(57) Photoreceptor comprising an electroconductive base that has a carrier generation
layer formed thereon which is overlaid with a carrier transport layer. This photoreceptor
is characterized in that said carrier transport layer comprises at least two constituent
layers, that the weight ratio of the content of the carrier transport material to
the binder material in a constituent layer which is closer to said electroconductive
base is higher than the weight ratio of the content of the carrier transport material
to the binder material in a constituent layer which is more remote from said electroconductive
base, and that the binder in the outermost constituent layer of said carrier transport
layer contains a polycarbonate having as the principal recurring unit a structural
unit represented by the following general formula (I) and/or a structural unit represented
by the following general formula (II):
(where R¹ and R² each is a hydrogen atom, a substituted or unsubstituted aliphatic
group, a substituted or unsubstituted carbocyclic group, or a substituted or unsubstituted
aromatic group, provided that at least one of R¹ and R² is a "bulky" group; and R³,
R⁴, R⁵, R⁶, R⁷, R⁸, R⁹ and R¹⁰ each is a hydrogen atom, a halogen atom, a substituted
or unsubstituted aliphatic group, or a substituted or unsubstituted carbocyclic group);
where R³, R⁴ R⁵, R⁶, R⁷, R⁸, R⁹ and R¹⁰ each is same as defined above; Z is the atomic
group necessary to form a substituted or unsubstituted carbon ring or a substituted
or unsubstituted heterocyclic ring).
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