Aqueous composition of two-component polyurethane coating process for its preparation and its use in the production methods of a multilayer paint system

摘要

PCT No. PCT/EP95/04234 Sec. 371 Date Jul. 3, 1997 Sec. 102(e) Date Jul. 3, 1997 PCT Filed Oct. 28, 1995 PCT Pub. No. WO96/14348 PCT Pub. Date May 17, 1996The present invention relates to an aqueous two-component polyurethane coating composition comprising A) a water-dilutable polyacrylate resin (A) having an OH number of from 40 to 200 and an acid number of from 20 to 100 mg of KOH/g, and B) a polyisocyanate component, characterized in that the water-dilutable acrylate resin is obtainable by solution polymerization of at least one ester of (meth)acrylic acid and a cycloaliphatic C6 to C10 alcohol, with the exception of cyclohexyl methacrylate, at least one hydroxyl-containing monomer, if desired, at least one vinyl ester of alpha -branched monocarboxylic acids having 5 to 18 carbon atoms per molecule and/or at least one reaction product of acrylic acid and/or methacrylic acid with the glycidyl ester of alpha -branched monocarboxylic acids having 5 to 18 carbon atoms per molecule, at least one carboxyl-containing monomer and, if desired, further, essentially carboxyl-free monomers, the resulting polyacrylate resin being at least partially neutralized and dispersed in water.