Patent · US Expired

Toner mixture and process for preparing the same

US6828072B1 · kind B1 · utility

1Cited by

7References

16Claims

0Family size

Assignee

Oce Printing Systems GmbH · DE

Inventors

Masahito Yamazaki · Wakayama, JP
Jiro Takemoto · Wakayama, JP
Hiromi Ueno · Tokyo, JP
Koji Akiyama · Neyagawa, JP
Jean-Philip Hulin · Poing, DE
Josef Knott · Poing, DE
Manfred Münz · Poing, DE
Andreas Paul · Kirkel, DE

Key dates

Filing date	Dec 13, 2002
Grant date	Dec 7, 2004
Priority date	—
Expiry date	Dec 13, 2022

Classification

Technology area (CPC G)Physics
CPC primaryG03G9/09
WIPO fieldOptics
WIPO sectorInstruments

Abstract

The present invention describes a process for preparing a toner mixture comprising mixing a first toner with at least one further toner wherein the first toner has an acid value of from 0.1 to 30 mgKOH/g and comprises at least one binder resin and at least one coloring agent wherein said binder comprises as the main component a polyester resin and wherein the further toners comprise at least a binder resin and optionally at least one coloring agent. It also describes a developer composition comprising said toner mixture and optionally a carrier. The new toner mixture does not show any de-mixing phenomenon during repeated use.

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