Photosensitive member for electrophotography

• US 20050019682A1
• Filed: 12/11/2003
• Published: 01/27/2005
• Est. Priority Date: 07/22/2003
• Status: Active Grant

• Current Assignee: Konica Minolta Business Technologies Incorporated (Konica Minolta Inc.)
• Original Assignee: Konica Minolta Business Technologies Incorporated (Konica Minolta Inc.)
• Inventors: Ishida, Takeshi, Tokutake, Shigeaki, Inagaki, Keiichi
• Granted Patent: US 6,933,090 B2
• Time in Patent Office: Days
• US Class Current: 430/58.50
• CPC Class Codes: G03G 5/14726 Halogenated polymers
• CPC Class Codes: G03G 5/14756 Polycarbonates
• CPC Class Codes: G03G 5/14773 Polycondensates comprising silicon atoms in the main chain

Abstract

The present invention relates to a photosensitive member for electrophotography which comprises a electroconductive support and one or more layers that include a photosensitive layer formed on the surface of the electroconductive support, wherein the outermost layer comprises binder resin, fluororesin particles A and fluororesin particles B.

Claims

1. A photosensitive member for electrophotography which comprises:

a electroconductive support and one or more layers that include a photosensitive layer formed on the surface of the electroconductive support, wherein

(i) the outermost layer comprises binder resin, fluororesin particles A and fluororesin particles B,

(ii) the fluororesin particles A have an average primary diameter of less than 0.2 μ

m and a peak half-value width of the X-ray diffraction pattern of not less than 0.36,

(iii) the fluororesin particles B have an average primary diameter of not less than 0.2 μ

m and a peak half-value width of the X-ray diffraction pattern of less than 0.36, and

(iv) a weight ratio of the fluororesin particles A and the fluororesin particles B is within 8;

2 to 2;

8.

2. The photosensitive member in claim 1, wherein the weight ratio of the fluororesin particles A and the fluororesin particles B is within 7:

3 to 3;

7.

3. The photosensitive member in claim 1, wherein the fluororesin particles A have an average primary diameter of 0.01 to 0.15 μ

m.

4. The photosensitive member in claim 1, wherein the fluororesin particles B have an average primary diameter of 0.25 to 0.39 μ

m.

5. The photosensitive member in claim 1, the fluororesin particles A have a peak half-value width of the X-ray diffraction pattern of 0.37 to 0.50.

6. The photosensitive member in claim 1, the fluororesin particles B have a peak half-value width of the X-ray diffraction pattern of 0.10 to 0.32.

7. The photosensitive member in claim 1, wherein the fluororesin particles A and B comprise polytetrafluoroethylene resin.

8. The photosensitive member in claim 1, wherein the total content of the fluororesin particles A and the fluororesin particles B is within 10 to 150 parts by weight to 100 parts by weight of the binder resin in the outermost layer.

9. The photosensitive member in claim 1, wherein the binder resin of the outermost layer is siloxane denatured polycarbonate.

10. The photosensitive member in claim 9, wherein the siloxane denatured polycarbonate has a viscosity mean molecular weight of 20,000 to 100,000.

11. A photosensitive member for electrophotography comprising a charge generating layer, a first charge transfer layer and a second charge transfer layer laminated on a electroconductive support in this order, wherein

(i) the second charge transfer layer comprises binder resin, a charge transfer material, fluororesin particles A and fluororesin particles B,

(ii) the fluororesin particles A have an average primary diameter of less than 0.2 μ

m and a peak half-value width of the X-ray diffraction pattern of not less than 0.36,

(iii) the fluororesin particles B have an average primary diameter of not less than 0.2 μ

m and a peak half-value width of the X-ray diffraction pattern of less than 0.36, and

(iv) a weight ratio of the fluororesin particles A and the fluororesin particles B is within 8;

2 to 2;

8.

12. The photosensitive member in claim 11, wherein the binder resin of the second charge transfer layer is a siloxane denatured polycarbonate.

13. The photosensitive member in claim 12, wherein the siloxane denatured polycarbonate has a viscosity mean molecular weight of 20,000 to 100,000.

14. The photosensitive member in claim 11, wherein the fluororesin particles A and the fluororesin particles B comprise polytetrafluoroethylene resin.

15. The photosensitive member in claim 11, wherein the first charge transfer layer and the second charge transfer layer comprise an oxidation inhibitor selected from the group consisting of hindered phenols, hindered amines and benzotriazoles.

16. The photosensitive member in claim 11, wherein the fluororesin particles A have an average primary diameter of 0.01 to 0.15 μ

m.

17. The photosensitive member in claim 11, wherein the fluororesin particles B have an average primary diameter of 0.25 to 0.39 μ

m.

18. The photosensitive member in claim 11, the fluororesin particles A have a peak half-value width of the X-ray diffraction pattern of 0.37 to 0.50.

19. The photosensitive member in claim 11, the fluororesin particles B have a peak half-value width of the X-ray diffraction pattern of 0.10 to 0.32.

20. The photosensitive member in claim 11, wherein the total content of the fluororesin particles A and the fluororesin particles B is within 10 to 150 parts by weight to 100 parts by weight of the binder resin in the second charge transfer layer.