The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 18, 1994
Filed:
Nov. 10, 1992
Seiji Horie, Kanagawa, JP;
Kenji Sano, Kanagawa, JP;
Nobuo Suzuki, Kanagawa, JP;
Shu Watarai, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A positively chargeable liquid developer for electrostaticphotography comprising a non-aqueous solvent having a volume specific resistance of at least 10.sup.9 .OMEGA.cm and resin grains dispersed therein, wherein the resin grains contain a dispersion stabilizing resin which is dissolved or dispersed in a colloidal form in the non-aqueous solvent and which mainly comprises a graft copolymer composed of (1) at least one macromonomer (M) having a weight average molecular weight of from 1.times.10.sup.3 to 1.times.10.sup.5 obtained by bonding a terminal carboxyl group bonded to the main chain of a polymer containing at least one specific polymer component to an epoxy compound having at least one polymerizable double bond group, using a quaternary ammonium salt as a reaction catalyst, and (2) at least one specific monomer, which gives the definite chargeability, easily controls the charge amount, is excellent in dispersion stability and endures long-term use and storage.