Electrophotographic photoreceptor and resin composition

• US 9,494,883 B2
• Filed: 03/13/2012
• Issued: 11/15/2016
• Est. Priority Date: 03/17/2011
• Status: Active Grant

• Current Assignee: Idemitsu Kosan Company Limited
• Original Assignee: Idemitsu Kosan Company Limited
• Inventors: Morishita, Hironobu, Hikosaka, Takaaki
• Primary Examiner(s): Chea, Thorl
• Application Number:
  US14/001,419
• Publication Number:
  US 20140011128A1
• Time in Patent Office: 1,708 Days
• Field of Search: 430/56, 430/70, 430/71, 430/96
• US Class Current: 1/1
• CPC Class Codes: C08L 69/00 Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• CPC Class Codes: G03G 5/056 Polyesters
• CPC Class Codes: G03G 5/0564 Polycarbonates
• CPC Class Codes: G03G 5/0764 triarylamine
• CPC Class Codes: G03G 5/0765 alkenylarylamine
• CPC Class Codes: G03G 5/0766 benzidine
• CPC Class Codes: G03G 5/0767 comprising hydrazone moiety
• CPC Class Codes: G03G 5/14752 Polyesters
• CPC Class Codes: G03G 5/14756 Polycarbonates

Abstract

An electrophotographic photoreceptor that satisfies excellent transparency, abrasion resistance, and electrophotographic properties (including sensitivity and residual potential after light irradiation) all together is provided. Specifically, an electrophotographic photoreceptor and a resin composition that include therein (1) a polycarbonate resin (A) having a structural unit represented by the following formula (I) and (2) at least one selected from a polycarbonate resin (B) synthesized from a source material that includes therein a bisphenol represented by the following formula (II) and a polyester resin (B′) synthesized from a source material that includes therein a bisphenol represented by the following formula (II). In formulas (I) and (II), each of R^a, R^b, R^c, R^d, R^e, and R^f represents, independently from one another, a substituted or non-substituted alkyl group, a substituted or non-substituted cycloalkyl group, or a substituted or non-substituted phenyl group. Each of p, q, r, s, t, and u represents, independently from one another, an integer of 0 to 4. R^g represents an alkyl group. X represents an alkylene group, an isopropylidene group, a sec-butylidene group, a cycloalkylene group, a cycloalkylidene group, or the like. Y represents a single bond or —O—. Each of m^A and n^A represents a composition ratio (mole ratio) of the structural unit in the round brackets.

Claims

1. An electrophotographic photoreceptor, comprising an electroconductive substrate and a photoreceptor layer,

the photoreceptor layer comprising:

a polycarbonate resin (A) that has a structural unit represented by the following formula (I); and

at least one selected from a polycarbonate resin (B) having a structural unit represented by the following formula (IV) and a polyester resin (B′

) having a structural unit represented by the following formula (V);

n^A/(m^A +n^A) in the formula (I) is from 0.25 to 0.7, and

n^B/(m^B +n^B) in the formula (IV) is from 0.1 to 0.7;

2. The electrophotographic photoreceptor according to claim 1, wherein, the content ratio of the polycarbonate resin (A) with respect to the total amount of the polycarbonate resin (A), the polycarbonate rein (B), and the polyester resin (B′

), that is (A)/((A)+(B)+(B′

)), is from 0.5 to 0.99 by mass ratio.

3. The electrophotographic photoreceptor according to claim 1, wherein, the structural unit represented by formula (I) is a structural unit described below,

4. The electrophotographic photoreceptor according to claim 1, comprising, as a binder layer of a photoreceptor layer, the polycarbonate resin (A) and at least one selected from the polycarbonate resin (B) and the polyester resin (B′

).

5. The electrophotographic photoreceptor according to claim 1, wherein, at least one selected from the polycarbonate resin (A), the polycarbonate resin (B), and the polyester resin (B′

) includes therein a polyalkylsiloxane structural unit represented by the following formula (VI),

6. A resin composition, comprising:

(1) a polycarbonate resin (A) that has a structural unit represented by the following formula (I); and

(2) at least one selected from a polycarbonate resin (B) having a structural unit represented by the following formula (IV) and a polyester resin (B′

) having a structural unit represented by the following formula (V);

n^A/(m^A +n^A) in the formula (I) is from 0.25 to 0.7, and

n^B/(m^B +n^B) in the formula (IV) is from 0.1 to 0.7;