| 摘要 |
PURPOSE: Film forming binders for coating compositions, coating compositions, particularly high solids coating compositions, comprising such binders, a process for the curing of such coating compositions, and the use of such coating compositions on substrates are provided. CONSTITUTION: A film forming binder comprises: (1) 45 to 99 wt.% of a polyester polyol comprising cycloaliphatic moieties, and (2) 55 to 1 wt.% of a polyurethane polyol comprising cyclic moieties, with the proviso that the Tg of the polyurethane polyol is higher than the Tg of the polyester polyol. Wherein the Tg of the polyester polyol ranges from -20 to 20°C and the Tg of the polyurethane polyol ranges from 10 to 100°C. The branched polyester polyol is the reaction product of (a) at least one cycloaliphatic polycarboxylic acid or derivatives thereof, (b) at least one C312 triol, and (c) optionally, one or more monoalcohol, polyol, aromatic polycarboxylic acid, acyclic aliphatic polycarboxylic acid, monocarboxylic acid or glycidyl ester of monocarboxylic acid. |
