Patent · US Expired

Carrier composition for electrophotography

US5336580A · kind A · utility

6Cited by

5References

10Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Serge Tavernier · Lint, BE
Werner Jozef Johan Op de Beeck · Keerbergen, BE
Danny Van Wunsel · Nijlen, BE
Paul Marksch · Ekeren, BE

Key dates

Filing date	Feb 8, 1993
Grant date	Aug 9, 1994
Priority date	—
Expiry date	Feb 8, 2013

Classification

Technology area (CPC G)Physics
CPC primaryG03G9/10884
WIPO fieldOptics
WIPO sectorInstruments

Abstract

According to the present invention magnetic carrier particles are provided for use in magnetic brush toner-carrier development of electrostatic charge patterns, said particles incorporating finely divided magnetic pigment particles dispersed in a resin binder, characterized in that said carrier particles comprise a mixture of magnetic pigment particles wherein a portion (A) of said pigment particles has a coercive force of more than 300 Oe and another portion (B) of said pigment particles has a coercive force of less than 300 Oe, the weight ratio of said portions (A) and (B) being in the range of 0.1 to 10.

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