# US 5,708,943 A · Compliant doctor blade surface having molybdenum disulfide

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- Number: US 5,708,943 A
- Document ID: US5708943A
- Status: Granted
- Kind: A
- Application number: 08/724,881
- Filed: 1996-10-03
- Granted: 1998-01-13
- Earliest claimed: 1996-10-03
- Assignees: Lexmark International, Inc.
- Inventors: Steven L. Applegate; Peter W. Bracken; Jeffery R. Brener; Martin V. DiGirolamo; Samuel E. Mullinix, Jr.; Donald W. Stafford; Peter E. Wallin
- Web page: https://patentgrep.com/patent/US5708943A

## CPC

- G03G 15/0812: {characterised by the developer regulating means, e.g. structure of doctor blade}
- G03G 2215/0866: Metering member
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

The conductive film (3) of a compliant doctor blade has dispersed particles of molybdenum disulfide, as well as dispersed particles of grit and conductive filler. The molybdenum disulfide eliminates filming of toner. The molybdenum disulfide may be a surface powder since the anti-film action occurs at the pre-nip and therefore is not lost by the molybdenum disulfide wearing away at the nip.

## Claims

### Claim 1

A compliant blade for metering charged electrophotographic toner held on a developer roller by physically contacting a sector of said roller with an electrically conductive surface of said blade, said electrically conductive surface at least in the region prior to said contacting comprising molybdenum disulfide in plate form particles to reduce filming.

### Claim 2 (depends on 1)

The compliant doctor blade as in claim 1 in which said molybdenum disulfide is a powder applied to the outside at said blade.

### Claim 3 (depends on 1)

The compliant doctor blade as in claim 1 in which said molybdenum disulfide is incorporated into a binder resin which forms said electrically conductive surface.

### Claim 4 (depends on 3)

The compliant doctor blade as in claim 3 in which said molybdenum disulfide has an average particle size of about 10 microns.

### Claim 5 (depends on 1)

The compliant doctor blade as in claim 1 in which said molybdenum disulfide has an average particle size of about 10 microns.

### Claim 6 (depends on 2)

The compliant doctor blade as in claim 2 in which said molybdenum disulfide has an average size of about 10 microns.

### Claim 7 (depends on 3)

The compliant doctor blade as in claim 3 in which said binder also has incorporated in it ceramic oxide grit particles of about 20 micron particle size.

### Claim 8 (depends on 7)

The compliant doctor blade as in claim 7 in which said molybdenum disulfide has an average particle size of about 10 microns.

### Claim 9 (depends on 8)

The compliant doctor blade as in claim 8 also comprising about 5 percent by weight conductive carbon black, about 30 percent by weight said molybdenum disulfide and about 50 percent by weight said grit.

### Claim 10 (depends on 9)

The compliant doctor blade as in claim 9 in which said grit is silicon carbide.