Coloring phthalide compounds, method of producing the compounds and recording materials using any of the compounds as coloring component

摘要

Coloring phthalide compounds having general formula [I], a method of producing the phthalide compounds and a recording material comprising as a coloring component any of the coloring phthalide compounds are disclosed, [I] wherein R1 and R2 each represent a straight chain or branched alkyl group having 1 to 6 carbon atoms, a cycloalkyl group, or a benzyl group, and R1 and R2 in combination may form a ring; R3 represents an alkyl group having 1 to 4 carbon atoms; R4 represents a dialkylamino group having 1 to 6 carbon atoms, a cyclic amino group or halogen, l is an integer of 0 to 4; A represents wherein R5 and R6 each represent a straight chain or branched alkyl group having 1 to 8 carbon atoms, a cycloalkyl group, or a benzyl group, R5 and R6 in combination may form a ring; and B is the same as A, or represents a phenyl group which may have a substituent.