COLOR DEVELOPING COMPOSITION, LITHOGRAPHIC PRINTING PLATE PRECURSOR, PLATE MAKING METHOD FOR LITHOGRAPHIC PRINTING PLATE, AND COLOR DEVELOPER

摘要

An object of the present invention is to provide a color developing composition which develops colors in a high density and does not significantly discolor when aged, a lithographic printing plate precursor which has excellent plate-inspecting properties by means of color development and is capable of maintaining strong color development even when aged after color development, a plate making method for a lithographic printing plate in which the lithographic printing plate precursor is used, and a new compound that can be preferably used as a color developer.;The color developing composition of the present invention includes a compound represented by Formula 1. The compound in the present invention is represented by Formula 1. In Formula 1, R1 represents a group in which an R1—O bond is cleaved by heat or exposure to infrared rays.;

主权项

1. A color developing composition comprising a compound represented by Formula 1, wherein, in Formula 1, R1 represents a group in which an R1—O bond is cleaved by heat or exposure to infrared rays, R2 and R3 each independently represent a hydrogen atom or an alkyl group, R2 and R3 may be linked to each other to form a ring, Ar1 and Ar2 each independently represent a group forming a benzene ring or a naphthalene ring, Y1 and Y2 each independently represent an oxygen atom, a sulfur atom, —NR0—, or a dialkyl methylene group, R4 and R5 each independently represent an alkyl group, R6 to R9 each independently represent a hydrogen atom or an alkyl group, R0 represents a hydrogen atom, an alkyl group, or an aryl group, and Za represents a counter ion neutralizing a charge.