| 摘要 |
PURPOSE: To produce a relief or flexographic printing plate capable of being stably stored and having a high Shore hardness. CONSTITUTION: This irradiation-polymerizable mixture consists of a thermoplastic elastomeric block copolymer expressed by (A-B)m -A, (B-A)m+1 -b, (A-B)m+1 or (A-B)o Y, where A is a thermoplastic non-elastomeric polymer block having >=25 deg.C glass transition temp., B is an elastomeric polymer block having <=10 deg.C glass transition temp., Y is Sn or Si, and (m) is an integer of 1 to 10, and (o) is 2 when Y is Sn and 4 when Y is Si, an ethylenic polyunsaturated compd. shown by formula 1, where R is straight-chain or branched alkyl, X is straight-chain alkylene or cycloalkylene, and the discrete methylene groups can be replaced by -O-, -S-, carbonyl or carbonyloxy group, and (n) is 1 to 5, and a photopolymerization initiator. |
