Powder coating composition of semi-crystalline polyester and curing agent
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United States of America Patent
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Feb 6, 2001
Grant Date -
N/A
app pub date -
May 19, 1995
filing date -
Mar 26, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A thermosetting powder coating composition according to the present invention comprises as binder a co-reactable particulate mixture of a carboxylic acid-functional polyester component and a curing agent having groups reactive with carboxylic acid groups, characterized in that the carboxylic acid-functional component comprises a semi-crystalline polyester having an acid value of from 10 to 70 mg KOH/g and a hydroxy value of no more than 11 mg KOH/g. Generally the semi-crystalline polyester has one or more Tg values less than 55.degree. C., a sharp melting point of 50 to 200.degree. C. and preferably a number average molecular weight of at least 1600. The composition may, if desired, include an amorphous polyester and the curing agent may be, for example, an epoxy resin or a bis(beta-hydroxyalkylamide).
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