COATING COMPOSITIONS

摘要

A chipping resistant polyurethane coating composition which comprises: (a) a polyisocyanate blocked with an oxime or a lactam or a polyurethane prepolymer having terminal isocyanate groups blocked with an oxime or a lactam; (b) a polyaminepolyetherpolyester which is a condensate of a polyaminepolyether and an organic carboxylic acid, the polyaminepolyether being an adduct of an oxirane compound to a polyamine compound, a polyamidepolyaminepolyether which is an adduct of an oxirane compound to a polyamidepolyamine, the polyamidepolyamine being a condensate of a polyamine and an organic carboxylic acid; or a mixture of the polyaminepolyetherpolyester and the polyamidepolyaminepolyether. The composition in which an aromatic polyisocyanate or its prepolymer blocked with an oxime is curable at temperatures of about 90-110.degree.C.