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    • 32. 发明授权
    • Thermally curable coating composition
    • 热固化涂料组合物
    • US5684083A
    • 1997-11-04
    • US445835
    • 1995-05-22
    • Rodger G. TempleHenry H. Crum, IIIJonathan T. Martz
    • Rodger G. TempleHenry H. Crum, IIIJonathan T. Martz
    • C08F290/14C08G18/81C09D4/06C09D175/16C08L75/04
    • C09D4/06C08F290/147C08G18/8158C09D175/16
    • A composition is disclosed which includes a urethane resin containing reactive ethylenically unsaturated groups and hydroxyl groups, which is preferably derived by reacting a polyisocyanate and an isocyanate reactive group-containing unsaturated monomer selected from the group consisting of hydroxyalkyl acrylates, hydroxyalkyl methacrylates, hydroxyalkyl acrylamides, hydroxy functional allylic compounds, and mixtures thereof to form an isocyanate group-containing reaction product which is then reacted with an organic polyol wherein the equivalent number of hydroxyl groups is in excess compared with the equivalent number of isocyanate groups. The composition also includes an aminoplast resin for reaction with hydroxyl groups on the urethane resin in an amount of less than about 10% by weight based on solids of the composition which is effective in thin film curing of the composition. The composition can also optionally include a thermally activated free radical initiator and a cure-promoting catalyst different from the free radical initiator; such as a metal soap. A method is also disclosed of applying a layer of the composition in which a portion of the layer is a thin film. The method is particularly useful in applying the composition to a substrate which is coated with a cationically electrodeposited primer. The composition and method of the invention are particularly useful for making a chip resistant coating and obtaining good cure at thin film layers of the composition.
    • 公开了一种组合物,其包含含有反应性烯键式不饱和基团和羟基的聚氨酯树脂,其优选通过使多异氰酸酯和选自异氰酸酯反应性基团的不饱和单体反应而得到,所述不饱和单体选自丙烯酸羟烷基酯,甲基丙烯酸羟烷基酯,羟烷基丙烯酰胺, 羟基官能的烯丙基化合物及其混合物,以形成含异氰酸酯基团的反应产物,然后与有机多元醇反应,其中相当数量的羟基与异氰酸酯基团的当量相比是过量的。 所述组合物还包括用于与氨基甲酸酯树脂上的羟基反应的氨基塑料树脂,其用量小于约10重量%,基于对组合物的薄膜固化有效的组合物的固体。 组合物还可以任选地包括热活化的自由基引发剂和不同于自由基引发剂的固化促进催化剂; 如金属皂。 还公开了施加一层该组合物的方法,其中该层的一部分是薄膜。 该方法在将组合物施加到用阳离子电沉积引物涂覆的基底上特别有用。 本发明的组合物和方法特别可用于制备耐芯片涂层并在组合物的薄膜层获得良好的固化。