Disazo dyes and inks containing them

摘要

Compounds of Formula (1) and salts thereof:wherein:A is optionally substituted phenyl;R1 and R2 are each independently optionally substituted alkyl or optionally substituted alkoxy; andR4 and R5 are each independently H, optionally substituted alkyl or optionally substituted aryl;provided that (i) at least one of R1 and R2 carries an -OH group; and(ii) A is not of the formula: wherein m is 1, 2 or 3.The compounds are useful as dyes for ink jet printing inks.