Patent ID: 9115242
Filing Date: 2015-08-25
Classification: C08F,C08G,C09D

Abstract:
1. A copolymer obtained by free-radical copolymerization of one or more urethane-based, polysiloxane-containing macromonomers having only one free-radically polymerizable double bond and at least one or more further free-radically polymerizable monomers, wherein: the copolymer is a (meth)acrylate copolymer and the macromonomer(s) is/are obtainable by reaction of at least one hydroxy-functional (meth)acrylate and at least one polysiloxane-, polyether-polysiloxane-, polyester-polysiloxane- or polyether/polyester-polysiloxane-modified isocyanate, optionally in the presence of a catalyst for formation of the urethane bond and of at least one inhibitor of free-radical polymerization, and in that at least 85% of the monomers used for preparation of the copolymer have only one free-radically polymerizable double bond; wherein the copolymer has a weight-average molecular weight of 2000 to 100 000 g/mol; and wherein the at least one polysiloxane-, polyether-polysiloxane-, polyester-polysiloxane- or polyether/polyester-polysiloxane-modified isocyanate is purified prior to the reaction and has the general formula (II) in which all R′ and R X is alkylene, cycloalkylene or aralkylene, all Y are alkylene or cycloalkylene, n and m are independent of one another, where the sum of n+m =0 to 100, R all R all R s=1 to 400 and t=2 to 30.