Imperial Chemical Industries Limited

Zeneca Limited

John E Presgrave

Peter Gregory

David Greenwood

Ronald W Kenyon

Aidan Joseph Lavery

Disclosed are compositions useful in inks suitable for ink jet printing. The compositions comprising a black dye of specified formula and a dye of the formula (A) or salt thereof:

Dye compositions

Dye compositions and aqueous inks derived therefrom, especially suitable for use in ink jet printing in which the dye composition contains (a) one or more dyes which, in the free acid form, are of Formula (1): ##STR1## wherein W is H or COOH;

Dye composition and aqueous ink derived therefrom

Black compounds of Formula (1) having enhanced solubility in polar organic liquids which are useful as ink colorants in conventional and hot melt ink-jet printing and automatic identification, as black colorants for toners and thermal wax transfer sheets and as charge control agents for electrophotographic toners; ##STR1## wherein R is H, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, aryl, C.sub.4-8 cycloalkyl, --CN, --NO.sub.2, halogen, --COOR.sup.1, --OH, --SH or --SO.sub.3 A;

Salts of black trisazo dyes with alkyl amines having good solubility in

An ink for ink-jet printing comprising a solution of C.I. Direct Black 168.

Growing community of inventors

Todmorden, United Kingdom

John E Presgrave