| US 7,507,509 B2 | ||
| Electrophotographic photoreceptor, and image forming method, image forming apparatus and process cartridge using the electrophotographic photoreceptor | ||
| Kazukiyo Nagai, Numazu (Japan); Tetsuro Suzuki, Fuji (Japan); Hiroshi Tamura, Susono (Japan); and Hongguo Li, Numazu (Japan) | ||
| Assigned to Ricoh Company, Ltd., Tokyo (Japan) | ||
| Filed on Oct. 07, 2005, as Appl. No. 11/245,135. | ||
| Claims priority of application No. 2004-295214 (JP), filed on Oct. 07, 2004. | ||
| Prior Publication US 2006/0078809 A1, Apr. 13, 2006 | ||
| Int. Cl. G03G 5/047 (2006.01) | ||
| U.S. Cl. 430—58.7 [430/59.6; 430/96] | 17 Claims |
| 1. An electrophotographic photoreceptor, comprising a crosslinked material comprising units obtained from:
a radical polymerizing monomer A having three or more radical polymerizing groups in an amount of 20-80%;
a compound B having the following formula (1):
B1—Ar1—CH═CH—Ar2—B2 (1)
wherein Ar1 represents a substituted or an unsubstituted monovalent group or bivalent group formed of an aromatic hydrocarbon skeleton;
Ar2 represents a monovalent group or a bivalent group formed of an aromatic hydrocarbon skeleton or heterocyclic compound skeleton
having one or more tertiary amino groups; and wherein at least one of B1 and B2 is a hydrogen atom, and the other when not hydrogen is an acryloyloxy group; a methacryloyloxy group; a vinyl group; an alkyl
group having an acryloyloxy group, a methacryloyloxy group or a vinyl group; or an alkoxy group having an acryloyloxy group,
a methacryloyloxy group or a vinyl group; and
optionally a photo polymerization initiator.
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