A coating composition comprises a hydroxy component having at least two free hydroxyl groups per molecule and an anhydride component which is a polymer-containing cyclic carboxylic acid anhydride groups derived from an olefinically unsaturated cyclic carboxylic acid anhydride, the two components being packaged separately during storage of the composition and being compatible on mixing. At least one of the components is a film-forming polymer. The composition includes a catalytically effective amount of amine groups for accelerating the curing reaction between the hydroxyl groups and the anhydride groups. The amine groups are present in the molecule of the hydroxy component or in a separate amine compound. The hydroxy component is preferably a film-forming acrylic copolymer having pendent hydroxyl and dialkyl-amino-alkyl groups. The composition is particularly useful as a glossy pigmented coating for rigid substrates such as vehicle bodies where hardening of the coating at ambient temperature is required.
一种涂料组合物包括一种羟基组分,其每个分子至少有两个游离羟基;一种酸酐组分,其是一种聚合物,含有从烯烃不饱和
环羧酸酸酐衍生而来的
环羧酸酸酐基团,这两种组分在组合物储存期间分开包装,并在混合时相容。其中至少一种成分是成膜聚合物。组合物中包括催化有效量的胺基团,用于加速羟基和酸酐基团之间的固化反应。胺基团存在于羟基组分的分子中或单独的胺化合物中。羟基组份最好是具有下垂羟基和二烷基
氨基烷基的成膜
丙烯酸共聚物。该组合物特别适用于刚性基材(如车身)的光亮
颜料涂层,在这种基材上,涂层需要在环境温度下硬化。