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A photopolymerizable composition containing a polymerizable compound having an ethylenically unsaturated bond, a photopolymerization initiator, and if necessary, a linear organic hibh molecular weight polymer. The photopolymerization initiator comprises a combination of (a) at least one organic boro

A photopolymerizable composition containing a polymerizable compound having an ethylenically unsaturated bond, a photopolymerization initiator, and if necessary, a linear organic hibh molecular weight polymer. The photopolymerization initiator comprises a combination of (a) at least one organic boron compound anion salt of an organic cationic dye, andd (b) a compound represented by formula (I): [Figure] (I) wherein x represents a halogen atom; Y represents －CH3, －NH2, －NHR′, －N(R′)2, or －OR′wherein R′represents an alkyl group, a substituted alkyl group, an aryl group, or a substituted aryl group; and wherein R represents －CX3, an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group, or a substituted alkenyl group.

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A photopolymerizable composition comprising (i) a polymerizable compound having at least one ethylenically unsaturated bond and capable of being photopolymerized by active light in an amount such that a light-exposed portion thereof will separate from a light-unexposed portion thereof when treated w

A photopolymerizable composition comprising (i) a polymerizable compound having at least one ethylenically unsaturated bond and capable of being photopolymerized by active light in an amount such that a light-exposed portion thereof will separate from a light-unexposed portion thereof when treated with a developer, and (ii) a photopolymerization of said polymerizable compound, wherein said photopolymerization initiator contains (a) at least one organic boron compound anion salt of the organic cationic dye is a salt represented by formula (II): [Figure] (II) wherein D�represents a cationic dye; R1, R2, R3, and R4, which may be the same or different, each represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, or a substituted or unsubstituted heterocyclic group, and two or more of said R1, R2, R3 and R4 may combine with each other to form a cyclic structure; and (b) a compound represented by formula (I): [Figure] (I) wherein X represents a halogen atom; Y represents －CX3, －NH2, －NHR′, －N(R′)2, or －OR′wherein R′represents an alkyl group, a substituted alkyl group, an aryl group, or a substituted aryl group; and wherein R represents －CX3, an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group, or a substituted alkenyl group.