Zeneca Limited

Imperial Chemical Industries Limited

Anthony A Watson

Raymond S Gairns

Kathryn Carr

Azo dyes of Formula (1) have utility as dyes for ink-jet printing where Formula (1) represents:

Dye compounds, compositions containing them and their use

A compound suitable for use as a charge transport compound in organic photoconductors or as a charge control agent in electrophotographic toners. The compound, in the neutral form, is of the Formula (1): ##STR1## wherein: Ar is of formula (a), (b) or (c) ##STR2## each L independently is H, C.sub.1-4 -alkyl or halo; R.sup.1, R.sup.3 and R.sup.4 are each independently alkyl, substituted alkyl, aryl, substituted aryl, aralkyl, substituted aralkyl, cycloalkyl or allyl;

Chemical compounds

A compound of Formula (1): ##STR1## wherein: Ar is ##STR2## R.sup.1 is alkyl, substituted alkyl, aryl or substituted aryl, aralkyl or substituted aralkyl;

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Cheetham, United Kingdom

Anthony A Watson