Photo-polymerizable composition

Claim 1

A photo-polymerizable composition which comprises: a thermoplastic polymeric binder; a non-gaseous ethylenically unsaturated compound; a photo-polymerization initiator system comprised of 4,4'-bis(dialkylamino)benzophenone, aromatic ketone and lophine dimer; an organic halogen compound; and a leuco dye, wherein said organic halogen compound is selected from the compounds represented by the following formulae IIIa to IIIe: ##STR7## wherein A 1 r represents a substituted or unsubstituted phenyl or a substituted or unsubstituted naphthyl group, and Z represents a chlorine atom or a bromine atom; ##STR8## wherein A 2 r represents a substituted or unsubstituted aryl group, W represents a hydrogen atom or a C 1 to C 20 alkyl or a C 6 to C 20 aryl group, and Z represents a chlorine atom or a bromine atom; A.sup.3 r--SO.sub.2 CZ.sub.3 IIIc wherein A 3 r represents a substituted or unsubstituted phenyl or a substituted or unsubstituted naphthyl group, and Z represents a chlorine atom or a bromine atom; ##STR9## wherein Z represents a chlorine atom or a bromine atom; and ##STR10## wherein R 2 represents CZ 3 or a substituted or unsubstituted phenyl or a substituted or unsubstituted naphthyl group, R 3 represents CA 3 , NH 2 , NHR 4 , N(R 4 ) 2 , SR 4 , OR 4 or R 4 , R 4 represents a C 1 to C 20 alkyl, a C 6 to C 20 aryl or a C 2 to C 20 alkenyl group, and Z represents a chlorine atom or a bromine atom.