Corina Bisog

US Patent:

20050282990, Dec 22, 2005

Filed:

Jun 18, 2004

Appl. No.:

10/871891

Inventors:

Rainer Schoenfeld - Duesseldorf, DE
Corina Bisog - Franklin WI, US
David Sturgill - Brookfield WI, US
Kazuhiko Sato - Franklin WI, US

International Classification:

C08G018/00

US Classification:

528044000

Abstract:

Blocked polyurethane prepolymers obtained by reacting at least one polyol, a first polyisocyanate comprising diphenylmethane diisocyanate, a second polyisocyanate having a viscosity at 25 C. of less than about 250 mPa.s, a phenol blocking agent, and an oxime blocking agent, wherein the weight ratio of second polyisocyanate:first polyisocyanate is not more than 0.65:1. The blocked polyurethane prepolymers are especially useful in formulating coating compositions additionally comprising at least one acrylic resin, at least one plasticizer, at least one filler, and optionally other ingredients and additives. A cured coating is obtained by applying a layer of the coating composition to a substrate surface and heating the coating composition layer.