Polyarylate resin and electrophotographic photosensitive member

Patent metadata

Field	Value
Publication number	US-10761439-B2
Application number	US-201715668759-A
Country	US
Kind code	B2
Filing date	Aug 4, 2017
Priority date	Aug 10, 2016
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

An electrophotographic photosensitive member includes a photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, and a binder resin. The binder resin contains a polyarylate resin represented by general formula (1). In general formula (1), r and s each represent an integer of at least 0 and no greater than 49 and t and u represents an integer of at least 1 and no greater than 50. Furthermore, r+s+t+u=100 and r+t=s+u. X and Y each represent, independently of one another, a divalent group represented by chemical formula (1-1), (1-2), (1-3), or (1-4).

First claim

What is claimed is:

1. An electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer, wherein
the photosensitive layer contains a charge generating material, a hole transport material, and a binder resin,
the binder resin contains a polyarylate resin represented by chemical formula (Resin-2) and having a viscosity average molecular weight of at least 10,000 and no greater than 51,000, and
the hole transport material contains a compound represented by general formula (2),

where, in the general formula (2),
Q 1 represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or a phenyl group optionally substituted with an alkyl group having 1 to 8 carbon atoms,
Q 2 represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or a phenyl group,
Q 3 , Q 4 , Q 5 , Q 6 , and Q 7 each represent, independently of one another, a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or a phenyl group,
adjacent two of Q 3 , Q 4 , Q 5 , Q 6 , and Q 7 optionally bond together to form a ring,
a represents an integer of at least 0 and no greater than 5, and
when a represents an integer of at least 2 and no greater than 5, chemical groups Q 2 bonded to the same phenyl group are the same or different from one another.

2. The electrophotographic photosensitive member according to claim 1 , wherein
in the general formula (2),
Q 1 represents a hydrogen atom or a phenyl group substituted with an alkyl group having 1 to 8 carbon atoms,
Q 2 represents an alkyl group having 1 to 8 carbon atoms,
Q 3 , Q 4 , Q 5 , Q 6 , and Q 7 each represent, independently of one another, a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or an alkoxy group having 1 to 8 carbon atoms,
adjacent two of Q 3 , Q 4 , Q 5 , Q 6 , and Q 7 optionally bond together to form a ring, and
a represents 0 or 1.

3. The electrophotographic photosensitive member according to claim 1 , wherein
the hole transport material is represented by chemical formula (HTM-1)

4. The electrophotographic photosensitive member according to claim 1 , wherein
the photosensitive layer includes a charge generating layer that contains the charge generating material and a charge transport layer that contains the hole transport material and the binder resin, and
the charge transport layer is a single-layer charge transport layer and disposed as a topmost layer.

5. The electrophotographic photosensitive member according to claim 1 , wherein
chemical groups Q 1 in the general formula (2) each represents a hydrogen atom.

Assignees

• Kyocera Document Solutions Inc

Inventors

• Azuma Jun
• Okawa Kensuke
• HASUNUMA Seiki
• Shimizu Tomofumi

Classifications

• G03G5/061473

  plural alkenyl groups linked directly to the same aryl group · CPC title

• G03G5/06147

  alkenylarylamine · CPC title

• G03G5/061443

  benzidine · CPC title

• G03G5/0672

  containing two or more methine or polymethine groups · CPC title

• G03G5/047

  characterised by the charge-generation layers or charge transport layers {(G03G5/0433 and G03G5/0436 take precedence)} · CPC title