Charge transport substance, electrophotographic photoreceptor, electrophotographic photoreceptor cartridge, and image-forming apparatus
View Patent ↗The present invention is to provide a charge transport substance having high resistance to stress within electrophotographic processes, an electrophotographic photoreceptor which has excellent high-speed responsiveness, shows a sufficient residual potential, and has high resistance to stress within electrophotographic processes, an electrophotographic cartridge, and an image-forming apparatus. The invention provides a charge transport substance having a specific structure. The invention further provides an electrophotographic photoreceptor including a photosensitive layer which contains the charge transport substance having a specific structure, an electrophotographic cartridge, and an image-forming apparatus, equipped with this electrophotographic photoreceptor.
1. An electrophotographic photoreceptor comprising:
a conductive support; and
at least a photosensitive layer formed over the support, wherein the photosensitive layer comprises:
a positional-isomer mixture consisting of isomers each represented by formula (2); and
oxytitanium phthalocyanine having a crystal form which, when examined by X-ray powder diffractometry using a CuKα characteristic X-ray line, gives a spectrum which shows diffraction peaks at Bragg angles (2θ±0.2°) of at least 24.1° and 27.2:
wherein R 9 and R 10 each independently represent an alkyl group, and R 11 to R 17 each independently represent a hydrogen atom, an alkyl group, an aryl group, or an alkoxy group, and n 2 represents an integer of 2-5, and 1 and m each independently represent an integer of 1-5, and
wherein the isomers are two or more positional isomers selected from the group consisting of:
an isomer in which a substitution position of —OR 9 is the ortho position and a substitution position of —OR 10 is the ortho position, with respect to the styryl group in formula (2);
an isomer in which a substitution position of —OR 9 is the ortho position and a substitution position of —OR 10 is the para position, with respect to the styryl group in formula (2); and
an isomer in which a substitution position of —OR 9 is the para position and a substitution position of —OR 10 is the para position, with respect to the styryl group in formula (2).
2. An electrophotographic photoreceptor cartridge comprising:
the electrophotographic photoreceptor according to claim 1 ; and
at least one device selected from the group consisting of a charging device which charges the electrophotographic photoreceptor, an exposure device which exposes the charged electrophotographic photoreceptor to light to form an electrostatic latent image, and a developing device which develops the electrostatic latent image formed on the electrophotographic photoreceptor.
3. An image-forming apparatus comprising:
the electrophotographic photoreceptor according to claim 1 ;
a charging device which charges the electrophotographic photoreceptor;
an exposure device which exposes the charged electrophotographic photoreceptor to light to form an electrostatic latent image; and
a developing device which develops the electrostatic latent image formed on the electrophotographic photoreceptor.
4. A charge transport substance represented by formula CT1-8:
5. An electrophotographic photoreceptor, comprising:
a conductive support; and
at least a photosensitive layer formed over the support, wherein the photosensitive layer comprises a charge transport substance is-represented by formula CT1-8:
6. The electrophotographic photoreceptor according to claim 1 , wherein in the formula (2), R 9 and R 10 each independently represent an alkyl group having 1-2 carbon atoms.
7. The electrophotographic photoreceptor according to claim 1 , wherein in the formula (2), R 11 to R 13 each independently represent a hydrogen atom.
8. The electrophotographic photoreceptor according to claim 1 , wherein in the formula (2), R 14 and R 15 each independently represent an alkyl group having 1-2 carbon atoms.
9. The electrophotographic photoreceptor according to claim 1 , wherein in the formula (2), R 16 and R 17 each independently represent a hydrogen atom.
10. The electrophotographic photoreceptor according to claim 1 , wherein in the formula (2), n 2 is 2.
11. The electrophotographic photoreceptor according to claim 1 , wherein the positional-isomer mixture consists of:
the isomer in which the substitution position of —OR 9 is the ortho position and the substitution position of —OR 10 is the ortho position, with respect to the styryl group in formula (2);
the isomer in which the substitution position of —OR 9 is the ortho position and the substitution position of —OR 10 is the para position, with respect to the styryl group in formula (2); and
the isomer in which the substitution position of —OR 9 is the para position and the substitution position of —OR 10 is the para position, with respect to the styryl group in formula (2).