Patent ID: 7291443

Claim:
A negative-working polymerizable composition comprising: a dye which is soluble in an organic solvent and in an alkaline aqueous solution and has an absorption at a range of 700 to 1200 nm, the dye having a methyl ester group, which is a carboxylate ester; a radical polymerization initiator; a compound having an ethylenically unsaturated bond; and a binder polymer which is substantially soluble in the alkaline aqueous solution and insoluble in water, wherein the radical polymerization initiator is an onium salt represented by the following formulae (RI-III): wherein R 31 , R 32 and R 33 each independently represents an aryl group substituted by a halogen atom; and Z 31 represents a monovalent anion and is a halide ion, a perchlorate ion, a hexafluorophosphate ion, a tetrafluoroborate ion, a sulfonate ion, a sulfinate ion, a thiosulfonate ion or a sulfate ion.