# US 2021/0341858 A1 · Electrophotographic belt and electrophotographic image forming apparatus

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- Number: US 2021/0341858 A1
- Document ID: US20210341858A1
- Status: Published application
- Kind: A1
- Application number: 17/241,786
- Filed: 2021-04-27
- Published: 2021-11-04
- Earliest claimed: 2020-05-01
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Kaoru Okamoto; Atsushi Hori; Naoto Kameyama
- Web page: https://patentgrep.com/patent/US20210341858A1

## CPC

- G03G 15/162: {details of the the intermediate support, e.g. chemical composition}
- G03G 15/754: {relating to band, e.g. tensioning (G03G15/757 takes precedence)}
- B29C 66/4324: {for making closed loops, e.g. belts}
- G03G 5/14708: {comprising organic material}
- G03G 2215/00957: Compositions
- G03G 2215/1623: Transfer belt
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)

## Abstract

An electrophotographic belt including: a base layer, an elastic layer formed on the base layer, and a surface layer formed on the elastic layer. The surface layer contains a binder resin and polytetrafluoroethylene particles. A content of the polytetrafluoroethylene particles is 200 parts by mass or more with respect to 100 parts by mass of the binder resin. The polytetrafluoroethylene particles have a number average particle diameter of 200 nm or less.

## Claims

### Claim 1

An electrophotographic belt comprising:
a base layer;
an elastic layer on the base layer; and
a surface layer on the elastic layer,
wherein the surface layer contains a binder resin and polytetrafluoroethylene particles,
wherein a content of the polytetrafluoroethylene particles is 200 parts by mass or more with respect to 100 parts by mass of the binder resin, and
wherein the polytetrafluoroethylene particles have a number average particle diameter of 200 nm or less.

### Claim 2 (depends on 1)

The electrophotographic belt according to claim 1, wherein the polytetrafluoroethylene particles have a number average particle diameter of 50 nm or more.

### Claim 3 (depends on 1)

The electrophotographic belt according to claim 1, wherein the content of the polytetrafluoroethylene particles is 250 parts by mass or more with respect to 100 parts by mass of the binder resin.

### Claim 4 (depends on 1)

The electrophotographic belt according to claim 1, wherein the content of the polytetrafluoroethylene particles is 300 parts by mass or less with respect to 100 parts by mass of the binder resin.

### Claim 5 (depends on 1)

The electrophotographic belt according to claim 1, wherein the electrophotographic belt has an endless belt shape.

### Claim 6 (depends on 5)

The electrophotographic belt according to claim 5,
wherein the base layer has an endless belt shape,
the elastic layer is on an outer peripheral surface of the base layer, and
the surface layer is on an outer peripheral surface of the elastic layer.

### Claim 7 (depends on 1)

The electrophotographic belt according to claim 1, wherein the binder resin is one of a urethane resin and a urethane acrylate resin.

### Claim 8

An electrophotographic image forming apparatus comprising:
an image bearing member configured to bear a toner image; and
an intermediate transfer belt configured to carry and convey the toner image that is primarily transferred from the image bearing member in order to secondarily transfer the toner image onto a transfer material,
wherein the intermediate transfer belt includes an electrophotographic belt including a base layer, an elastic layer on the base layer, and a surface layer on the elastic layer,
wherein the surface layer contains a binder resin and polytetrafluoroethylene particles,
wherein a content of the polytetrafluoroethylene particles is 200 parts by mass or more with respect to 100 parts by mass of the binder resin, and
wherein the polytetrafluoroethylene particles have a number average particle diameter of 200 nm or less.

### Claim 9 (depends on 8)

The electrophotographic image forming apparatus according to claim 8,
wherein the base layer has an endless belt shape,
wherein the elastic layer is on an outer peripheral surface of the base layer, and
wherein the surface layer is on an outer peripheral surface of the elastic layer.

### Claim 10 (depends on 8)

The electrophotographic image forming apparatus according to claim 8, further comprising a cleaning blade that is arranged so that at least a part of the cleaning blade is brought into contact with an outer peripheral surface of the surface layer of the electrophotographic belt.