Mixed and hybrid blocked polyisocyanates as cross linking agents in coating compositions, having at least one 1,3-dicarbonyl blocking group and at least one thermally active blocking group such that the molar ratio of 1,3-dicarbonyl blocking groups to thermally active blocking groups is in the range of from 4:1 to 1:9, offer improved intercoat adhesion when overcoated and good stability.
混合和杂化阻化聚
异氰酸酯作为涂料组分中的
交联剂,具有至少一个1,3-二酮阻化基和至少一个热活性阻化基,使得1,3-二酮阻化基与热活性阻化基的摩尔比在4:1到1:9的范围内,提供了在涂覆上层涂料时改善的层间附着力和良好的稳定性。