# US 7,608,325 B2 · Fuser member having conductive fluorocarbon outer layer

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- Number: US 7,608,325 B2
- Document ID: US7608325B2
- Status: Granted
- Kind: B2
- Application number: 11/523,970
- Filed: 2006-09-20
- Published: 2008-03-20
- Granted: 2009-10-27
- Earliest claimed: 2006-09-20
- Assignees: Xerox Corporation
- Inventors: Kenneth R. Rasch; Santokh S. Badesha
- Web page: https://patentgrep.com/patent/US7608325B2

## CPC

- G03G 15/2057: {relating to the chemical composition of the heat element and layers thereof}
- Y10T 428/25: Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T 428/31544: Addition polymer is perhalogenated
- Y10T 428/31663: As siloxane, silicone or silane
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A fuser member comprising a substrate, and thereover, an outer layer comprising perfluoroalkoxy polytetrafluoroethylene and carbon black fillers, wherein said outer layer has a volume resistivity of from about 1×10−4 to about 1×10−8 ohms/square.

## Claims

### Claim 1

A fuser member comprising a substrate, and thereover, an outer layer comprising perfluoroalkoxy polytetrafluoroethylene and a first carbon black filler having a bulk resistivity of from about 100 to about 10−4 ohms-cm, wherein said outer layer has a resistivity, tailored according to a size and particle geometry of carbon black therein, to be from about 1×10−4 to about 1×10−8 ohms/square, wherein said perfluoroalkoxy polytetrafluoroethylene is present in the outer layer in an amount of from about 75 to about 95 percent by weight of total solids, and further wherein said first carbon black filler is present in said outer layer in an amount of from about 5 to about 8 percent by weight of total solids.

### Claim 2 (depends on 1)

The fuser member of claim 1, wherein said resistivity is from about 1×10−5 to about 1×10−7 ohms/square.

### Claim 3 (depends on 1)

The fuser member of claim 1, wherein said first carbon black has a particle size of from about 5 to about 10 nanometers.

### Claim 4 (depends on 1)

The fuser member of claim 1, wherein said carbon black has a particle geometry selected from the group consisting of sphere, crystalline, flake, platelet, fiber, whisker, or rectangular.

### Claim 5 (depends on 3)

The fuser member of claim 3, wherein said carbon black has a crystalline or needle-like shape.

### Claim 6 (depends on 1)

The fuser member of claim 1, further comprising an intermediate layer positioned over the substrate.

### Claim 7 (depends on 6)

The fuser member of claim 6, wherein said intermediate layer comprises a silicone rubber.

### Claim 8 (depends on 1)

The fuser member of claim 1, further comprising a second filler, in addition to said first carbon black filler.

### Claim 9 (depends on 8)

The fuser member of claim 8, said second filler is selected from the group consisting of carbon fillers other than said first carbon filler, metal fillers, ceramic fillers, metal oxide fillers, doped metal oxide fillers, polymers fillers, and mixtures thereof.

### Claim 10 (depends on 9)

The fuser member of claim 9, wherein said second filler is an electrically conductive metal oxide.

### Claim 11 (depends on 9)

The fuser member in accordance with claim 9, wherein said second filler is a metal selected from the group consisting of aluminum and steel.

### Claim 12 (depends on 1)

The fuser member of claim 1, further comprising an outer release layer provided on said fluorocarbon outer layer.

### Claim 13 (depends on 1)

The fuser member of claim 1, wherein said fluorocarbon outer layer has an aspect ratio of from about 1 to about 1,000.

### Claim 14 (depends on 1)

The fuser member of claim 1, wherein a continuous conductive discharge path is created between said fluorocarbon outer layer and a continuous ground path.

### Claim 15

A fuser member comprising a substrate, and thereover, an intermediate layer comprising silicone rubber, and an outer layer positioned on said intermediate layer, wherein said outer layer comprises perfluoroalkoxy polytetrafluoroethylene and carbon black filler, wherein said outer layer has a resistivity, tailored according to a size and particle geometry of the carbon black therein, to be from about 1×10−4 to about 1×10−8 ohms/square.

### Claim 16

An image forming apparatus for forming images on a recording medium comprising a charge-retentive surface to receive an electrostatic latent image thereon; a development component to apply toner to the charge-retentive surface to develop an electrostatic latent image to form a developed image on the charge retentive surface; a transfer film component to transfer the developed image from the charge retentive surface to a copy substrate; and a fuser member and fuser member for fusing toner images to a surface of the copy substrate, wherein said fuser member comprises a substrate, and thereover, an outer layer comprising perfluoroalkoxy polytetrafluoroethylene and carbon black filler wherein said outer layer has a resistivity, tailored according to a size and particle geometry of the carbon black filler therein, to be from about 1×10−4 to about 1×10−8 ohms/square, and wherein said carbon black filler is present in said outer layer in an amount of from about 5 to about 8 percent by weight of total solids.