Patent ID: 7939598
Filing Date: 2011-05-10
Classification: C08G,C09D,Y10T

Abstract:
1. Process for preparing polyisocyanate mixtures comprising cycloaliphatic structural elements and also linear-aliphatically attached free isocyanate groups, the process comprising reacting: A) a polyisocyanate component having an average functionality of 2.0 to 5.0 and a linear-aliphatically attached isocyanate group content (calculated at NCO; molecular weight=42) of 8.0% to 27.0% by weight with B) 2 to 80% by weight, based on the total amount of components A) and B), of at least one hydroxyurethane which is based on a cycloaliphatic di- and/or polyisocyanate, is free from isocyanate groups, optionally contains urea groups, has a number-average molecular weight of 260 to 8000 g/mol and has an average OH functionality of 1.0 to 6.0 wherein the linear-aliphatically attached isocyanate group content of the resultant polyisocyanate mixtures is 4.0 to 26.0% by weight and the average NCO functionality is 1.9 to 8.0.