Coating composition based on polyurethane prepolymer and polyester resin, process for its preparation and its use for coating metallic surfaces

Abstract

Abstract 1. A coating composition consisting of a water soluble or dispersable organic binding agent and a solvent mixture, characterized in that the organic binding agent which is contained in the coating composition in an amount of from 15 to 60 wt.-% is a mixture of : (a) 40 to 90 wt.-% carboxyl group containing polyurethaneprepolymer with blocked isocyanate groups, and (b) 60 to 10 wt.-% hydroxyl group and carboxyl group containing polyester resin, and in that the solvent mixture is a mixture of : (a) water, (b) 10 to 90 wt.-% monovalent aliphatic alcohol, and/or (c) 10 to 90 wt.-% polyvalent aliphatic alcohol, and having a pH value of from 6.5 to 10.5.

Inventors

• 👤 Giacomo Terziari

Bibliographic Details