Powder coating composition comprising a co-reactable particulate mixture of carboxylic acid group-containing polymers and beta-hydroxyalkylamide curing agent
AssigneePPG Industries, Inc.
InventorsPaul H. Pettit, Jr., Debra L. Singer, 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 bland 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 a carboxylic acid group-containing acrylic polymer, a second carboxylic acid group-containing polyurethane having sufficient crystallinity to assist in flow of the powder coating compositions, a beta-hydroxyalkylamide crosslinking agent and an amorphous acid group-containing polyurethane.
Claims7
A thermosetting powder coating composition comprising a co-reactable particulate mixture of:
- (a) 35 to 85 percent by weight of the entire composition based on resin solids of a carboxylic acid group-containing acrylic polymer having a Tg in the range of about 35.degree. C. to 100.degree. C.;
- (b) from about 1 to 25 percent by weight of the entire composition based on weight of resin solids of a carboxylic acid group-containing polyester having a number average molecular weight of from about 300 to about 1500 and an acid equivalent weight of from about 150 to about 750, said polyester being crystallinear at temperatures under 50.degree. C. for assisting flow of the powder coating composition;
- (c) a beta-hydroxyalkylamide curing agent, the equivalent ratio of beta-hydroxyalkylamide equivalents to carboxylic acid equivalents being within the range of about 0.6 to 1.6:1 and
- (d) an amorphous acid group-containing polymer comprising a carboxylic acid group-containing polyurethane.
Dependencies are inferred from the claim text.