Electrophotographic photoconductor

• US 5,804,343 A
• Filed: 01/24/1996
• Issued: 09/08/1998
• Est. Priority Date: 10/20/1993
• Status: Expired due to Fees

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Niimi, Tatsuya, Umeda, Minoru
• Primary Examiner(s): Rodee, Christopher D.
• Application Number:
  US08/590,900
• Time in Patent Office: 958 Days
• Field of Search: 430/58, 430/59, 430/96
• US Class Current: 430/58.2
• CPC Class Codes: G03G 5/047 characterised by the charge-generation layers or charge transport layers G03G5/0433 and G03G5/0436 take precedence
• CPC Class Codes: G03G 5/0764 triarylamine
• CPC Class Codes: G03G 5/0766 benzidine
• CPC Class Codes: G03G 5/0767 comprising hydrazone moiety
• CPC Class Codes: G03G 5/078 comprising silicon atoms

Abstract

An electrophotographic photoconductor including an electroconductive support and a photoconductive layer formed thereon, which has at least a charge generation layer containing a charge generating material and a polymeric charge transporting material, and a charge transport layer containing a polymeric charge transporting material.

Claims

1. An electrophotographic photoconductor comprising an electroconductive support and a photoconductive layer formed thereon, which comprises at least a charge generation layer comprising a charge generating material selected from the group consisting of azo pigments, perinone pigments and squaraines, and a polymeric charge transporting material, and a charge transport layer comprising a polymeric charge transporting material,

wherein said polymeric charge transporting material in said charge generation layer is selected from the group consisting of polysilylene, a polymer having a hydrazone structure on the main chain and/or side chain thereof, and a polymer having a tertiary amine structure on the main chain and/or side chain thereof.

2. The electrophotographic photoconductor as claimed in claim 1, wherein said polymeric charge transporting material for use in said charge generation layer is polysilylene.

3. The electrophotographic photoconductor as claimed in claim 1, wherein said polymeric charge transporting material for use in said charge generation layer is a polymer having a hydrazone structure on the main chain and/or side chain thereof.

4. The electrophotographic photoconductor as claimed in claim 1, wherein said polymeric charge transporting material for use in said charge generation layer is a polymer having a tertiary amine structure on the main chain and/or side chain thereof.

5. The electrophotographic photoconductor of claim 1, wherein said charge generating material is said azo pigment.

6. The electrophotographic photoconductor of claim 5, wherein said polymeric charge transporting material in said charge generation layer is polysilylene.

7. The electrophotographic photoconductor of claim 5, wherein said polymeric charge transporting material in said charge generation layer is a polymer having a hydrazone structure on the main chain and/or side chain thereof.

8. The electrophotographic photoconductor of claim 5, wherein said polymeric charge transporting material in said charge generation layer is a polymer having a tertiary amine structure on the main chain and/or side chain thereof.

9. The electrophotographic photoconductor of claim 5, wherein said polymeric charge transporting material in said charge generation layer is a polymer having a weight-average molecular weight of 1,000-2,000,000.

10. The electrophotographic photoconductor of claim 5, wherein the weight-average molecular weight of said polymeric charge transporting material in said charge generation layer is 10,000 to 1,000,000.

11. The electrophotographic photoconductor of claim 5, wherein said charge transport layer comprises only polymeric charge transport materials.

12. The electrophotographic photoconductor of claim 5, wherein said charge transporting material in said charge transport layer is a polymeric material having a carbazole ring on the main chain and/or side chain thereof.

13. The electrophotographic photoconductor of claim 1, wherein said charge transport layer comprises only polymeric charge transport materials.

14. The electrophotographic photoconductor of claim 1, wherein said charge transporting material in said charge transport layer is a polymeric material having a carbazole ring on the main chain and/or side chain thereof.