# US 10,768,557 B2 · Intermediary transfer belt and image forming apparatus

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- Number: US 10,768,557 B2
- Document ID: US10768557B2
- Status: Granted
- Kind: B2
- Application number: 16/717,480
- Filed: 2019-12-17
- Published: 2020-06-25
- Granted: 2020-09-08
- Earliest claimed: 2018-12-20
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Kaoru Okamoto; Kazuhisa Shirayama; Ryosuke Tsuruga; Yasutomo Tsuji
- Web page: https://patentgrep.com/patent/US10768557B2

## CPC

- G03G 15/162: {details of the the intermediate support, e.g. chemical composition}
- G03G 15/0131: {for transferring a pattern to a second base}
- G03G 15/161: {with means for handling the intermediate support, e.g. heating, cleaning, coating with a transfer agent}
- G03G 15/1685: {Structure, details of the transfer member, e.g. chemical composition}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An intermediary transfer belt includes a base layer; an elastic layer laminated on or above the base layer and formed with a silicone rubber as an elastic member; an intermediary layer laminated on or above the elastic layer; and a surface layer laminated on or above the intermediary layer. The elastic layer is 60 degrees or less in JIS-A hardness and is 5 degrees or more in JIS-E hardness. The intermediary layer is 0.1 g/m2·24 h or more and 600 g/m2·24 h or less in water vapor permeability coefficient and is 1 μm or more and 15 μm or less in average thickness.

## Claims

### Claim 1

An intermediary transfer belt comprising:
a base layer;
an elastic layer provided on or above said base layer and formed with a silicone rubber as an elastic member;
an intermediary layer provided on or above said elastic layer; and
a surface layer provided on or above said intermediary layer,
wherein said elastic layer is 60 degrees or less in JIS-A hardness and is 5 degrees or more in JIS-E hardness, and
wherein said intermediary layer is 0.1 g/m2·24 h or more and 600 g/m2·24 h or less in water vapor permeability coefficient and is 1 μm or more and 15 μm or less in average thickness.

### Claim 2 (depends on 1)

An intermediary transfer belt according to claim 1, wherein said intermediary layer is 100 g/m2·24 h or less in water vapor permeability coefficient.

### Claim 3 (depends on 1)

An intermediary transfer belt according to claim 1, wherein said intermediary layer is formed of urethane resin material, polyamide resin material, polyvinylidene chloride resin material, fluorine-containing resin material or cellulose acetate resin material.

### Claim 4 (depends on 1)

An intermediary transfer belt according to claim 1, further comprising a SiO2 layer provided between said elastic layer and said intermediary layer.

### Claim 5 (depends on 4)

An intermediary transfer belt according to claim 4, wherein said SiO2 layer is 0.1 μm or more and 2.0 μm or less in average thickness.

### Claim 6 (depends on 1)

An intermediary transfer belt according to claim 1, further comprising a surface modifying layer formed by subjecting said elastic layer to excimer ultraviolet irradiation.

### Claim 7 (depends on 6)

An intermediary transfer belt according to claim 6, wherein said surface modifying layer is 0.1 μm or more and 2.0 μm or less in average thickness.

### Claim 8 (depends on 1)

An intermediary transfer belt according to claim 1, wherein said elastic layer is 130% or more and 160% or less in degree of swelling as measured by a toluene swelling method.

### Claim 9 (depends on 1)

An intermediary transfer belt according to claim 1, wherein said elastic layer contains an ion conductive agent.

### Claim 10 (depends on 1)

An intermediary transfer belt according to claim 1, which is 100 μm or more and 1000 μm or less in thickness.

### Claim 11 (depends on 1)

An intermediary transfer belt according to claim 1, which is 1.0×108 Ω·cm or more and 1.0×1013 Ω·cm in volume resistivity.

### Claim 12 (depends on 1)

An intermediary transfer belt according to claim 1, which is 1.0×109 Ω/square or more and 1.0×1013 Ω/square or less in surface resistivity as measured from said surface layer side.

### Claim 13 (depends on 1)

An image forming apparatus comprising:
an image forming portion; and
an intermediary transfer belt according to claim 1.