Patent · US Expired

Polymeric ammonium compounds as charge control agents

US5187038A · kind A · utility

11Cited by

10References

18Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Jorg Gitzel · Hattersheim, DE
Detlef Wehle · Burgkirchen an der Alz, DE
Hans-Tobias Macholdt · Darmstadt, DE

Key dates

Filing date	Sep 17, 1991
Grant date	Feb 16, 1993
Priority date	—
Expiry date	Sep 17, 2011

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S525/934
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Use of polymeric ammonium salts which have a molecular weight of about 5000 to about 500,000, and are obtained by homopolymerization of monomers, such as, for example, diallyldialkylammonium chloride, or by copolymerization of mixtures of two monomers, such as, for example, diethyldimethylammonium chloride and diallylmethyloctylammonium chloride, with molar monomer ratios of about 0.5:0.5 to about 0.95:0.05 in the copolymer, and if appropriate subsequent anion exchange, individually or in combination as charge control agents in electrophotographic toners and developers which are employed for copying or duplicating masters and for printing electronically, magnetically or optically stored information or in colorproofing, and as charge control agents in powders and powder coatings.

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