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US 5,853,929 AGranted
Trichromatic set of colored toners
AssigneeZeneca Limited
InventorJames Stanley Campbell
Life of this patent
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Abstract
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.
Claims11
A trichromatic set of coloured toners comprising a blue toner containing a metal phthalocyanine, a red toner containing a benzodifuranone dyestuff and a yellow toner containing an azopyridone dyestuff wherein the phthalocyanine is of formula I
- M Pc------(--SO.sub.2 NHR).sub.y
- wherein
- M is copper or nickel;
- Pc is a phthalocyanine radical;
- R is C.sub.4-20 -alkyl;
- and
- y is 3 or 4.
4 more elements
A set as claimed in claim 4 wherein the yellow toner contains an azopyridone dyestuff of formula III ##STR4## wherein X is halogen, nitro or a group --COOR.sup.5 ;
- R.sup.9 is C.sub.1-4 -alkyl;
- R.sup.10 is C.sub.1-12 -alkyl;
- R.sup.5 is as defined in claim 5;
- and
- n is 0to 3.
2 more elements
Dependencies are inferred from the claim text.