Patent ID: 6177535
Filing Date: 2001-01-23
Classification: C08G,C09D

Abstract:
A process for preparing radiation-curable, urethane-functional prepolymers PU, the process comprisingreacting an isocyanate-functional component A with an OH-containing component B, whereinthe component A comprises at least one trifunctional isocyanate compound A1 with or without one or more difunctional isocyanate compounds A2;the OH-containing component B comprises at least one ethylenically unsaturated compound B1 having at least one reactive OH group with or without different OH-containing compounds B2; andeither component A1 embraces at least two different isocyanate compounds A1a and A1b in a weight ratio of 1:3 to 3:1 or component A embraces one isocyanate compound A1 and at least one isocyanate compound A2 in a molar ratio of 10:1 to 1:5,wherein the compound A1 is selected from the group consisting of cyanurate of hexamethylene diisocyanate, cyanurate of isophorone diisocyanate biuret of hexamethylene diisocyanate, and biuret of isophorone diisocvanate.