Electrophotographic photoreceptor, process cartridge, and image forming apparatus
An electrophotographic photoreceptor includes a conductive substrate, an undercoating layer, and a photosensitive layer. The undercoating layer that is provided on the conductive substrate and includes a binder resin and a charge transporting material. The binder resin includes a resin obtained by polymerizing a diallyl phthalate compound. The photosensitive layer that is provided on the undercoating layer.
1. An electrophotographic photoreceptor comprising:
a conductive substrate;
an undercoating layer that is provided on the conductive substrate and contains a binder resin and a charge transporting material, the binder resin containing a resin obtained by polymerizing a diallyl isophthalate compound alone, or a diallyl phthalate compound and a (meth)acrylic monomer; and
a photosensitive layer that is provided on the undercoating layer.
2. The electrophotographic photoreceptor according to claim 1 ,
wherein the diallyl isophthalate compound includes a monomer and a prepolymer of the diallyl isophthalate compound.
3. The electrophotographic photoreceptor according to claim 2 ,
wherein a weight ratio of the monomer to the prepolymer is from 1/99 to 99/1.
4. The electrophotographic photoreceptor according to claim 3 , wherein the weight ratio of the monomer to the prepolymer is from 20/80 to 80/20.
5. The electrophotographic photoreceptor according to claim 2 , wherein a weight average molecular weight of the prepolymer is 200,000 or less.
6. The electrophotographic photoreceptor according to claim 1 ,
wherein the charge transporting material includes at least one kind of perinone compounds represented by Formula (1) or (2):
in Formula (1), R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 , and R 18 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aralkyl group, an aryl group, an aryloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkoxycarbonylalkyl group, an aryloxycarbonylalkyl group, or a halogen atom, R 11 and R 12 may be linked to each other to form a ring, R 12 and R 13 may be linked to each other to form a ring, R 13 and R 14 may be linked to each other to form a ring, R 15 and R 16 may be linked to each other to form a ring, R 16 and R 17 may be linked to each other to form a ring, and R 17 and R 18 may be linked to each other to form a ring; and
in Formula (2), R 21 , R 22 , R 23 , R 24 , R 25 , R 26 , R 27 , R 28 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aralkyl group, an aryl group, an aryloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkoxycarbonylalkyl group, an aryloxycarbonylalkyl group, or a halogen atom, R 21 and R 22 may be linked to each other to form a ring, R 22 and R 23 may be linked to each other to form a ring, R 23 and R 24 may be linked to each other to form a ring, R 25 and R 26 may be linked to each other to form a ring, R 26 and R 27 may be linked to each other to form a ring, and R 27 and R 28 may be linked to each other to form a ring.
7. The electrophotographic photoreceptor according to claim 6 ,
wherein, in Formula (1), R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 , and R 18 each independently represent a hydrogen atom, an alkyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkoxycarbonylalkyl group or an aryloxycarbonylalkyl group, and in Formula (2), R 21 , R 22 , R 23 , R 24 , R 25 , R 26 , R 27 , R 28 each independently represent a hydrogen atom, an alkyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkoxycarbonylalkyl group, or an aryloxycarbonylalkyl group.
8. The electrophotographic photoreceptor according to claim 6 , wherein the perinone compound represented by Formulas (1) and (2) constitutes from 90% by weight to 100% by weight of the charge transporting material.
9. The electrophotographic photoreceptor according to claim 1 , wherein a content of the diallyl phthalate compound is from 50 part by weight to 99.5 parts by weight with respect to 100 parts by weight of a total solid content of the binder resin.
10. The electrophotographic photoreceptor according to claim 1 ,
wherein a content of the charge transporting material with respect to a total solid content of the undercoating layer is from 40% by weight to 80% by weight.
11. The electrophotographic photoreceptor according to claim 1 , wherein a content of the resin obtained by polymerizing the diallyl isophthalate compound alone, or a diallyl phthalate compound and a (meth)acrylic monomer is 90% by weight or more with respect to a total amount of the binder resin.
12. The electrophotographic photoreceptor according to claim 1 , wherein the undercoating layer further comprises metal oxide particles selected from the group consisting of zinc oxide, titanium oxide, tin oxide, aluminum oxide, indium oxide, silicon oxide, magnesium oxide, barium oxide, molybdenum oxide, or a combination thereof.
13. A process cartridge that is detachable from 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 a charged surface of the electrophotographic photoreceptor;
a developing unit that develops the electrostatic latent image formed on the surface of the electrophotographic photoreceptor with a developer including toner to form a toner image; and
a transfer unit that transfers the toner image onto a surface of a recording medium.