Patent ID: 6579661
Filing Date: 2003-06-17
Classification: B41M,G03F,Y10S

Abstract:
A photopolymerizable composition comprising:a) at least one elastomeric binder, b) at least one ethylenically unsaturated monomer, and c) a photoinitiator or photoinitiator system, characterized in that the at least one elastomeric binder comprises at least one radial (polystyrene-polybutadiene)nX block copolymer, with X=Sn or Si and n=4, with an average molecular weight (Mw) of 80,000-300,000, a molecular weight distribution (Mw/Mn) of 1.00-1.40, a content of di-block copolymers of less than 15% by weight based upon the total weight of the polymer, which is extended with a paraffinic oil which must be present up to 50% by weight based upon the total weight of the polymer and paraffinic oil, wherein the durometer of the non-photopolymerized composition has a Shore A hardness &gE;20 and the durometer of the photopolymerized composition has a Shore A hardness &lE;40.