Electrophotographic photoreceptor, process cartridge, and image forming apparatus

1. An electrophotographic photoreceptor, comprising:

a functional layer containing

a polymer of a first compound having a chain polymerizable functional group and a charge transporting skeleton in one molecule, and

at least one second compound selected from the group consisting of a compound including at least one kind of a repeating unit represented by the following formula (BB) and having a weight average molecular weight of 10000 or less, a phthalic ester, a trimellitic ester, a fatty acid ester, a polyhydric alcohol ester, and a polyhydric alcohol ether:

wherein in the formula (BB), A and B each independently represent an alkylene group having 1 to 20 carbon atoms.

2. The electrophotographic photoreceptor according to claim 1 , wherein the second compound is a compound which is liquid at 25° C. and under 1 atmosphere.

3. The electrophotographic photoreceptor according to claim 1 , wherein the functional layer is an outermost layer.

4. The electrophotographic photoreceptor according to claim 1 , wherein the first compound is a compound having 2 or more of the chain polymerizable functional groups in one molecule.

5. The electrophotographic photoreceptor according to claim 1 , wherein the first compound is a compound represented by the following formula (I):

wherein in the formula (I), Ar 1 to Ar 4 each independently represent a substituted or unsubstituted aryl group; Ar 5 represents a substituted or unsubstituted aryl group, or a substituted or unsubstituted arylene group; D represents a group containing a functional group having a carbon double bond; c1 to c5 independently represent 0, 1, or 2; k represents 0 or 1; and a total number of D's is 1 or more.

6. The electrophotographic photoreceptor according to claim 5 , wherein in the compound represented by formula (I), D represents a group having at least one selected from the group consisting of an acryloyl group, a methacryloyl group, a vinylphenyl group, an allyl group, a vinyl group, a vinyl ether group, an ally vinyl ether group, and derivatives thereof.

7. The electrophotographic photoreceptor according to claim 1 , wherein the functional layer further contains a heat radical generator or a derivative thereof.

8. A process cartridge comprising the electrophotographic photoreceptor of claim 1 , the process cartridge being detachable from an image forming apparatus.

9. The process cartridge according to claim 8 , wherein the functional layer of the electrophotographic photoreceptor is an outermost layer.

10. The process cartridge according to claim 8 , wherein the first compound of the electrophotographic photoreceptor is a compound having 2 or more of the chain polymerizable functional groups in one molecule.

11. The process cartridge according to claim 8 , wherein the first compound of the electrophotographic photoreceptor is a compound represented by the following formula (I):

wherein in the formula (I), Ar 1 to Ar 4 each independently represent a substituted or unsubstituted aryl group; Ar 5 represents a substituted or unsubstituted aryl group, or a substituted or unsubstituted arylene group; D represents a group containing a functional group having a carbon double bond; c1 to c5 independently represent 0, 1, or 2; k represents 0 or 1; and a total number of D's is 1 or more.

12. An image forming apparatus, comprising:

the electrophotographic photoreceptor according to claim 1 ;

a charging unit that charges the electrophotographic photoreceptor;

an electrostatic latent image forming unit that forms an electrostatic latent image on the charged electrophotographic photoreceptor;

a developing unit that develops the electrostatic latent image formed on the electrophotographic photoreceptor by a toner to form a toner image; and

a transfer unit that transfers the toner image to a transfer medium.

13. The image forming apparatus according to claim 12 , wherein the functional layer of the electrophotographic photoreceptor is an outermost layer.

14. The image forming apparatus according to claim 12 , wherein the first compound of the electrophotographic photoreceptor is a compound having 2 or more of the chain polymerizable functional groups in one molecule.

15. The image forming apparatus according to claim 12 , wherein the first compound of the electrophotographic photoreceptor is a compound represented by the following formula (I):

wherein in the formula (I), Ar 1 to Ar 4 each independently represent a substituted or unsubstituted aryl group; Ar 5 represents a substituted or unsubstituted aryl group, or a substituted or unsubstituted arylene group; D represents a group containing a functional group having a carbon double bond; c1 to c5 independently represent 0, 1, or 2; k represents 0 or 1; and a total number of D's is 1 or more.