Patent · US Expired

Specifically influencing the triboelectric effect of azo pigments

US4957841A · kind A · utility

9Cited by

6References

7Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Hans-Tobias Macholdt · Darmstadt, DE
Alexander Sieber · Frankfurt am Main, DE
Franz Schui · Frankfurt am Main, DE
Reinhold Deubel · Bad Soden am Taunus, DE

Key dates

Filing date	Sep 14, 1989
Grant date	Sep 18, 1990
Priority date	—
Expiry date	Sep 14, 2009

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S524/904
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Process for specifically influencing the triboelectric effect of azo pigments in electrophotographic toners or developers or in powders for surface coating by adding to the azo pigments at the coupling reaction stage, at the laking stage or in the course of finishing at least one saltlike, cationic compound whose positively charged center is a nitrogen, phosphorus, arsenic or antimony atom or the group ##STR1## and use of such azo pigments for producing toners or developers used for the electrophotographic copying or manifolding of originals or for printing electronically, optically or magnetically stored data or in colorproofing or use of such azo pigments for producing powders or powder coatings used for the surface coating of articles made of metal, wood, plastics, glass, ceramics, concrete, textile material, paper or rubber.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.