Importance

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Abstract

The disclosed photosensitive flexographic printing plate composition is to impart a soft printing plate by rubber compounding photosensitive resin which comprises (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

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First Claim