Nova Patents
EP0755984A1

Dyes for ink jet printing

Abstract

There is described novel azo dyes of formula (4) with high water solubility for use in aqueous inks, particularly for ink jet recording, which provide images having high water, smudge and light resistance wherein n, mare each independently 2 to 6;Ris hydrogen or an aliphatic radical having from 1 to 6 atoms;Mis hydrogen, a metal atom, preferentially an alkali metal, an ammonium or ammonium substituted with alkyl, alkoxyalkyl or hydroxyalkyl each having 1 to 12 C atoms and Frepresents a mono-azo or a poly-azo dye residue.

EP0755984A1, drawing sheet 1
Sheet 1 of 51

Term

Term ended

Projected expiry passed 17 July 2016, 10.2 years ago.

  1. Priority
  2. Filed
  3. Published
  4. Projected expiry
  5. Today

16 claims: 3 independent, 13 dependent

  1. 1
    An azo dye of formula (4) where n, m   are each independently 2 to 6;R   is hydrogen or an aliphatic radical having from 1 to 6 C atoms;M   is hydrogen or a metal atom, an ammonium or ammonium substituted with alkyl, alkoxyalkyl and hydroxyalkyl each having 1 to 12 C atoms;and F   represents a mono-azo or a poly-azo dye residue.
  2. 15
    An ink for ink jet printing comprising a dye or a mixture of dyes as described in anyone of claims 1 to 14.
  3. 16
    An ink for ink jet printing which contains in addition to a dye or dyes as claimed in anyone of claims 1 to 14 one or more other dyes.
Independent claims3