Photopolymerizable composition with adhesion improving additive

Claim 1

A photopolymerizable composition which comprises (1) a non-gaseous ethylenic unsaturated compound which has at least two ethylenic unsaturated groups and forms a polymer by the aid of a photopolymerization initiator, (2) a thermoplastic organic polymer binder, (3) a photopolymerization initiator which is activated by activating light, and (4) an adhesion improving additive with respect to a metal surface, the adhesion improving additive being a derivative of a thiohydrazide as represented by formula (I) or at least one derivative of a carbothio acid amide as represented by formula (II) or formula (III): ##STR3## wherein R 1 , R 2 and R 3 each represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, an acyl group, or an aralkyl group; and they may be the same or different from one another and they may form a ring ##STR4## wherein R 4 and R 5 each represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, or an aralkyl group; and they may be the same or different from each other, ##STR5## wherein R 6 and R 7 each represents the same group as defined for R 4 and R 5 ; R 8 represents an alkylene group, an arylene group or a heteroarylene group; and n denotes 0 or 1, and wherein the amount of ingredient (1) is 10 to 500 parts by weight per 100 parts by weight of ingredient (2), the amount of ingredient (3) is 0.1 to 20 parts by weight per 100 parts by weight of ingredient (1), and the amount of ingredient (4) is 0.0005 to 5% by weight based on the weight of the photopolymerizable composition.