# US 5,702,824 A · Dielectrics for transfer sheet carrying member

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- Number: US 5,702,824 A
- Document ID: US5702824A
- Status: Granted
- Kind: A
- Application number: 08/440,310
- Filed: 1995-04-05
- Granted: 1997-12-30
- Earliest claimed: 1994-04-07
- Assignees: Kureha Kagaku Kogyo Kabushiki Kaisha
- Inventors: Satoru Matsunaga; Masayuki Hino; Yosikiti Teramoto
- Web page: https://patentgrep.com/patent/US5702824A

## CPC

- G03G 15/1655: {comprising a rotatable holding member to which the second base is attached or attracted, e.g. screen transfer holding drum}
- G03G 15/0131: {for transferring a pattern to a second base}
- Y10T 428/24802: Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T 428/31504: Composite [nonstructural laminate]
- Y10T 428/3154: Of fluorinated addition polymer from unsaturated monomers
- Y10T 428/31855: Of addition polymer from unsaturated monomers
- Y10T 428/31909: Next to second addition polymer from unsaturated monomers
- Y10T 428/31935: Ester, halide or nitrile of addition polymer
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The disclosure describes dielectrics for a transfer sheet carrying member used in electrophotographic image forming apparatus, comprising 80 to 96 mass % of a vinylidene fluoride-based resin and 4 to 20 mass % of a methyl methacrylate-based resin.

## Claims

### Claim 1

A transfer sheet carrying member of an electrophotographic image forming apparatus, comprising 80 to 96 mass % of a vinylidene fluoride based resin having an inherent viscosity of 0.8 to 1.4 dl/g as measured in a concentration of 0.4 g/dl at 30.degree. C. with dimethylformaldehyde as solvent and 4 to 20 mass % of a methyl methacrylate-based resin having a melt viscosity of 90 to 6,000 Pa's as measured at 250.degree. C. at a shear rate of 50 sec.sup.-1.

### Claim 2 (depends on 1)

A transfer sheet carrying member according to claim 1 wherein the content of the vinylidene fluoride-based resin is 85 to 95 mass % and the content of the methyl methacrylate-based resin is 5 to 15 mass %.

### Claim 3 (depends on 1)

A transfer sheet carrying member according to claim 1 wherein the vinylidene fluoride resin is a vinylidene fluoride homopolymer, a copolymer of not less than 70 mol % of vinylidene fluoride and at least one comonomer selected from the group consisting of ethylene tetrafluoride, ethylene trifluoride, ethylene trifluorochloride, vinyl fluoride and propylene hexafluoride, or a mixture of said polymers.

### Claim 4 (depends on 1)

A transfer sheet carrying member according to claim 1 wherein the transfer sheet carrying member has a thickness of 5 to 200 .mu.m.

### Claim 5 (depends on 1)

A transfer sheet carrying member according to method according to claim 1 wherein an elastic layer is disposed on the transfer sheet carrying member, the elastic layer having a density of 20 to 150 kg/m.sup.3 and a compressibility at the transfer position of 0 to 2 mm, with the linear pressure within this compressibility of not more than 1 kg/mm.

### Claim 6

An electrophotographic image forming apparatus comprising a transfer sheet carrying member that comprises a transfer sheet comprising 80 to 96 mass % of a vinylidene fluoride-based resin having an inherent viscosity of 0.8 to 1.4 dl/g as measured in a concentration of 0.4 g/dl at 30.degree. C. with dimethylformaldehyde as solvent and 4 to 20 mass % of a methyl methacrylate-based resin having a melt viscosity of 90 to 6,000 pa.s as measured at 250.degree. C. at a shear rate of 50 sec.sup.-1.

### Claim 7 (depends on 6)

An electrophotographic image forming apparatus according to claim 6 wherein the vinylidene fluoride-based resin in the transfer sheet carrying member is 85 to 95 mass % and the content of the methyl methacrylate-based resin is 5 to 15%.

### Claim 8 (depends on 6)

An electrophotographic image forming apparatus according to claim 6 wherein an elastic layer is disposed on the transfer sheet carrying member, the elastic layer having a density of 20 to 150 kg/m.sup.3 and a compressibility at the transfer position of 0 to 2 mm, with the linear pressure within this compressibility of not more than 1 kg/mm.