ELECTROPHOTOGRAPHIC PHOTORECEPTOR BELT

• US 20100015541A1
• Filed: 08/21/2007
• Published: 01/21/2010
• Est. Priority Date: 08/23/2006
• Status: Active Grant

• Current Assignee: Mitsubishi Gas Chemical Company Incorporated (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Gas Chemical Company Incorporated (Mitsubishi Electric Corporation)
• Inventors: Ogawa, Noriyoshi
• Granted Patent: US 8,137,876 B2
• Time in Patent Office: Days
• US Class Current: 430/59.600
• CPC Class Codes: C08G 18/3206 aliphatic
• CPC Class Codes: C08G 18/3215 containing aromatic groups or benzoquinone groups
• CPC Class Codes: C08G 18/4238 derived from dicarboxylic acids and dialcohols
• CPC Class Codes: C08G 18/4277 Caprolactone and/or substituted caprolactone
• CPC Class Codes: C08G 18/61 Polysiloxanes
• CPC Class Codes: C08G 18/664 with compounds of group C08G18/3203
• CPC Class Codes: C08G 18/73 acyclic
• CPC Class Codes: C08L 2666/18 Polyesters or polycarbonates according to C08L67/00 - C08L69/00; Derivatives thereof
• CPC Class Codes: C08L 2666/20 Macromolecular compounds having nitrogen in the main chain according to C08L75/00 - C08L79/00; Derivatives thereof
• CPC Class Codes: C08L 69/00 Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• CPC Class Codes: C08L 75/04 Polyurethanes
• CPC Class Codes: G03G 5/0564 Polycarbonates
• CPC Class Codes: G03G 5/0575 Other polycondensates comprising nitrogen atoms with or without oxygen atoms in the main chain
• CPC Class Codes: G03G 5/0578 Polycondensates comprising silicon atoms in the main chain
• CPC Class Codes: G03G 5/0589 Macromolecular compounds characterised by specific side-chain substituents or end groups
• CPC Class Codes: G03G 5/10 Bases for charge-receiving or other layers
• CPC Class Codes: G03G 5/142 Inert intermediate layers

Abstract

An electrophotographic photoreceptor which is excellent in wear resistance and crack resistance and has a long photoreceptor lifetime can be produced by using a polycarbonate resin composition prepared by blending 100 parts by weight of a polycarbonate resin with 0.01 to 5 parts by weight of a silicone-modified polyurethane obtained by reacting (a) a diol component represented by the general formula (I) with (b) an active hydrogen containing polysiloxane compound, (c) a polyisocyanate component and, if necessary, (d) a chain extender as the material for the backing film of a photoreceptor belt. [Chemical formula 1](I) wherein R₁ and R₂ are each independently hydrogen or alkyl; R₃ is hydrogen, alkyl, alkoxy, halogeno or alkoxycarbonyl; M is a single bond, substituted or unsubstituted alkylene, or oxyalkylene; and n is an integer of 0 to 4.

Claims

1. A polycarbonate resin composition for a rear side reinforcing layer of an electrophotographic photoreceptor belt, which is a blend of (A) 100 parts by weight of a polycarbonate resin and (B) 0.01 to 5 parts by weight of silicone-modified polyurethane obtained by reacting a diol component (a) represented by the following general formula (I), an active hydrogen-containing polysiloxane compound (b), a polyisocyanate component (c) and, if necessary, a chain extender (d).

2. The polycarbonate resin composition for a rear side reinforcing layer according to claim 1, wherein said active hydrogen-containing polysiloxane compound (b) is a compound selected from the group consisting of active hydrogen-containing polysiloxane and a copolymer of active hydrogen-containing polysiloxane and caprolactone.

3. The polycarbonate resin composition for a rear side reinforcing layer according to claim 1, wherein the content of a siloxane component in said silicone-modified polyurethane is 5 to 80% by weight.

4. The polycarbonate resin composition for a rear side reinforcing layer according to claim 1, wherein said diol component represented by the general formula (I) is 2,2-bis(4-hydroxyphenyl)propane or an alkyleneoxide adduct of 2,2-bis(4-hydroxyphenyl)propane.

5. The polycarbonate resin composition for a rear side reinforcing layer according to claim 1, wherein said polycarbonate resin is produced by using as a raw material at least one bisphenol selected from the group consisting of 1,1′

-biphenyl-4,4′

-diol, 2,2-bis(4-hydroxyphenyl)propane, 1,1-bis(4-hydroxyphenyl)cyclohexane and 2,2-bis(4-hydroxy-3-methylphenyl)propane.

6. The polycarbonate resin composition for a rear side reinforcing layer according to claim 1, wherein the intrinsic viscosity of said polycarbonate resin is 1.0 to 1.6 dl/g.

7. An electrophotographic photoreceptor belt having a belt conductive support, a photosensitive layer and a rear side reinforcing layer, characterized in that the polycarbonate resin composition according to any one of claims 1 to 6 is used as a material for said rear side reinforcing layer.

8. The electrophotographic photoreceptor belt according to claim 7, wherein said photosensitive layer is a multilayer type photosensitive layer separated into a charge generating layer and a charge transport layer.

9. The electrophotographic photoreceptor belt according to claim 8, wherein a binder resin used for said charge transport layer is a polycarbonate resin.

10. The electrophotographic photoreceptor belt according to claim 9, wherein the intrinsic viscosity of said binder resin is 1.0 to 1.6 dl/g.

11. The electrophotographic photoreceptor belt according to claim 9, wherein said binder resin is a polycarbonate resin produced by using as a raw material at least one bisphenol selected from the group consisting of 1,1′

-biphenyl-4,4′

-diol, 2,2-bis(4-hydroxyphenyl)propane, 1,1-bis(4-hydroxyphenyl)cyclohexane and 2,2-bis(4-hydroxy-3-methylphenyl)propane.