| 摘要 |
A (powder) coating composition comprises an epoxy-functional polyester storage-stable at temperatures of up to 40° C. and having a Tg of more than 40° 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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