An improved high solids coating composition that contains at least 50% by weight of a binder of film-forming constituents in which the constituents are of
(A) an acrylic polymer that has a number average molecular weight of about 500-10,000, a hydroxyl content of at least 2% by weight and contains about 2-10% by weight of a chain transfer agent, and consists essentially of
an alkyl methacrylate,
a hydroxyalkyl acrylate, ora
hydroxyalkyl methacrylate; and
optionally, an alkyl acrylate
or styrene and
(B) an organic polyisocyanate cross-linking agent; the improvement used with this composition is the addition of select ultraviolet light stabilizers and optionally, antioxidants. The composition is particularly useful for clear coat/color coat exterior finishes for automobiles, trucks and airplanes.
一种改进的高固体份涂料组合物,它含有至少 50%(重量)成膜成分的粘结剂,其中的成膜成分是
(A)
丙烯酸聚合物,其平均分子量约为 500-10,000,羟基含量至少为 2%(按重量计),并含有约 2-10%(按重量计)的链转移剂,其主要成分为
甲基丙烯酸烷基酯、
丙烯酸羟烷基酯或
甲基丙烯酸羟烷基酯;以及可选的
丙烯酸烷基酯或
苯乙烯;以及
(B) 有机多
异氰酸酯交联剂;该组合物的改进之处在于添加了紫外线稳定剂和
抗氧化剂。该组合物尤其适用于汽车、卡车和飞机的透明涂层/彩色涂层外饰面。