Ford Motor Company Limited

Elaine C Siwiec

Ares N Theodore

Henk Van Oene

Henk Yar Oene

Improved powder coating compositions are disclosed which a particulate mixture of (1) an epoxy-functional copolymer of about 5 to about 20 weight percent of a glycidyl ester of a monoethylenically unsaturated acid and about 95 to about 80 weight percent of monoethylenically unsaturated monomers consisting essentially of monofunctional monomers selected from the group consisting of esters of a C.sub.1 - C.sub.8 monohydric alcohol and acrylic acid, esters of a C.sub.1 - C.sub.8 monohydric alcohol and methacrylic acid and C.sub.8 - C.sub.12 monovinyl hydrocarbons, and having a glass transition temperature in the range of 40.degree. to about 90.degree. C. and a molecular weight (M.sub.n) in the range of about 1,500 to about 15,000, (2) an anhydride crosslinking agent selected from the group consisting of (a) monomeric anhydrides of dicarboxylic acids and (b) homopolymers of monomeric anhydrides of dicarboxylic acids, and present in an amount that provides about 0.3 to about 1.2 anhydride groups for each epoxy group on said copolymer, and (3) a hydroxy carboxylic acid having a melting point in the range of about 400.degree. to about 150.degree. C. and present in an amount such as to provide about 0.1 to about 0.4 carboxyl groups per epoxy group in said copolymer.

Powder paint with epoxy copolymer with anhydride and hydroxy acids

Improved powder coating compositions are disclosed which comprise a particulate mixture of (1) a qualitative difunctional copolymer of about 5 to 20 weight percent of a glycidyl ester of a monoethylenically unsaturated acid, about 2 to about 10 weight percent of a monomeric alpha-beta olefinically unsaturated amide and about 70 to about 93 weight percent of other monoethylenically unsaturated monomers consisting essentially of monofuctional, monomers selected from the group consisting of esters of a C.sub.1 - C.sub.8 monohydric alcohol and acrylic acid, esters of a C.sub.1 - C.sub.8 monohydric alcohol and methacrylic acid and C.sub.8 - C.sub.12 monovinyl hydrocarbons, (2) an anhydride crosslinking agent selected from the group consisting of (a) monomeric anhydrides of dicarboxylic acids and (b) homopolymers of monomeric anhydrides of dicarboxylic acids and present in an amount that provides about 0.3 to about 1.2 anhydride groups for each functional group on said copolymer, and (3) a hydroxy carboxylic acid having a melting point in the range of about 40.degree. to about 150.degree. C. and present in an amount such as to provide about 0.1 about 0.4 carboxyl groups per functional group on said copolymer.

Powder paint with epoxy and amide copolymer with anhydrides and hydroxy

Improved powder coating compositions are disclosed which comprise a particulate mixture of (1) a qualitatively difunctional copolymer of about 5 to about 20 weight percent of a glycidyl ester of a monoethylenically unsaturated acid, about 2 to about 10 weight percent of difunctional monomers selected from C.sub.5 - C.sub.7 hydroxyalkyl acrylates and C.sub.5 - C.sub.7 hydroxylalkyl methacrylates, and about 70 to about 93 weight percent monoethylenically unsaturated monomers consisting essentially of monofunctional monomers selected from the group consisting of esters of a C.sub.1 - C.sub.8 monohydric alcohol and acrylic acid, esters of a C.sub.1 - C.sub.8 monohydric alcohol and methacrylic acid and C.sub.8 - C.sub.12 monovinyl hydrocarbons, (2) an anhydride crosslinking agent selected from the group consisting of

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Inkster, MI, United States of America

Elaine C Siwiec