Compsns. suitable for the prodn. of photographic images, engraving plates, laminates, impregnated products, coatings, printed circuits, are obtained by adding a known photopolymerising initiator, e.g. benzophenone, benzoin-Me-ether, etc., to a cpd. contg. pref. per mean mol.wt. of 100, 0.01-1 urethane linkages, 0.001-1 sec. or tert.-amino gps. or urea linkages and 0.02-1 ethylenically unsatd. double bonds (A) or to a mixture of a cpd. contg. pref. per mean mol.wt. of 100 the same no. of urethane linkages and double bonds as above (B) and a cpd. contg. =1 sec. or tert.-amino gp. or urea linkage, so that per 100 pts. of B there are =0.01 pt. amino N or 0.03 pt. urea N. The initiator is added at 0.001-10 wt.%.
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