Parkhurst, Wendel & Rossi
Photosensitive flexographic printing plate composition
 The disclosed photosensitive flexographic printing plate composition is to impart a soft printing plate by rubber compounding photosensitive resin which comprises PA0 (A) 5-50 wt % of a photopolymerizable prepolymer consisting essentially of a component having the general formula ##STR1## where, R is an alkylene group or polyoxyalkylene group having 2-8 carbons, R.sub.1 is an H or CH.sub.3 group, R.sub.2 and R.sub.3 are diisocyanate residues, R.sub.4 is a portion excluding a hydroxyl group of dienic liquid rubber having a hydroxyl group of dihydric alcohol having less than 2000 molecular weight of the general formula ##STR2## where, R.sub.5 is an alkylene group having 2-8 carbons, R.sub.6 and R.sub.7 are an H, CH.sub.3 or acryloyloxy, methacryloyloxy, allyloxy group, X is a residue excluding hydroxyl group(s) of a dienic liquid rubber having hydroxyl group(s), l is an integer of 1-4, m is 1<m<4, and n is an integer of 1-16, PA0 (B) 35-65 wt % of styrene butadiene rubber containing 20-30 wt % of styrene, PA0 (C) 25-55 wt % of a styrene butadiene block copolymer or styrene isoprene block copolymer containing 11-37 wt % of styrene, PA0 (D) 0-15 wt % of a liquid prepolymer selected from polybutadiene having 1000-5500 molecular weight, a butadiene-styrene copolymer and their derivative, PA0 (E) 3-50 wt % of a photopolymerizable monomer having one or more than one photopolymerizable ethylene bonds, and PA0 (F)0.5-30 wt % of a photpolymerization initiator. The printing with high precision can easily be carried out with the use of the composition and a deep and sharp relief pattern can be formed by existing a special photosensitive oligomer and polymer component having a rubbery skeleton. 
Hayakawa Rubber Co., Ltd. Nippon Paint Co., Ltd.
Y G C
Y10S G03F C08F
additional inventional inventional
Ban Sadayoshi Kosaku Toshihiro
Tanaka Nakatsukasa Yamada Fujii