Patent ID: 6251985
Filing Date: 2001-06-26
Classification: C08G,C09D

Abstract:
A method of making an aqueous coating composition which comprises combining(i) a polyol component selected from the group consisting of polyester, polyacrylate and polyester polyacrylate polyols having a hydroxyl group content of from about 1.0 to about 6.0 wt %, a carboxyl group content from about 0 to about 1.5 wt %, a weight average molecular weight of 2000 to 50000 and a glass transition temperature that is .gtoreq.30.degree. C.; and(ii) a polyisocyanate component comprising a member selected from the group consisting of aliphatic isocyanates and cycloaliphatic isocyanates having a blocked isocyanate group content of from about 10.0 to about 25.0 wt %,to form an organic phase and subsequently forming said aqueous coating composition by dispersing the organic phase in the aqueous phase by a direct dispersing process by means of a dispersing device having a volume-related dispersing power of 1.times.10 to 9.8.times.10000 W/cm.sup.3.