Charge-controlled polyurethane foam and toner-conveying roller using the same

Patent metadata

Field	Value
Publication number	US-9316958-B2
Application number	US-200913003238-A
Country	US
Kind code	B2
Filing date	Jul 9, 2009
Priority date	Jul 10, 2008
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

Provided are charge-controlled polyurethane foam by which the influence of electrification by friction between toner on the surface layer of a toner-conveying roller and a developing roller can be sufficiently prevented and by which a good image can be stably obtained with a low cost, and a toner-conveying roller using the same.
The charge-controlled polyurethane foam is the one wherein the surface layer of the polyurethane foam is impregnated with a charge control agent which is on the negative side or on the positive side in the triboelectric series with respect to substrate polyurethane foam. The toner-conveying roller is the one which supports the charge-controlled polyurethane foam on the periphery of the axis of the roller.

First claim

The invention claimed is:

1. A toner-conveying roller which comprises a charge-controlled polyurethane foam, wherein a surface layer of the polyurethane foam is impregnated with a binder and a charge control agent which is on the negative side or on the positive side in the triboelectric series with respect to the charge-controlled polyurethane foam,
wherein the charge-controlled polyurethane foam is on an outer surface of an axis member of the roller,
wherein the density of the charge-controlled polyurethane foam is 10 to 50 kg/m 3 , and
wherein a number of cells in the charge-controlled polyurethane foam is from 20 to 80 cells/inch.

2. The toner-conveying roller according to claim 1 , wherein said charge control agent is on the negative side in the triboelectric series with respect to said polyurethane foam, and wherein the roller is for a positively charged toner.

3. The toner-conveying roller according to claim 1 , wherein said charge control agent is on the positive side in the triboelectric series with respect to said polyurethane foam, and wherein the roller is for a negatively charged toner.

4. The toner-conveying roller according to claim 1 , wherein the charge-controlled polyurethane foam is directly on the outer surface of the axis member.

5. The toner-conveying roller according to claim 1 , wherein the charge-controlled polyurethane foam is adhered to the outer surface of the axis member by an adhesive layer.

6. The toner-conveying roller according to claim 1 , wherein the axis member is cored bar composed of a solid metal body.

7. The toner-conveying roller according to claim 1 , wherein the axis member is metal shaft which is a hollow metal cylindrical body.

Assignees

• Kusano Satoru
• Sato Junichiro
• Seki Katsuya
• Otsuka Masaru
• Takeda Youhei
• Bridgestone Corp

Inventors

• Kusano Satoru
• Sato Junichiro
• Seki Katsuya
• Otsuka Masaru
• Takeda Youhei

Classifications

• Y10T428/249953

  Composite having voids in a component [e.g., porous, cellular, etc.] · CPC title

• B32B5/18

  characterised by features of a layer {of} foamed material · CPC title

• Y10T428/249958

  Void-containing component is synthetic resin or natural rubbers · CPC title

• G03G15/1685 Primary

  Structure, details of the transfer member, e.g. chemical composition · CPC title

• G03G2215/1614

  Transfer roll · CPC title