Patent ID: 6811951
Filing Date: 2004-11-02
Classification: G03F

Abstract:
A photosensitive constituent for a flexographic printing plate Comprising a polyester film as support (B) and a photosensitive elastomer composition (C) and having an adhesive layer (A) therebetween,wherein the photosensitive elastomer composition (C) comprises, as essential components, (a) 50% by weight or more of at least one thermoplastic elastomer comprising a mono-vinyl-substituted aromatic hydrocarbon and a conjugated diene, (b) 5 to 40% by weight of at least one diene-based liquid rubber, (c) 1 to 20% by weight of at least one ethylenically unsaturated compound having 2 unsaturated bonds within its molecule, and (d) 0.1 to 3% by weight of at least one photopolymerization initiator, wherein (1) the thermoplastic elastomer has an average ratio of vinyl bond units in conjugated diene segments thereof of 10 to 20 mol % and (2) the liquid rubber has a number average molecular weight (Mn) of 500 to 5,000 and an average ratio of vinyl bond units of 50 to 70 mol %, and wherein the ethylenically unsaturated compound (a) having 2 unsaturated bonds comprises a compound represented by formula wherein n ranges from 9 to 16.