Electrophotographic photoreceptor, process cartridge, and image-forming apparatus

Patent metadata

Field	Value
Publication number	US-11048181-B2
Application number	US-201916514442-A
Country	US
Kind code	B2
Filing date	Jul 17, 2019
Priority date	Feb 8, 2019
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer disposed on the conductive substrate. An outermost surface layer of the electrophotographic photoreceptor contains fluorine-containing resin particles and a fluorine-containing graft polymer having a fluorinated alkyl group. In an infrared absorption spectrum of the fluorine-containing graft polymer, a ratio of a peak area in a wavenumber range of from 1,020 cm−1 to 1,308 cm−1 to a peak area in a wavenumber range of from 1,673 cm−1 to 1,779 cm−1 is 2.7 or more and 4.8 or less.

First claim

What is claimed is:

1. An electrophotographic photoreceptor comprising:
a conductive substrate; and
a photosensitive layer disposed on the conductive substrate,
wherein an outermost surface layer of the electrophotographic photoreceptor contains fluorine-containing resin particles and a fluorine-containing graft polymer having a fluorinated alkyl group,
the electrophotographic photoreceptor is configured such that, in an infrared absorption spectrum of the fluorine-containing graft polymer, a ratio of a peak area in a wavenumber range of from 1,020 cm −1 to 1,308 cm −1 to a peak area in a wavenumber range of from 1,673 cm −1 to 1,779 cm −1 is 3.5 or more and 4.8 or less, and
a number of carboxyl groups in the fluorine-containing resin particles is 0 or more and 30 or less per 10 6 carbon atoms, and an amount of a basic compound in the fluorine-containing resin particles is 0 ppm or more and 3 ppm or less.

2. The electrophotographic photoreceptor according to claim 1 , wherein the fluorine-containing graft polymer is a polymer obtained by copolymerization of at least a polymerizable compound having a fluorinated alkyl group and a polymerizable compound that does not have a fluorinated alkyl group and that has an ester group.

3. The electrophotographic photoreceptor according to claim 2 , wherein the polymer is a fluorinated alkyl group-containing polymer that has a structural unit represented by general formula (FA) and a structural unit represented by general formula (FB):

where R F1 , R F2 , R F3 , and R F4 each independently represent a hydrogen atom or an alkyl group; X F1 represents an alkylene chain, a halogen-substituted alkylene chain, —S—, —O—, —NH—, or a single bond; Y F1 represents an alkylene chain, a halogen-substituted alkylene chain, —(C fx H 2fx-1 (OH))—, or a single bond; Q F1 represents —O— or —NH—; fl, fm, and fn each independently represent an integer of 1 or more; fp, fq, fr, and fs each independently represent an integer of 0 or 1 or more; ft represents an integer of 1 or more and 7 or less; and fx represents an integer of 1 or more.

4. The electrophotographic photoreceptor according to claim 1 , wherein the fluorine-containing graft polymer has a weight-average molecular weight Mw of 20,000 or more and 200,000 or less.

5. The electrophotographic photoreceptor according to claim 4 , wherein the fluorine-containing graft polymer has a weight-average molecular weight Mw of 50,000 or more and 200,000 or less.

6. The electrophotographic photoreceptor according to claim 1 , wherein a content of the fluorine-containing graft polymer is 0.5% by mass or more and 10% by mass or less relative to the fluorine-containing resin particles.

7. The electrophotographic photoreceptor according to claim 1 , wherein the number of carboxyl groups is 0 or more and 20 or less per 10 6 carbon atoms, and the amount of the basic compound is 0 ppm or more and 3 ppm or less.

8. The electrophotographic photoreceptor according to claim 7 , wherein the number of carboxyl groups is 0 or more and 20 or less per 10 6 carbon atoms, and the amount of the basic compound is 0 ppm or more and 1.5 ppm or less.

9. The electrophotographic photoreceptor according to claim 1 , wherein the basic compound is an amine compound.

10. The electrophotographic photoreceptor according to claim 1 , wherein the basic compound has a boiling point of 40° C. or higher and 130° C. or lower.

11. The electrophotographic photoreceptor according to claim 1 , wherein an amount of perfluorooctanoic acid in the fluorine-containing resin particles is 0 ppb or more and 25 ppb or less.

12. The electrophotographic photoreceptor according to claim 11 , wherein the amount of perfluorooctanoic acid in the fluorine-containing resin particles is 0 ppb or more and 20 ppb or less.

13. A process cartridge detachably attachable to an image-forming apparatus, the process cartridge comprising:
the electrophotographic photoreceptor according to claim 1 .

14. An image-forming apparatus comprising:
the electrophotographic photoreceptor according to claim 1 ;
a charging unit that charges a surface of the electrophotographic photoreceptor;
an electrostatic latent image-forming unit that forms an electrostatic latent image on the charged surface of the electrophotographic photoreceptor;
a developing unit that develops the electrostatic latent image formed on the surface of the electrophotographic photoreceptor by using a developer that contains a toner to form a toner image; and
a transfer unit that transfers the toner image onto a surface of a recording medium.

Assignees

• Fujifilm Business Innovation Corp

Inventors

• Iwasaki Masahiro
• Yamada Wataru
• Fujii Ryosuke
• Kusano Keisuke
• FUKUI Taisuke
• Okazaki Yuto

Classifications

• G03G5/047

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

• C08F14/26

  Tetrafluoroethene · CPC title

• C09D127/06 Primary

  Homopolymers or copolymers of vinyl chloride · CPC title

• C08F290/062

  Polyethers · CPC title

• G03G5/14734

  Polymers comprising at least one carboxyl radical, e.g. polyacrylic acid, polycrotonic acid, polymaleic acid; Derivatives thereof, e.g. their esters, salts, anhydrides, nitriles, amides · CPC title