Waterbased acrylic silane and polyurethane containing coating composition
AssigneeE. I. Du Pont de Nemours and Company
InventorsErvin R. Werner, Jr., Eileen E. Konsza
Life of this patent
Estimating the term…
Abstract
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.degree. to 25.degree. C. 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.
Claims21
A waterbased coating composition comprising about 10-30% by weight of film forming binder dispersed in an aqueous carrier and has a pH of about 7-10;
- wherein the binder consist essentially of about
- a. 60-90% by weight, based on the weight of the binder, of an acrylic silane polymer consisting essentially of polymerized monomers of alkyl methacrylate, alkyl acrylate or mixtures thereof, 1-10% by weight based on the weight of the acrylic silane polymer, of silane containing alkyl acrylate or methacrylate, sufficient monoethylenically unsaturated acid to provide the polymer with an acid number of 2-100 and sufficient hydroxy alkyl acrylate or hydroxy alkyl methacrylate to provide the polymer with a hydroxyl number of about 5-100, a glass transition temperature of -40.degree. to +25.degree. C. and a weight average molecular weight of 500,000 to 3,000,000 and the acid groups of the polymer are reacted with ammonia or an amine;
- b. 10-40% by weight, based on the weight of the binder, of the dispersed polyurethane selected from the group consisting of polyester urethane, polyether urethane or polyacrylourethane.
Dependencies are inferred from the claim text.