Powder coating compositions
AssigneePPG Industries, Inc.
InventorsPaul H. Pettit, Jr., Marvin L. Kaufman
Life of this patent
Estimating the term…
Abstract
A thermosetting powder coating composition which has good handling properties and which has a good blend of physical properties such as appearance, flexibility, hardness, solvent resistance, corrosion resistance and exterior durability is disclosed. The composition comprises a co-reactable particulate mixture of an acid group-containing acrylic polymer; an aliphatic dicarboxylic acid containing from 4 to 20 carbon atoms per molecule and/or a polymeric polyanhydride and a beta-hydroxy alkylamide crosslinking agent.
Claims11
A thermosetting powder coating composition comprising a co-reactable particulate mixture of:
- (A) 35-85 percent by weight based on weight of resin solids of an acid group-containing acrylic polymer having a Tg in the range of 35.degree.-100.degree. C.;
- (B) from 1-25 percent by weight based on weight of resin solids of a second carboxy group-containing material selected from the class consisting of aliphatic dicarboxylic acid containing from 4 to 20 carbon atoms per molecule and a polymeric polyanhydride including mixtures thereof wherein the polymeric polyanhydride is of the structure:
- ##STR4## where X equals hydrogen, methyl or ethyl and m equals 4 to 10 and n is a number such that the polymeric polyanhydride has a number average molecular weight of 400 to 2500;
- (C) a beta-hydroxyalkylamide curing agent;
- and
- (D) from 5-40 percent by weight based on weight of resin solids of an acid group-containing polymer selected from the class consisting of carboxylic acid group-containing polyesters, carboxylic acid group-containing polyurethanes and mixtures thereof;
- the equivalent ratio of beta-hydroxyalkylamide to carboxy functionality being within the range of 0.6 to 1.6:1.
Dependencies are inferred from the claim text.