Disazo dyes and inks containing them

摘要

A compound of Formula (1) and salts thereofare useful as dyes for ink jet printing inks. In Formula (I) m is 1, 2 or 3; R<1 >and R<2 >are each independently optionally substituted alkoxy; and R<4 >and R<5 >are each independently H, optionally substituted alkyl or optionally substituted aryl; provided that at least one of R<1 >and R<2 >carries an -OH group.