Patent ID: 9708515
Date: 2017-07-18
CPC Classifications: C08F,C09J

Claim:
1. Process for the preparation of a radiation curable composition comprising at least one (meth)acrylic copolymer A and at least one radiation curable compound B, said process comprising: (a) in a first copolymerization step, the preparation of a (meth)acrylic copolymer in the presence of at least one non-copolymerizable cyclic compound (b1) containing at least one  group in the cycle where X═O or NH, by copolymerization of a monomer mixture M comprising: (b) in a subsequent ring opening step, the preparation of the radiation curable compound B by the ring opening of the cyclic compound (b1) with at least one radiation curable compound (a5) that contains at least one hydroxyl, carboxylic acid, amine, or thiol functional group, wherein the percentages by weight are herein relative to the total weight of the monomer mixture M and the composition after radiation curing is a viscoelastic material which remains permanently tacky.