AQUEOUS COATING CONTAINING A FILM-FORMING BINDER WHICH CONSISTS OF ACRYLIC POLYMER CONTAINING SILANE GROUPS AND A URETHANE POLYMER; COATED SUBSTRATE AND A PROCESS FOR FORMING THE COATED SUBSTRATE

摘要

A waterbased coating composition containing about 10-30% by weight of film forming binder dispersed in an aqueous carrier; wherein the binder contains a. an acrylic silane polymer of polymerized monomers of alkyl methacrylate, alkyl acrylate or mixtures thereof, a silane containing alkyl acrylate or methacrylate and the polymer has an acid no. of 2-100 and a hydroxyl no. of up to 100, a glass transition temperature of -40 to 25C and a weight average molecular weight of 500,000 to 3,000,000; and b. a polyurethane selected from the following group: polyester urethane, polyether urethane or polyacrylourethane; the composition is useful for painting and refinishing the exterior of automobiles and trucks.