyl acrylate or a hydroxy alkyl methacrylate or a mixture thereof having two to four carbon atoms in the alkyl groups; and 4. 1 - 20 percent by weight, based on the weight of the acrylic polymer, of an α,β-ethylenically unsaturated carboxylic acid; and B. 5 - 30 percent by weight, based on the weight of the film-forming constituents, of a compatible alkylated melamine formaldehyde having one to eight carbon atoms in the alkyl group; wherein the flexible substrate comprises a surface activated thermoplastic

Claim 4

50-75 percent by weight, based on the weight of the acrylic polymer, of an alkyl methacrylate having 6-12 carbon atoms in the alkyl group or an alkyl acrylate having 2-12 carbon atoms in the alkyl group or a mixture thereof; 3. 5-20 percent by weight, based on the weight of the acrylic polymer, of a hydroxy alkyl acrylate or a hydroxy alkyl methacrylate or a mixture thereof having two to four carbon atoms in the alkyl groups; and 4. 1 - 20 percent by weight, based on the weight of the acrylic polymer, of an α,β-ethylenically unsaturated carboxylic acid; and B. 5 - 30 percent by weight, based on the weight of the film-forming constituents, of a compatible alkylated melamine formaldehyde having one to eight carbon atoms in the alkyl group; wherein the flexible substrate comprises a surface activated thermoplastic

Claim 5

polyurethane rubber. 2. The finished flexible substrate of claim 1, wherein the film-forming constituents of the enamel comprise: A. 85-90 percent by weight, based on the weight of the film-forming constituents, of an acrylic polymer consisting essentially of 1. 20-32 percent by weight, based on the weight of the acrylic polymer, of methyl methacrylate; 2. 55-65 percent by weight, based on the weight of the acrylic polymer, of butyl acrylate; 3. 8-12 percent by weight, based on the weight of the acrylic polymer, of hydroxy ethyl acrylate; and

Claim 6

1-5 percent by weight, based on the weight of the acrylic polymer of acrylic acid; and B. 10-15 percent by weight, based on the weight of the film-forming constituents, of a butylated melamine formaldehyde resin.

Claim 7

1-5 percent by weight, based on the weight of the acrylic polymer of acrylic acid; and B. 10-15 percent by weight, based on the weight of the film-forming constituents, of a butylated melamine formaldehyde resin.

Claim 8

The finished flexible substrate of claim 1, wherein the thermosetting acrylic enamel also contains 0.1-30 percent by weight, based on the weight of the enamel, of pigment.

Claim 9

The finished flexible substrate of claim 3, wherein the film-forming constituents of the enamel consist essentially of: A. 85-90 percent by weight, based on the weight of the film-forming constituents, of an acrylic polymer consisting essentially of 1. 26 percent by weight, based on the weight of the acrylic polymer, of methyl methacrylate; 2. 61 percent by weight, based on the weight of the acrylic polymer, of butyl acrylate; 3. 10 percent by weight, based on the weight of the acrylic polymer, of hydroxy ethyl acrylate; and 4. 3 percent by weight, based on the weight of the acrylic polymer of acrylic acid; and B. 10-15 percent by weight, based on the weight of the film-forming constituents, of a butylated melamine formaldehyde resin.

Claim 10

The finished flexible substrate of claim 4, wherein said substrate is a thermoplastic polyurethane of an aromatic diisocyanate and a hydroxyl-terminated polyester or a hydroxyl-terminated polyether.