Zeneca Limited

Avecia Limited

Fujifilm Imaging Colorants, Inc.

Colin Dick Robertson

Prakash Patel

Paul Wight

Mark Kenworthy

Aidan Joseph Lavery

Kathryn Carr

Janette Watkinson

Jill Louise Johnson

A process for preparing a mixture of copper phthalocyanine dyes of Formula (1): CuPc(SOM)(SONH), wherein: CuPc is copper phthalocyanine; M is a cation; x and y each independently have a value of from 0.5 to 3.5; and (x+y)=2 to 5; which process includes: chlorosulphonating a copper phthalocyanine compound using a chlorosulphonating agent; and condensing the product of step (i) with ammonia to give a mixture of copper phthalocyanine dyes of Formula (1); optionally exchanging the cation M in the mixture of copper phthalocyanine dyes of Formula (1) resulting from step (ii) for an alternative cation M; wherein the chlorosulphonating agent includes a mixture of chlorosulphonic acid and a chlorinating agent selected from phosphorous oxychloride and phosphorous trichloride. Also the dyes obtainable from this process; compositions and inks including these dyes; materials printed with these dyes, compositions or inks; ink-jet printer cartridges containing inks made from the dyes; and ink-jet printers including these cartridges.

Process for preparing phthalocyanine compounds

Disazodyes for ink jet printing

Phthalocyanine compounds of Formula (1) have utility as colorants in inks for ink-jet printing, where Formula (1) represents: ##STR1## in which: M represents a metal or H;

Phthalocyanine dyes, inks containing the same and use thereof in ink jet

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Grangemouth, United Kingdom

Colin Dick Robertson