Electrophotographic photoreceptor, electrophotographic photoreceptor cartridge and image forming apparatus

1. An electrophotographic photoreceptor comprising: a conductive support; and a photosensitive layer on the conductive support, wherein

the photosensitive layer comprises a polymer A containing a repeating structural unit represented by Formula (1) and a repeating structural unit represented by Formula (2), and a polymer B not containing the repeating structural unit of Formula (1) but containing the repeating structural unit of Formula (2):

wherein

R 1 represents a hydrogen atom or a methyl group; R 2 represents a single bond, a divalent hydrocarbon group which may have an ether moiety, or a divalent polyether group which may have a substituent; and R 3 represents a polycarbonate residue or a polyester residue;

wherein,

R 4 represents a hydrogen atom or a methyl group; R 5 represents a single bond, or a divalent hydrocarbon group which may have an ether moiety; and Rf 1 represents a linear perfluoroalkyl group having 2 to 6 carbon atoms, a branched perfluoroalkyl group having 2 to 6 carbon atoms, an alicyclic perfluoroalkyl group having 2 to 6 carbon atoms, or a group of Formula (3); and

wherein,

Rf 2 and Rf 3 each independently represent a fluorine atom or a trifluoromethyl group;

Rf 4 represents a linear perfluoroalkyl group having 1 to 6 carbon atoms or a branched perfluoroalkyl group having 1 to 6 carbon atoms, and n 1 represents an integer of 1 to 3.

2. The electrophotographic photoreceptor according to claim 1 , wherein the polymer B further comprises a repeating structural unit of Formula (10):

wherein X 1 , X 2 and X 3 each independently represent a hydrogen atom, a hydrocarbon group which may have a substituent, or a group represented by Formula (11); R 11 , R 12 , R 15 and R 16 each independently represent a hydrogen atom, or a hydrocarbon group which may have a substituent; R 14 represents a hydrocarbon group which may have a substituent or a group represented by Formula (13); Z represents a hydrogen atom or a group derived from a radical polymerization initiator, and n 0 represents an integer of 1 or more;

wherein,

R 21 represents a hydrogen atom, a hydrocarbon group which may have a substituent, or a heterocyclic group which may have a substituent; and

wherein,

n 31 , n 32 , n 33 , and n 34 , each independently represent 0 or an integer of 1 or more; R 31 represents an alkylene group, a halogen-substituted alkylene group, —(C m H 2m-1 (OH))— or a single bond; and R 32 represents an alkylene group, a halogen-substituted alkylene group, —S—,—O—, —NH— or a single bond, and m represents an integer of 1 or more.

3. The electrophotographic photoreceptor according to claim 1 , wherein the polymer A further comprises a repeating structural unit of Formula (10).

4. The electrophotographic photoreceptor according to claim 1 , wherein a content ratio of the polymer A to the polymer B in the photosensitive layer is 4:1 to 1:4 in terms of mass ratio.

5. The electrophotographic photoreceptor according to claim 1 wherein the photosensitive layer contains a filler.

6. The electrophotographic photoreceptor according to claim 5 , wherein the filler comprises fluorine atom-containing resin particles.

7. The electrophotographic photoreceptor according to claim 5 , wherein a total content of the polymer A and the polymer B is 1 mass % or more and 20 mass % or less relative to a mass of the filler.

8. The electrophotographic photoreceptor according to claim 1 , wherein the photosensitive layer is an outermost surface layer.

9. The electrophotographic photoreceptor according to claim 1 , wherein the photosensitive layer is a lamination type photosensitive layer in which a charge generation layer and a charge transport layer are sequentially laminated from the conductive support side.

10. The electrophotographic photoreceptor according to claim 9 , wherein the photosensitive layer contains a filler, and the polymer A, the polymer B, and the filler are all contained in the charge transport layer.

11. An electrophotographic photoreceptor cartridge comprising the electrophotographic photoreceptor according to claim 1 .

12. An image forming apparatus comprising the electrophotographic photoreceptor according to claim 1 .