Patent ID: 6437041
Filing Date: 2002-08-20
Classification: C08G,C09D

Abstract:
An aqueous coating agent comprising an aqueous binder dispersion and optionally organic solvents, cross-linking agents, pigments, fillers, conventional lacquer additives and additional binders, wherein the aqueous binder dispersion consists of a polyurethane/polymer hybrid polymer, wherein said hybrid polymer(a) has a ratio by weight of polyurethane fraction to polymer fraction of 0.1:1 to 50:1, (b) a hydroxyl value of 0 to 150 mg KOH/g, with respect to the solid resin but excluding hydroxyl groups bonded to silicon, (c) an acid value of 1.5 to 60 mg KOH/g, with respect to the solid resin, (d) a concentration of 0.5 to 300 mmol of silicon per 100 g of solid resin and associated with the polyurethane fraction of the hybrid polymer and consisting of siloxane bridges of the formula incorporated into the polyurethane fraction, wherein said silicon concentration is obtained by polymerization of olefinic unsaturated monomers in the presence of polyurethane resins; said polyurethane resins do not contain olefinic double bonds and do contain silicon in the form of siloxane bridges of the formula â€”Siâ€”Oâ€”Siâ€”.