Photopolymerizable composition containing a sensitizing dye and a titanocene compound

A photopolymerizable composition comprising:

• (a) an addition polymerizable compound having at least one ethylenically unsaturated double bond;
• (b) a sensitizing dye represented by the following formula (I);
• and (c) a titanocene compound:
• ##STR47## wherein R.sup.1 and R.sup.2, which are the same or optionally are different, each represents a hydrogen atom, an alkyl group, a substituted alkyl group, an alkenyl group, a substituted alkenyl group, an alkoxycarbonyl group, an aryl group, a substituted aryl group, an alkynyl group or a substituted alkynyl group;
• A represents an oxygen atom, a sulfur atom, a carbon atom substituted by an alkyl group or an aryl group or a carbon atom substituted by two alkyl groups;
• X represents a nonmetallic atom group necessary for forming a nitrogen-containing heterocyclic 5-membered ring;
• Y represents a phenyl group, a substituted phenyl group or an unsubstituted or substituted heteroaromatic ring;
• Z represents a hydrogen atom, an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group, an alkoxy group, an alkylthio group, an arylthio group, a substituted amino group, an acyl group or an alkoxycarbonyl group;
• and
• Z and Y optionally are combined with each other to form a ring.