# US 7,745,089 B2 · Process for producing toner, and toner

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- Number: US 7,745,089 B2
- Document ID: US7745089B2
- Status: Granted
- Kind: B2
- Application number: 11/858,339
- Filed: 2007-09-20
- Published: 2008-01-17
- Granted: 2010-06-29
- Earliest claimed: 2004-02-20
- Assignees: Canon Kabushiki Kaisha
- Inventors: Nobuyuki Okubo; Tsutomu Onuma; Shuhei Moribe; Shinichiro Abe; Koji Nishikawa
- Web page: https://patentgrep.com/patent/US7745089B2

## CPC

- G03G 9/091: {Azo dyes}
- G03G 9/08708: {Copolymers of styrene}
- G03G 9/08711: {with esters of acrylic or methacrylic acid}
- G03G 9/08722: {Polyvinylalcohols; Polyallylalcohols; Polyvinylethers; Polyvinylaldehydes; Polyvinylketones; Polyvinylketals}
- G03G 9/08724: {Polyvinylesters}
- G03G 9/08726: {Polymers of unsaturated acids or derivatives thereof}
- G03G 9/08728: {Polymers of esters}
- G03G 9/08731: {Polymers of nitriles}
- G03G 9/08733: {Polymers of unsaturated polycarboxylic acids}
- G03G 9/08782: {Waxes}
- G03G 9/08793: {Crosslinked polymers}
- G03G 9/08795: {characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants}
- G03G 9/08797: {characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A process for producing a toner by subjecting a polymer and a resin component containing a cross-linkable polymer capable of cross-linkingly reacting with the polymer, to cross-linking reaction in the presence of a first wax to form a wax-containing cross-linked polymer composition; mixing the wax-containing cross-linked polymer composition with at least a colorant and a second wax, followed by melt-kneading to form a toner composition; and pulverizing the toner composition to produce toner particles. Also disclosed is a toner produced by this process. The toner thus obtained is a toner whose fixing performance and anti-offset properties are well balanced and also which makes it possible to afford images having less fog and high quality, over a long period of time in environments of from low temperature and low humidity to high temperature and high humidity, and is highly durable without causing any contamination of members with which the toner comes into contact.

## Claims

### Claim 1

A process for producing a toner, which comprises:
subjecting a polymer and a resin component containing a cross-linkable polymer capable of cross-linkingly reacting with the polymer, to cross-linking reaction in the presence of a first wax to form a wax-containing cross-linked polymer composition;
mixing the wax-containing cross-linked polymer composition with at least a colorant and a second wax, followed by melt-kneading to form a toner composition; and
pulverizing the toner composition to produce toner particles, wherein at least one of said first wax and said second wax has a polar group.

### Claim 2 (depends on 1)

The process for producing a toner according to claim 1, wherein said wax-containing cross-linked polymer composition contains a vinyl resin which contains in the molecule a partial structure represented by the following formula (A):

### Claim 3 (depends on 1)

The process for producing a toner according to claim 1, wherein a partial structure represented by the following formula (A) is formed during the cross-linking reaction of said polymer with said cross-linkable polymer:

### Claim 4 (depends on 1)

The process for producing a toner according to claim 1, wherein said polymer is a vinyl resin having a carboxyl group, said cross-linkable polymer is a vinyl resin having an epoxy group, and the cross-linking reaction takes place between the carboxyl group and the epoxy group.

### Claim 5 (depends on 1)

The process for producing a toner according to claim 1, wherein the first wax is a hydrocarbon wax and the second wax has a polar group.