| 摘要 |
1450288 Photopolymerizable compositions UPJOHN CO 26 June 1974 [27 July 1973] 28275/74 Heading C3P [Also in Division G2] Photopolymerizable compositions suitable for forming relief images comprise (a) an addition polymerizable ethylenically unsaturated compound having a boiling point above 100‹ C., (b) a free radical initiator activatable by actinic radiation, and (c) a compatible polyurethane binding agent comprising the reaction product of (i) 4,4<SP>1</SP>-methylenebis-(phenylisocyanate), (ii) a polycaprolactone diol having a molecular weight of from 1000 to 2500 and (iii) a mixture of at least two different aliphatic diols having 2 to 6 carbon atoms, the ratio of equivalents of (ii) to total equivalents of (iii) being from 1:1À5 to 1 : 7, and the ratio of equivalents of (i) to total equivalents of (ii) and (iii) being from 0À94 : 1 to 0À98 : 1. In examples component (a) is trimethylolpropane trimethacrylate and component (b) is benzophenone.
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