Triphenylamine derivative, electrophotographic photosensitive member, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-9684253-B2
Application number	US-201514837691-A
Country	US
Kind code	B2
Filing date	Aug 27, 2015
Priority date	Aug 29, 2014
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

A triphenylamine derivative is represented by general formula (1). In general formula (1), R 1 to R 7 each represent, independently of one another, a chemical group selected from the group consisting of a halogen atom, an optionally substituted alkyl group having a carbon number of at least 1 and no greater than 6, an optionally substituted alkoxy group having a carbon number of at least 1 and no greater than 6, and an optionally substituted aryl group having a carbon number of at least 6 and no greater than 12. Also, k, l, m, n, o, and p each represent, independently of one another, an integer of at least 0 and no greater than 4. When any of k, l, m, n, o, or p represents an integer greater than 1, chemical groups R 3 , R 4 , R 5 , R 6 , or R 7 bonded to the same aromatic ring may be the same or different.

First claim

What is claimed is:

1. An electrophotographic photosensitive member comprising
a photosensitive layer containing a charge generating material, a hole transport material, and a binder resin, wherein
the photosensitive layer is either a multi-layer type photosensitive layer or a single-layer type photosensitive layer,
the multi-layer type 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 that is located on the charge generating layer,
the single-layer type photosensitive layer contains the charge generating material, the hole transport material, and the binder resin, and
the hole transport material is a triphenylamine derivative represented by chemical formula (HT-2), (HT-3), (HT-4), (HT-5), (HT-6), (HT-7) or (HT-8)

2. The electrophotographic photosensitive member according to claim 1 , wherein
the electrophotographic photosensitive member is used as an image bearing member in an image forming apparatus including a charging section that applies a direct current voltage to the image bearing member while in contact with the image bearing member,
the charging section charges a surface of the image bearing member to a positive polarity, and
the photosensitive layer is the single-layer type photosensitive layer.

3. An image forming apparatus comprising;
an image bearing member;
a charging section configured to charge a surface of the image bearing member;
a light exposure section configured to form an electrostatic latent image on the surface of the image bearing member by exposing the surface of the image bearing member to light while in a charged state;
a developing section configured to develop the electrostatic latent image into a toner image; and
a transfer section configured to transfer the toner image onto a transfer target from the image bearing member, wherein
the image bearing member is the electrophotographic photosensitive member according to claim 1 .

4. The image forming apparatus according to claim 3 , wherein
the charging section applies a direct current voltage to the image bearing member while in contact with the image bearing member,
the charging section charges the surface of the image bearing member to a positive polarity, and
the photosensitive layer is the single-layer type photosensitive layer.

5. The image forming apparatus according to claim 3 , wherein
the transfer target is a recording medium, and
the image bearing member is in contact with the recording medium during transfer of the toner image onto the recording medium from the image bearing member by the transfer section.

6. The image forming apparatus according to claim 3 , wherein
the transfer section includes a primary transfer roller and a secondary transfer roller,
the transfer target is an intermediate transfer belt and a recording medium,
the primary transfer roller transfers the toner image onto the intermediate transfer belt from the image bearing member, and
the secondary transfer roller transfers the toner image onto the recording medium from the intermediate transfer belt.

7. The electrophotographic photosensitive member according to claim 1 , wherein the hole transport material is the triphenylamine derivative represented by chemical formula (HT-2), (HT-3) or (HT-7).

8. The electrophotographic photosensitive member according to claim 1 , wherein the hole transport material is the triphenylamine derivative represented by chemical formula (HT-2).

9. The electrophotographic photosensitive member according to claim 1 , wherein the hole transport material is the triphenylamine derivative represented by chemical formula (HT-4) or (HT-8).

10. The electrophotographic photosensitive member according to claim 1 , wherein the hole transport material is the triphenylamine derivative represented by chemical formula (HT-8).

11. The electrophotographic photosensitive member according to claim 1 , wherein
the photosensitive layer is the single-layer type photosensitive layer, and
the single-layer type photosensitive layer further contains a compound represented by chemical formula (ETM-2)

where, in the general formula (ETM-2), R 15 ′ represents a methyl group, R 16 ′ represents a methyl group, R′ represents a tert-butyl group, and R′ represents a tert-butyl group.

Assignees

• Kyocera Document Solutions Inc

Inventors

• Okada Hideki
• Kojima Kensuke
• Sugai Fumio
• Tsurumi Hiroki
• Yamamoto Yohei
• Miyamoto Eiichi

Classifications

• C07C217/80

  having amino groups and etherified hydroxy groups bound to carbon atoms of non-condensed six-membered aromatic rings · CPC title

• C07C211/54

  having amino groups bound to two or three six-membered aromatic rings · CPC title

• G03G5/0614

  Amines · CPC title

• C07C217/84

  the oxygen atom of at least one of the etherified hydroxy groups being further bound to an acyclic carbon atom · CPC title

• G03G5/0672

  containing two or more methine or polymethine groups · CPC title