Pigment for electrophotographic toners and developers
AssigneeClariant GmbH
InventorsHans Joachim Metz, R{umlaut over (u)}diger Baur, Hans-Tobias Macholdt
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Abstract
Azo pigment of the formula (1) which has a specific surface area of the pigment powder of more than 45 m2/g. The azo pigment is particularly suitable as colorant in electrophotographic toners and devlopers, and in powder coatings and electret materials.
Claims19
A powder consisting essentially of an acrylic resin or polyester resin which contains epoxide, carboxyl or hydroxyl groups, or a combination of these resins, from 0.5 to 5% by weight of the azo pigment of the formula (1)
- which has a specific surface area of the pigment powder of 60 to 78 m2/g and from 1 to 5% by weight of a charge control agent selected from the group consisting of the triphenylmethanes;
- ammonium compounds;
- iminium compounds;
- fluorinated ammonium compounds and iminium compounds;
- biscationic acid amides;
- polymeric ammonium compounds;
- diallylammonium compounds;
- aryl sulfide derivatives;
- phenol derivatives;
- phosphonium compounds and fluorinated phosphonium compounds;
- calixarenes;
- cyclically linked oligosaccharides;
- polyester salts;
- metal complex compounds;
- benzimidazolones;
- azines, thiazines and oxazines.
An electrophotographic toner consisting essentially of a toner binder, from 0.1 to 50% by weight of an azo pigment of the formula (1)
- which has a specific surface area of 60 to 78 m2/g and from 0.01 to 20% by weight of a charge control agent selected from the group consisting of the triphenylmethanes;
- ammonium compounds;
- immonium compounds;
- fluorinated ammonium compounds;
- fluorinated immonium compounds;
- biscationic acid amides;
- polymeric ammonium compounds;
- diallylammonium compounds;
- aryl sulfide derivatives;
- phenol derivatives, phosphonium compounds, fluorinated phosphonium compounds;
- calixarenes, cyclically linked oligosaccharides;
- polyester salts;
- metal complex compounds;
- benzimidazolones;
- azines, thiazines and oxazines.
A powder consisting essentially of an acrylic resin or polyester resin which contains epoxide, carboxyl or hydroxyl groups, or a combination of these resins, from 0.1 to 50% by weight of an azo pigment of the formula (1)
- which has a specific surface area of 60 to 78 m2/g and from 0.01 to 20% by weight of a charge control agent selected from the group consisting of the triphenylmethanes;
- ammonium compounds;
- immonium compounds;
- fluorinated ammonium compounds;
- fluorinated immonium compounds;
- biscationic acid amides;
- polymeric ammonium compounds;
- diallylammonium compounds;
- aryl sulfide derivatives;
- phenol derivatives, phosphonium compound;
- fluorinated phosphonium compounds;
- calixarenes, cyclically linked oligosaccharides;
- polyester salts;
- metal complex compounds;
- benzimidazo lones;
- azines;
- thiazines and oxazines.
A powder consisting of a binder and from 0.1 to 50% by weight of an azo pigment of the formula (I)
- which has a specific surface area of 60 to 78 m2/g.
Dependencies are inferred from the claim text.