US 6,818,370 B2 · Toner for developing electrostatic latent image, toner cartridge containing the toner and image forming apparatus

Abstract

A toner for developing an electrostatic latent image, containing a colorant and a binder resin composed of two different resins (A) and (B), wherein resin (A) is substantially free of tetrahydrofuran insolubles, is selected from polyester resins and polyol resins and has such a molecular weight distribution according to gel permeation chromatography that (a) a main peak is present in a molecular weight of 3000 to 9,000 and (b) that portion of resin (A) having a molecular weight of 500 or less accounts for 4% or less based on a total weight of resin (A), wherein resin (B) is substantially free of tetrahydrofuran insolubles and is a polyester resin containing a diol component represented by the formula (1): and wherein the weight ratio of resin (A) to resin (B) is in the range of 60:40 to 85:15.

Claims12

Dependent claims

A toner for developing an electrostatic latent image, comprising a hinder resin and a colorant, wherein said binder resin comprises different two resins (A) and (B),

said resin (A) being substantially free of tetrahydrofuran insolubles, being selected from the group consisting of polyester resins and polyol resins and having such a molecular weight distribution according to gel permeation chromatography that (a) a main peak is present in a molecular weight of 3000 to 9,000 and (b) that portion of said resin (A) having a molecular weight of 500 or less accounts for 4 % or less based on a total weight of said resin (A),
said resin (B) being substantially free of tetrahydrofuran insolubles and being a polyester resin containing a dial component represented by the formula (1):
wherein the weight ratio of said resin (A) to said resin (B) is in the range of 60:40 to 85:15.

Dependencies are inferred from the claim text.

Facts

Application

10/305,191Filed 27 Nov 2002

Priority

JP 2001-36726130 Nov 2001

Published

US 2003/0162115 A128 Aug 2003

Granted

16 Nov 2004

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

G03G 9/08795
Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775: characterised by their chemical…
G03G 9/08755
Comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds: polyesters
G03G 9/08759
Comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds: polyethers
G03G 9/08762
Comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds: other polymers having…

Toner for developing electrostatic latent image, toner cartridge containing the toner and image forming apparatus

Life of this patent

Toner for developing electrostatic latent image, toner cartridge containing the toner and image forming apparatus

Life of this patent

Abstract

Claims12