Electrophotographic, resin-containing, electret, or inkjet compo

Details Electrophotographic, resin-containing, electret, or inkjet compo Electrophotographic, resin-containing, electret, or inkjet compo

1998-09-18

2000-12-12

Rodee, Christopher D.

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Process of making developer composition

430106, 106 318, 524159, 524194, 524270, G03G 909, C09D 1100, C08J 542

Patent

active

061596493

ABSTRACT:
The use of an azo pigment of the formula (1) ##STR1## as a colorant in electrophotographic toners, electrophotographic developers, powders and powder coatings, and electret materials, wherein said azo pigment is prepared in the presence of 20 to 50% by weight of an auxiliary selected from the group consisting of a rosin, a salt of a rosin, an abietic acid, and a salt of an abietic acid, wherein said weight is based on the overall weight of the azo pigment including said auxiliary, and wherein the azo pigment has a specific surface area of more than 70 m.sup.2 /g and the azo pigment particles comprising the azo pigment have a length-to-width ratio of on average less than 2.8:1 and a mean particle size d.sub.50 of less than 130 nm.

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