Patent · US Expired

Dry toners containing methinefanal pigments

US4849306A · kind A · utility

1Cited by

3References

9Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Roderich Raue · Dover, US
Hubertus Psaar · Leverkusen, DE
Horst Berneth · Leverkusen, DE

Key dates

Filing date	Feb 22, 1988
Grant date	Jul 18, 1989
Priority date	—
Expiry date	Feb 22, 2008

Classification

Technology area (CPC G)Physics
CPC primaryG03G9/0922
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Dry toners for developing latent electrostatic images in electrostatic recording and printing methods contain, as charge-control substance, a pigment of the formula EQU F.sup.+ A.sup.- (I) in which PA0 F represent a cationic radical of a methine dyestuff and PA0 A.sup.- represents an anion of a heteropolyacid based on tungsten and/or molybdenum with phosphorus, silicon, vanadium, cobalt, aluminum, manganese, chromium and/or nickel or a copper(I) hexacyanoferrate anion.

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