Coating of epoxy-functional polyester advanced with polyester or acid (anaydride)
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United States of America Patent
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Mar 19, 2002
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app pub date -
May 16, 2000
filing date -
Nov 11, 1998
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Abstract
A (powder) coating composition comprises an epoxy-functional polyester storage-stable at temperatures of up to 40.degree. C. and having a T.sub.g of more than 40.degree. C. and a crosslinking resin, wherein the epoxy-functional polyester is prepared by the reaction of (III) an intermediate epoxy-functional polyester produced by glycidating a carboxyl-functional polyester derived from (a) secondary carboxyl groups-containing aromatic or cycloaliphatic dicarboxylic acid (anhydride)(s), (b) aliphatic hydroxyl groups-containing diol(s), (c) optionally, a compound containing one primary or secondary hydroxyl group, or a compound comprising one primary or secondary hydroxyl group and one tertiary aliphatic carboxyl group, (d) optionally, a compound comprising a tertiary aliphatic carboxyl group and two aliphatic hydroxyl groups and (e) optionally, a trihydroxyalkane or tetrahydroxyalkane; with (IV) a carboxyl-functional polyester obtained from (a) and (b) above, or (a) alone.
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