Patent ID: 8729259
Filing Date: 2014-05-20
Classification: C08G,C09D

Abstract:
1. A process for preparing at least one low-monomer-content 1:1 adduct of at least one hydroxyalkyl(meth)acrylate and at least one diisocyanate, the process comprising: (1) reacting a uretdione-group-comprising dimer of a diisocyanate with a hydroxyalkyl(meth)acrylate, with complete reaction of the free NCO groups, in a ratio of free NCO groups to OH groups of 1:1.0 to 1.3, to give a first product; and (2) heating the first product from (1) to a temperature in a range of 100 to 240° C., thereby cleaving at least one uretdione group to form the 1:1 adduct.