| US 7,588,871 B2 | ||
| Electrophotographic photoreceptor and image forming apparatus provided with the same | ||
| Akiko Kihara, Nara (Japan); Kotaro Fukushima, Kawanishi (Japan); and Takatsugu Obata, Nara (Japan) | ||
| Assigned to Sharp Kabushiki Kaisha, Osaka (Japan) | ||
| Appl. No. 10/575,097 PCT Filed Oct. 08, 2004, PCT No. PCT/JP2004/014967 § 371(c)(1), (2), (4) Date Apr. 10, 2006, PCT Pub. No. WO2005/036275, PCT Pub. Date Apr. 21, 2005. |
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| Claims priority of application No. 2003-349644 (JP), filed on Oct. 08, 2003. | ||
| Prior Publication US 2007/0077506 A1, Apr. 05, 2007 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G03G 5/06 (2006.01) | ||
| U.S. Cl. 430—58.85 [430/56; 430/72; 430/73; 430/59.6] | 7 Claims |
| 1. An electrophotographic photoreceptor comprising:
a conductive substrate; and
a photosensitive layer disposed on the conductive substrate, containing a charge generating substance and a charge transporting
substance,
wherein the charge transporting substance contains an enamine compound represented by the following general formula (1), and
in a case where a maximum indentation load of 30 mN is put on a surface for 5 seconds under circumstances of temperature of
25° C. and relative humidity of 50%, a creep value (CIT) is 2.70% or more and 5.00% or less and a plastic deformation hardness value (Hplast) of the surface is 220 N/mm2 or more and 275 N/mm2 or less,
 wherein Ar1 represents an aryl group which may have a substituent or a heterocyclic group which may have a substituent; Ar2 represents an aryl group which may have a substituent or a heterocyclic group which may have a substituent; Ar3 represents an aryl group which may have a substituent, a heterocyclic group which may have a substituent, an aralkyl group
which may have a substituent, or an alkyl group which may have a substituent; Ar4 and Ar5 each represent a hydrogen atom, an aryl group which may have a substituent, a heterocyclic group which may have a substituent,
an aralkyl group which may have a substituent, or an alkyl group which may have a substituent, but it is excluded that Ar4 and Ar5 are hydrogen atoms at the same time; Ar4 and Ar5 may bond to each other via an atom or an atomic group to form a cyclic structure; “a” represents an alkyl group which may
have ha substituent, an alkoxy group which may have a substituent, a dialkylamino group which may have a substituent, an aryl
group which may have a substituent, a halogen atom, or a hydrogen atom; m indicates an integer of from 1 to 6; when m is 2
or more, then the “a”s may be the same or different and may bond to each other to form a cyclic structure; R1 represents a hydrogen atom, a halogen atom, or an alkyl group which may have a substituent; R2, R3 and R4 each represent a hydrogen atom, an alkyl group which may have a substituent, an aryl group which may have a substituent, a
heterocyclic group which may have a substituent, or an aralkyl group which may have a substituent; n indicates an integer
of from 0 to 3; when n is 2 or 3, then the R2s may be the same or different and the R3s may be the same or different, but when n is 0, Ar3 is a heterocyclic group which may have a substituent.
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