Photopolymerizable composition containing salts of organic cationic dyes and organic boron compounds

A photopolymerizable composition which comprises a polymerizable compound having ethylenic unsaturated bonds, and a salt formed by an organic cationic dye compound (D.sym.) and an organic boron compound anion, which is represented by the following formula (I):

• ##STR50## wherein D.sym. represents a cationic dye compound, and R.sup.1, R.sup.2, R.sup.3 and R.sup.4, which may be the same or different, each represents an alkyl group, an aryl group, an aralkyl group, an alkaryl group, an alkenyl group, an alkinyl group, a alicyclic group, a heterocyclic group, an allyl group, or a group having carbon atoms less than 18, selected from the derivatives of these groups, and wherein two or more of the substituent groups R.sup.1 to R.sup.4 may combine with each other to form a cyclic structure, said organic cationic dye compound (D.sym.) being represented by the following formula (II):
• ##STR51## wherein E represents an auxochrome;
• L represents a methine group, which may be in the 4-, 5-, 6-, 7- or 8-position;
• V.sub.1, V.sub.2, V.sub.3, V.sub.4 and V.sub.5, which may be the same or different, each represents a hydrogen atom, a halogen atom, an unsubstituted or substituted alkyl group, an acyl group, an acyloxy group, an alkoxycarbonyl group, a carbamoly group, a sulfamoyl group, a carboxy group, a cyano group, a hydroxyl group, an amino group, an acylamino group, an alkoxy group, an alkylthio group, an alkylsulfonyl group or an aryl group, and any two of V.sub.2 to V.sub.5 attached to two adjacent carbon atoms may combine with each other to form a condensed ring;
• and Y is a carbon atom represented by the formula ##STR52## wherein V has the same meaning as V.sub.1 to V.sub.5 or a nitrogen atom represented by --N.dbd., and Z is a chalcogen atom or a nitrogen atom represented by the formula ##STR53## wherein R.sub.11 represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a heterocyclic group.