Photopolymerizable composition

A photopolymerizable composition developable with an alkali aqueous solution which comprises:

• (1) a carboxyl group-containing high polymer binder having the weight-average molecular weight of 5,000 to 2,000,000 in the amount of 40 to 90% by weight;
• (2) a photopolymerizable monomer in the amount of 10 to 60% by weight;
• (3) a photopolymerization initiator system comprising a lophine dimer in the amount of 0.1 to 20% by weight;
• and
• (4) at least one compound selected from the group consisting of compound represented by the general formulae (I), (II) and (III) in the amount of 0.1 to 10% by weight:
• wherein R.sup.1 to R.sup.10 may be either the same or different and each represents H, NR.sup.11.sub.2, OR.sup.11, SR.sup.11, COOR.sup.11, CN a halogen atom, NO.sub.2, CHO, SO.sub.3 R.sup.11, R.sup.11 CONHNH, R.sup.11 SO.sub.2 NH, an aryl group having 6 to 10 carbon atoms, an alkyl group having 1 to 10 carbon atoms, an aminoalkyl group having 1 to 10 carbon atoms, a hydroxyalkyl group having 1 to 10 carbon atoms, a carboxyalkyl group having 1 to 10 carbon atoms, an aralkyl group having 7 to 20 carbon atoms or a monophorino group;
• Y represents an alkylene group having 1 to 10 carbon atoms, an arylene group having 6 to 12 carbon atoms or an aralkylene group having 7 to 25 carbon atoms which may be substituted by NR.sup.11.sub.2, OR.sup.11, SR.sup.11, COOR.sup.11, CN, a halogen atom, NO.sub.2, CHO, SO.sub.3 R.sup.11, R.sup.11 CONHNH, R.sup.11 SO.sub.2 NH, or a monophorino group, and which may contain between two carbon atoms a bivalent intervenient group of pyperadine residue, COO, NR.sup.11, SO.sub.2, SO.sub.2 NR.sup.11, O, S, CONR.sup.11, CONHCO or COONR.sup.11 ;
• wherein R.sup.11 represents H, an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms.