Electrophotographic device member

1. An electrophotographic device member for use in an electrophotographic device comprising:

a modified rubber elastic body as a material for a portion including a surface of the electrophotographic device member,

the modified rubber elastic body comprising

a rubber elastic body with rubber elasticity; and

a surface-treated layer composed of a cured product of photocurable composition impregnated into the rubber elastic body from the surface of the rubber elastic body,

the photocurable composition comprising:

a (meth)acrylic monomer;

a photopolymerizable polymer having a silicone group and/or a fluorine-containing group, and a (meth)acryloyl group in a molecule; and

a photopolymerization initiator.

2. The electrophotographic device member according to claim 1 ,

wherein the photopolymerizable polymer is composed of a copolymer comprising:

a first polymerization unit; and/or

a second polymerization unit; and

a third polymerization unit,

the first polymerization unit being derived from a (meth)acrylate having a silicone group in a molecule,

the second polymerization unit being derived from a (meth)acrylate having a fluorine-containing group in a molecule, and

the third polymerization unit being derived from a (meth)acrylate having an hydroxyl group in a molecule, the hydroxyl group being chemically modified with a molecule having a (meth)acryloyl group.

3. The electrophotographic device member according to claim 2 ,

wherein the copolymer further comprises a fourth polymerization unit derived from a (meth)acrylate having an alkyl group.

4. The electrophotographic device member according to claim 1 ,

wherein the silicone group comprises a polydimethylsiloxane skeleton formed by repetition of a dimethylsiloxane unit, and

wherein the fluorine-containing group is a perfluoroalkyl group.

5. The electrophotographic device member according to claim 2 ,

wherein the silicone group comprises a polydimethylsiloxane skeleton formed by repetition of a dimethylsiloxane unit, and

wherein the fluorine-containing group is a perfluoroalkyl group.

6. The electrophotographic device member according to claim 3 ,

wherein the silicone group comprises a polydimethylsiloxane skeleton formed by repetition of a dimethylsiloxane unit, and

wherein the fluorine-containing group is a perfluoroalkyl group.

7. The electrophotographic device member according to claim 3 ,

wherein the (meth)acrylate having the alkyl group is methyl methacrylate or butyl methacrylate.

8. The electrophotographic device member according to claim 1 ,

wherein the surface-treated layer has a number of the silicone groups and/or the fluorine-containing groups on a surface side of the surface-treated layer.

9. The electrophotographic device member according to claim 2 ,

wherein the surface-treated layer has a number of the silicone groups and/or the fluorine-containing groups on a surface side of the surface-treated layer.

10. The electrophotographic device member according to claim 3 ,

wherein the surface-treated layer has a number of the silicone groups and/or the fluorine-containing groups on a surface side of the surface-treated layer.

11. The electrophotographic device member according to claim 1 ,

wherein the photopolymerizable polymer is at least one kind selected from polymers having molecular structures represented by the following formulae (1) and (2):

(wherein R 1 represents H or CH 3 ; R 2 represents an alkyl group; p ranges from 0 to 60, q ranges from 0 to 60, r ranges from 0.01 to 60, s ranges from 0 to 95 by mol %, provided that p+q≠0; and n is an integer of 2 to 270)

(wherein R 1 represents H or CH 3 ; R 2 represents an alkyl group; p ranges from 0 to 60, q ranges from 0 to 60, r ranges from 0.01 to 60, s ranges from 0 to 95 by mol %, provided that p+q≠0; and n is an integer of 2 to 270.

12. The electrophotographic device member according to claim 11 ,

wherein the surface-treated layer has a number of the silicone groups and/or the fluorine-containing groups on a surface side of the surface-treated layer.

13. The electrophotographic device member according to claim 1 ,

wherein the (meth)acrylic monomer is a polyfunctional monomer having a plurality of (meth)acryloyl groups.

14. The electrophotographic device member according to claim 2 ,

wherein the (meth)acrylic monomer is a polyfunctional monomer having a plurality of (meth)acryloyl groups.

15. The electrophotographic device member according to claim 3 ,

wherein the (meth)acrylic monomer is a polyfunctional monomer having a plurality of (meth)acryloyl groups.

16. The electrophotographic device member according to claim 12 ,

wherein the (meth)acrylic monomer has a number average molecular weight within the range of 200 to 700.

17. The electrophotographic device member according to claim 1 , which is a developing member, an electrifying member, a transferring member or a cleaning member to be incorporated into an electrophotographic image forming device.

18. The electrophotographic device member according to claim 2 , which is a developing member, an electrifying member, a transferring member or a cleaning member to be incorporated into an electrophotographic image forming device.

19. The electrophotographic device member according to claim 3 , which is a developing member, an electrifying member, a transferring member or a cleaning member to be incorporated into an electrophotographic image forming device.

20. The electrophotographic device member according to claim 11 , which is a developing member, a charging member, a transferring member or a cleaning member to be incorporated into an electrophotographic image forming device.