Powder coating of glycidyl-functional copolymer, dicarboxylic acid and acid-functional polyester
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United States of America Patent
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May 8, 2001
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N/A
app pub date -
Nov 11, 1998
filing date -
Dec 24, 1997
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Expired
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Abstract
A curable powder coating composition comprises (a) a copolymer produced from ai) 5 to 10 wt % of a C.sub.1 to C.sub.4 alkyl diester of an ethylenically unsaturated dicarboxylic acid, aii) 10 to 45 wt % of a glycidylester of an ethylenically unsaturated carboxylic acid, aiii) 10 to 35 wt % of an alkenyl ester of a branched tertiary carboxylic acid wherein the acid moiety contains nine carbon atoms, and aiv) 0 to 45 wt % of a C.sub.1 to C.sub.12 alkyl ester of an ethylenically unsaturated carboxylic acid having from 3 to 4 carbon atoms in the acid moiety, the percentages of ai) to av) are relative to the total weight of the polymer adding up to 100%; and (b) a blend comprising (bi) C.sub.4 to C.sub.16 (cyclo)aliphatic dicarboxylic acid and (bii) a polyester resin having an acid value of from 4500 to 4900 mmole/kg produced from a C.sub.5 to C.sub.12 branched polyhydroxyalkane and a C.sub.4 to C.sub.16 (cyclo)aliphatic dicarboxylic acid or anhydride in a polyhydroxyalkane:dicarboxylic acid molar ratio of from 0.2:1 to 0.4:1, blend (b) having an acid value of from 5000 to 10,000 and the acid:epoxy molar ratio being from 0.70:1 to 1.10:1.
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