Patent ID: 6359080
Filing Date: 2002-03-19
Classification: C08G,C09D,Y10S

Abstract:
A curable outdoor durable coating composition, comprising:an epoxy functional polyester resin, which is storage stable at temperatures up to 40Â° C., has a Tg of more than 40Â° C., and a cross linking resin, wherein the epoxy functional polyester resin is produced by a process, comprising: reacting an intermediate epoxy functional polyester resin (III) produced by glycidating a first carboxyl functional polyester resin produced by reacting: at least one aromatic or cycloaliphatic dicarboxylic acid compound A comprising two aromatic or secondary aliphatic carboxyl groups or the anhydride thereof; at least one diol compound B comprising two aliphatic hydroxyl groups, which independently are a primary or a secondary hydroxyl group; optionally compound C1 comprising one mono-functional primary or secondary hydroxyl group and optionally compound C2 comprising one primary or secondary hydroxyl group and one tertiary aliphatic carboxyl group; optionally a dihydroxymonocarboxylic acid compound D comprising a tertiary aliphatic carboxyl group and two aliphatic hydroxyl groups, which independently are primary or secondary hydroxyl; and optionally a trihydroxyalkane (E1) or tetrahydroxyalkane (E2), the molar ratio of compounds A:B:C1:C2:D:E1:E2 being X+Y+1:X:M:N:Y:Z:Q; wherein M+N is in the range of from 0 to 2, X ranges from 2 to 8, Y ranges from 0 to 8, Z ranges from 0 to 2, and Q ranges from 0 to 2 at a temperature of from 100 to 220Â° C., until essentially all the non-tertiary carboxyl groups as initially present in the reaction mixture have been reacted, the intermediate epoxy functional polyester resin having a WPE in the range of from 250 to 800; with (IV) one member selected from the group consisting of a second carboxyl functional polyester derived from dicarboxylic acid or anhydride (a) and diol (b), and dicarboxylic acid or anhydride (a) alone.