Image bearer protective agent, protective layer forming device, image forming method, image forming apparatus, and process cartridge

Patent metadata

Field	Value
Publication number	US-9753426-B2
Application number	US-201615270811-A
Country	US
Kind code	B2
Filing date	Sep 20, 2016
Priority date	Sep 30, 2015
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

An image bearer protective agent is provided. The image bearer protective agent includes a fatty acid metal salt and an inorganic lubricant. The inorganic lubricant includes a first inorganic lubricant having a tap density of from 0.30 to 0.8 g/cm 2 .

First claim

What is claimed is:

1. An image bearer protective agent comprising:
a fatty acid metal salt; and
an inorganic lubricant including a first inorganic lubricant having a tap density of from 0.30 to 0.8 g/cm 2 .

2. The image bearer protective agent of claim 1 , wherein the inorganic lubricant further includes a second inorganic lubricant having a tap density of 0.25 g/cm 2 or less.

3. The image bearer protective agent of claim 2 , wherein the second inorganic lubricant includes at least one member selected from the group consisting of mica, boron nitride, molybdenum disulfide, tungsten disulfide, talc, kaolin, montmorillonite, calcium fluoride, silica, graphite, polymethyl methacrylate resin, polytetrafluoroethylene resin, melamine formaldehyde, organic molybdenum, and silicone resin.

4. The image bearer protective agent of claim 1 , wherein the first inorganic lubricant includes boron nitride.

5. The image bearer protective agent of claim 1 , wherein the fatty acid metal salt includes at least one member selected from the group consisting of zinc stearate, calcium stearate, and zinc laurate.

6. The image bearer protective agent of claim 1 , wherein the image bearer protective agent has a density of from 1.11 to 1.190 g/cm 3 .

7. The image bearer protective agent of claim 1 , wherein a mass ratio of the fatty acid metal salt to the inorganic lubricant ranges from 70/30 to 98/2.

8. The image bearer protective agent of claim 1 , wherein the image bearer protective agent is a compression-molded product of a mixture of the fatty acid metal salt and the inorganic lubricant.

9. A protective layer forming device comprising:
the image bearer protective agent of claim 1 ; and
an image bearer protective agent supply member to supply the image bearer protective agent onto a surface of an image bearer.

10. The protective layer forming device of claim 9 , wherein the image bearer protective agent supply member has a foam layer.

11. The protective layer forming device of claim 10 , wherein the foam layer is an open-cell layer.

12. The protective layer forming device of claim 9 , further comprising:
a protective layer forming member to press the image bearer protective agent supplied onto the surface of the image bearer against the surface, to form the image bearer protective agent into a protective layer on the surface.

13. An image forming apparatus comprising:
an image bearer;
an electrostatic latent image forming device to form an electrostatic latent image on the image bearer;
a developing device to develop the electrostatic latent image with toner to form a visible image;
a transfer device to transfer the visible image onto a recording medium; and
the protective layer forming device of claim 9 to supply the image bearer protective agent onto a surface of the image bearer after the visible image has been transferred therefrom, to form the image bearer protective agent into a protective layer.

14. The image forming apparatus of claim 13 , further comprising a cleaner disposed downstream from the transfer device and upstream from the protective layer forming device, to remove residual toner particles remaining on the surface of the image bearer.

15. A process cartridge comprising:
an image bearer; and
the protective layer forming device of claim 9 to supply the image bearer protective agent onto a surface of the image bearer and form the image bearer protective agent into a protective layer.

16. An image forming method comprising:
forming an electrostatic latent image on an image bearer;
developing the electrostatic latent image with toner to form a visible image;
transferring the visible image onto a recording medium;
supplying the image bearer protective agent of claim 1 onto a surface of the image bearer after the visible image has been transferred therefrom; and
forming the image bearer protective agent into a protective layer.

Assignees

• Komito Kenji
• Nakai Hiroshi
• Yamamoto Kohsuke
• Mizusawa Hiroshi
• Akiyama Sho
• Ricoh Co Ltd

Inventors

• Komito Kenji
• Nakai Hiroshi
• Yamamoto Kohsuke
• Mizusawa Hiroshi
• Akiyama Sho

Classifications

• G03G21/0094 Primary

  fatigue treatment of the photoconductor · CPC title

• C10M2201/087

  Boron oxides, acids or salts · CPC title

• G03G2215/0129

  horizontal medium transport path at the secondary transfer · CPC title

• C10M2201/065

  Sulfides; Selenides; Tellurides · CPC title

• C10M2201/081

  containing halogen · CPC title