Novel black disazo dyes for use in ink jet printing give optically dense non-tinged fast and abrasion-resistant black ink-jet printing on coated or uncoated paper or plastics film

摘要

Two isomeric types of black disazo dyes each with a naphthol group substituted by SO3H and NH(CH2)2CN groups are claimed. Black disazo dyes of formulae (I) and (II) are claimed. [Image] [Image] A : optionally substituted phenyl or naphthyl group of formula (III); [Image] R1 - R3H, SO3M, COOM, N-substituted carboxamido, optionally substituted 1-18C alkyl, alkoxy or thioalkyl, halogen, OH or CN when A is a substituted phenyl group or (ii) H, SO3M or COOM when A is a substituted naphthyl group; B : optionally substituted phenylene or naphthylene group of formula (IV); [Image] R4 and R5(i) H, SO3M, COOM, optionally substituted 1-18C alkyl, alkoxy or thioalkyl or halogen when B is a substituted phenylene group, or (ii) H or SO3M when B is a substituted naphthylene group; and M : H, metal cation or ammonium cation optionally carrying one or more optionally substituted 1-18C alkyl group An independent claim is included for the preparation of the disazo dyes.