Zeneca Limited

Imperial Chemical Industries Limited

Other

Avecia Limited

James Stanley Campbell

Peter Gregory

Dean Thetford

David Boyd Baird

Brian R Fishwick

Peter J Smith

Robert D McClelland

David Melville Fawkes

Kane N Kramer

Brian Ribbons Fischwick

The invention provides an ink composition comprising a charge generating material and a medium wherein the charge generating material absorbs radiation in both the near infra-red and visible regions of the electromagnetic spectrum. Also provided is an electrophotographic toner composition comprising a binder resin and the charge generating material. The compositions are useful in, for example, security marking wherein the composition is printed on an article or substrate. Methods of establishing the authenticity of an article or substrate are also provided which comprise detecting an absorption of infra-red radiation by the charge generating material.

Phthalocyanine based inks with absorption maxima in the near infra-red and visible spectrum

Composition, compound and use

Toner resin composition employing a guanidine salt derivative

Colored cyan toner for electroreprography and laser printing based on Solvent Blue 70 and a trichomatic set of colored toners based on Solvent Blue 70, benzodifuranone red dyes and azo pyridone yellow dyes.

Trichromatic set of colored toners

A phthalocyanine of Formula (1): ##STR1## wherein: M.sub.k PC is a phthalocyanine nucleus of Formula (2): ##STR2## M is a metal atom, a chloro-metal group, and oxy-metal group or hydrogen; k is inverse of 1/2 valency of M; R and R.sup.1 each independently is an organic radical;

Phthalocyanines

A phthalocyanine of Formula (1): ##STR1## wherein: M.sub.k PC iS a phthalocyanine nucleus of Formula (2): ##STR2## M is a metal atom, a chloro-metal group, and oxy-metal group or hydrogen; k is inverse of 1/2 valency of M;

Portable data processing and storage system

Process for manufacture of the heterocyclic compounds of the formula: ##STR1## wherein X is cyano, acyl, alkylsulphonyl, arylsulphonyl, optionally substituted alkoxycarbonyl, nitro, phenyl or sulphamoyl, and

Process for the manufacture of heterocyclic compounds

The disperse monoazo dyestuffs, free from sulphonic acid groups, which are of the formula: ##STR1## wherein X is hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, --NR.sup.1 R.sup.2, --SR.sub.3, chlorine, bromine --OR.sup.3 or --SO.sub.2 R.sup.3 ;

Growing community of inventors

Manchester, United Kingdom

James Stanley Campbell