申请人:Ford Motor Company Limited
公开号:EP0029339A1
公开(公告)日:1981-05-27
A fast curing, coating composition that is adapted for use as an automotive topcoat and which upon curing forms a hard, glossy, durable coating exhibiting excellent resistance to solvents and water. The coating composition which may contain greater than about 55 percent by weight of nonvolatile solids and, exclusive of pigments, solvents and other nonreactive components, consists essentially of:
(A) a bifunctional copolymer bearing hydroxy functionality and pendent epoxy functionality, having a number average molecular weight (Mn) of between about 1500 to about 10.000 and a glass transition temperature (Tg) of between about -25° to about 70°;
(B) a reactive catalyst comprising at least one phosphonic acid derivative;
(C) an amino resin crosslinking agent; and
(D) optionally, a hydrcxy functional additive.
The phosphonic acid derivative catalyst is ncluded in the composition in an amount sufficient to provide between about 8 to about 1.4 equivalents of acid functionality in copolymer (A), and the amino resin crosslinking agent is Included in the composition in an amount sufficient to provide at least about .4 equivalents of nitrogen crosslinking functionality for each equivalent of hydroxy functionality included in the composition.
一种快速固化的涂料组合物,可用作汽车面漆,固化后可形成坚硬、光亮、耐久的涂层,具有优异的耐溶剂性和抗水性。该涂料组合物的非挥发性固体含量按重量计可超过 55%,除颜料、溶剂和其他非反应性成分外,主要由以下成分组成:
(A) 含有羟基官能团和下垂环氧官能团的双官能团共聚物,其平均分子量 (Mn) 在约 1500 到约 10.000 之间,玻璃化温度 (Tg) 在约 -25° 到约 70° 之间;
(B) 由至少一种膦酸衍生物组成的活性催化剂;
(C) 一种氨基树脂交联剂;以及
(D) 可选的水合官能添加剂。
膦酸衍生物催化剂在组合物中的用量足以在共聚物(A)中提供约 8 至约 1.4 个当量的酸官能度,氨基树脂交联剂在组合物中的用量足以为组合物中的每一个当量的羟基官能度提供至少约 0.4 个当量的氮交联官能度。