AQUEOUS PRIMER COMPOSITION FOR CHIPPING-RESISTANT COATING FILM AND CHIPPING-RESISTANT COATING FILM USING THE SAME

摘要

PURPOSE: To obtain the subject composition comprising a carboxyl group- containing polyurethane emulsion, a polyaziridine compound and a metal chelate compound, having no problem on safety and environmental pollution, and giving coating films excellent chipping resistance. ;CONSTITUTION: The objective composition comprises (A) a carboxyl group- containing polyurethane emulsion, (B) a polyaziridine compound (e.g. tri-1- aziridinyl phosphineoxide) and/or (C) a chelate compound [preferably zinc di(acetylacetonate)]. The component A is preferably an emulsion produced by emulsifying an excessively NCO group-containing prepolymer in the presence of a monoamine in water, the prepolymer being produced by polymerizing an aliphatic polyisocyanate and/or an alicyclic polyisocyanate, a polymeric polyol, dimethylol alkane and, if necessary, a chain extender. The composition containing the component C can preferably be used as a one pack type primer composition because of having more excellent storage stability than the composition containing the component B.;COPYRIGHT: (C)1994,JPO&Japio