Patent ID: 7074544

Claim:
A positive image recording material for use with an infrared laser comprising: a support; and, formed on the support a photosensitive/heat sensitive layer exhibiting increased solubility to an alkaline developer following exposure with an infrared laser and containing (A) an alkali-soluble resin, (B) a photothermal conversion substance, and (C) at least one compound selected from a group of compounds defined by the formulae (I), (II), (III), and (IV) wherein, in the formula (I): Ar represents an aryl group or an aromatic group containing a hetero atom; R 6 represents a hydrogen atom, a cyano group, an alkyl group, or an aryl group; R 7 represents an alkyl group or an aryl group; Y 1 and Y 2 may be the same as or different from each other and independently represent an alkyl, an aryl, an aralkyl, or an aromatic group containing a hetero atom; Y 1 and Y 2 may be bonded to each other to form a ring; Ar may be bonded with at least one of Y 1 and Y 2 to form a ring; Ar and R 6 may be bonded together to form a ring; X âˆ’ represents a non-nucleophilic anion; and the compound may comprise two or more groups defined by the formula (I) bonded together through linking groups at the positions Ar, R 6 or R 7 or at the positions of Y 1 or Y 2 ; and in the formulae (II) and (III): R 1 to R 3 may be same as or different from one another and independently represent a hydrogen atom, an alkyl, an alkenyl, an aryl, or an alkoxy group; R 4 and R 5 may be the same as or different from each other and independently represent a hydrogen atom, a cyano group, an alkyl, an aryl, or an alkoxy; Y 3 and Y 4 may be the same as or different from each other and independently represent an alkyl, an aryl, an aralkyl, or an aromatic group containing a hetero atom; n represents an integer of 1 to 4; if n is 2 or higher, a plurality of groups represented by R 1 and R 2 may be respectively the same as or different from each other; two or more groups represented by R 1 to R 5 , Y 3 and Y 4 may be bonded to form a ring structure; X âˆ’ represents a non-nucleophilic anion; and the compound may comprise two or more groups defined by the formulae (II) and (III) bonded together through linking groups at the position of R 1 to R 5 , Y 3 or Y 4 ; and in the formula (IV): Y 5 and Y 6 independently represent an alkyl, an aryl, an aralkyl, a heterocyclic group, an oxoalkyl, or an oxoaralkyl group; Y 5 and Y 6 may be bonded to each other to form a ring; Aa represents a single bond or an organic group; Ba represents a group having a â€”CON(Ra)â€” bond or a group having a â€”SO 2 N(Ra)â€” bond; Ra represents a hydrogen atom or an alkyl; m represents an integer of 1 to 3; and X âˆ’ represents a non-nucleophilic anion.