SURFACE-TREATING LIQUID FOR CONDUCTIVE ELASTIC LAYER, METHOD OF SURFACE TREATMENT OF THE SAME, AND SURFACE-TREATED CONDUCTIVE MEMBER

• US 20100261002A1
• Filed: 10/27/2008
• Published: 10/14/2010
• Est. Priority Date: 10/31/2007
• Status: Abandoned Application

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Rubber Industries Limited
• Inventors: Tajima, Kei, Okuyama, Hideyuki
• Application Number:
  US12/740,307
• Publication Number:
  US 20100261002A1
• Time in Patent Office: Days
• US Class Current: 428/323
• CPC Class Codes: C08G 18/6216 Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
• CPC Class Codes: C08G 18/706 the liquid medium being water
• CPC Class Codes: C08G 18/792 formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
• CPC Class Codes: C08G 18/8064 with monohydroxy compounds
• CPC Class Codes: C08G 18/8077 Oximes
• CPC Class Codes: C08J 2321/00 Characterised by the use of unspecified rubbers
• CPC Class Codes: C08J 2475/00 Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/044 Forming conductive coatings; Forming coatings having anti-static properties
• CPC Class Codes: C08J 7/046 Forming abrasion-resistant coatings; Forming surface-hardening coatings
• CPC Class Codes: C08K 3/041 Carbon nanotubes
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: C09D 5/24 Electrically-conducting paints conductive materials H01B1/00
• CPC Class Codes: C09D 7/62 modified by treatment with other compounds
• CPC Class Codes: C09D 7/70 characterised by shape, e.g. fibres, flakes or microspheres
• CPC Class Codes: F16C 13/00 Rolls, drums, discs, or the like guide rollers in feeding webs B65H27/00; calender rolls, bearings therefor D21G1/02; rotary drums or rollers for heat-exchange or heat-transfer apparatus F28F5/02; Bearings or mountings therefor
• CPC Class Codes: G03G 15/0233 Structure, details of the charging member, e.g. chemical composition, surface properties
• CPC Class Codes: G03G 15/1685 Structure, details of the transfer member, e.g. chemical composition
• CPC Class Codes: G03G 2215/00396 Pick-up device
• CPC Class Codes: Y10T 428/25 : Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles

Abstract

A conductive member of a paper feed roller for use in an electrophotographic apparatus is provided which retains electrical conductivity in an adequate range, is effectively prevented from deteriorating in durability, and is reduced in the voltage dependence of electrical resistance and in resistance unevenness. This conductive member enables satisfactory print quality to be obtained over long. The conductive member comprises:

• a conductive elastic layer formed from one or more elastic materials selected from the group consisting of rubbers, resins, and thermoplastic elastomers; and a coating layer formed by applying a surface-treating liquid to the outer surface of the conductive elastic layer and then thermally curing the coating. The surface-treating liquid comprises:
  • a medium containing, dispersed and/or dissolved therein, either a polyisocyanate compound or a combination of a polyol compound and an isocyanate compound; and carbon nanotubes dispersed in the medium.

Claims

1-11. -11. (canceled)

12. A conductive member comprising a conductive elastic layer and a coating layer coating a surface of said conductive elastic layer,

wherein in said coating layer, carbon nanotubes are dispersed in a resin component consisting of a multi-isocyanate compound;

and said carbon nanotubes are contained in said coating layer at a ratio of not less than 0.5 mass % nor more than 5.0 mass %.

13. A conductive member according to claim 12, wherein isocyanate groups of said multi-isocyanate compound are blocked.

15. A conductive member, according to claim 12, consisting of a conductive roller,

wherein a thickness of said coating layer is not less than 1 μ

m nor more than 50 μ

m; and

a thickness of said conductive elastic layer is not less than 1 mm nor more than 10 mm;

in said conductive elastic layer, EPDM is dispersed in a mixture of a styrene thermoplastic elastomer and polypropylene resin; and

a resistance value of said conductive roller is 10⁵Ω

to 10⁸Ω

.

16. A conductive member, according to claim 15, which is a conductive roller to be mounted on an image-forming apparatus.

17. A method of forming a coating layer of a conductive member as defined in any one of claims 12 through 14, wherein after applying a surface-treating liquid consisting of a carbon nanotube-dispersed liquid in which oxidized carbon nanotubes are dispersed in water or a carbon nanotube-dispersed liquid in which carbon nanotubes are dispersed in water by using a surface-active agent to an outer surface of said conductive elastic layer, hardening heat treatment is carried out for said surface-treating liquid.

14. A conductive member comprising a conductive elastic layer and a coating layer coating a surface of said conductive elastic layer,

in said coating layer, carbon nanotubes are dispersed in polyurethane resin composed of a polyol compound of hydroxyl group-containing acrylic resin or a polyol compound of hydroxyl group-containing polyurethane resin and an isocyanate compound into which hydrophilic groups have been introduced;

and said carbon nanotubes are contained in said coating layer at a ratio of not less than 0.5 mass % nor more than 5.0 mass %.