The present invention provides a curable resin composition having good curability and storage stability, which provides a cured film having excellent weather resistance, acid resistance and mar resistance. The curable resin composition comprises:
(a) 20 to 80% by weight of a polycarboxylic acid having an acid value of 25 to 300 mg KOH/g based on solid and a number average molecular weight of 500 to 20000; and
(b) 20 to 80% by weight of a polyepoxide having an epoxy equivalent of 100 to 800 and a number average molecular weight of 500 to 20000, prepared by copolymerizing: (1) 10 to 60% by weight of a long-chain epoxy monomer; and (2) 40 to 90% by weight of an ethylenically unsaturated monomer having no epoxy group. The present invention also provides a process for forming a cured film using the resin composition.
本发明提供了一种具有良好固化性和储存稳定性的可固化
树脂组合物,其固化膜具有极佳的耐候性、耐酸性和耐磨性。这种可固化
树脂组合物包括
(a) 20%至 80%(按重量计)的聚
羧酸,其酸值为 25 至 300 毫克 KOH/克(以固 体计),平均分子量为 500 至 20000;以及
(b) 20-80%(重量)的聚
环氧化物,其环氧当量为 100-800,平均分子量为 500-20000,其制备方法为:(1)10-60%(重量)的长链环氧单体;和(2)40-90%(重量)的无环氧基的
乙烯基不饱和单体共聚。本发明还提供了一种使用该
树脂组合物形成固化薄膜的工艺。