Electrophotographic photoreceptor, method of manufacturing the photoreceptor, and electrophotographic image forming method and apparatus using the photoreceptor
First Claim
1. A photoreceptor comprising:
- an electroconductive substrate;
a charge generation layer overlying the electroconductive substrate and comprising as a charge generation material a titanyl phthalocyanine crystal having an X-ray diffraction spectrum such that a maximum diffraction peak is observed at a Bragg (2θ
) angle of 27.2°
±
0.2°
when a specific X-ray of Cu-Kα
having wavelength of 1.514 Å
irradiates the titanyl phthalocyanine crystal; and
a charge transport layer on the charge generation layer and comprising a binder resin, a charge transport material, water and tetrahydrofuran, wherein a weight ratio of the water to the tetrahydrofuran in the charge transport layer is from 1/50 to 1/0.5.
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Abstract
A photoreceptor including an electroconductive substrate; a charge generation layer formed overlying the electroconductive substrate and including as a charge generation material a titanyl phthalocyanine crystal having an X-ray diffraction spectrum such that a maximum diffraction peak is observed at a Bragg (2θ) angle of 27.2°±0.2° when a specific X-ray of Cu-Kα having wavelength of 1.514 Å irradiates the titanyl phthalocyanine crystal; and a charge transport layer formed on the charge generation layer and including a binder resin, a charge transport material, water and tetrahydrofuran, wherein a weight ratio of the water to the tetrahydrofuran in the charge transport layer is from 1/50 to 1/0.5.
11 Citations
23 Claims
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1. A photoreceptor comprising:
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an electroconductive substrate;
a charge generation layer overlying the electroconductive substrate and comprising as a charge generation material a titanyl phthalocyanine crystal having an X-ray diffraction spectrum such that a maximum diffraction peak is observed at a Bragg (2θ
) angle of 27.2°
±
0.2°
when a specific X-ray of Cu-Kα
having wavelength of 1.514 Å
irradiates the titanyl phthalocyanine crystal; and
a charge transport layer on the charge generation layer and comprising a binder resin, a charge transport material, water and tetrahydrofuran, wherein a weight ratio of the water to the tetrahydrofuran in the charge transport layer is from 1/50 to 1/0.5. - View Dependent Claims (2, 3, 4, 5)
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6. A method for manufacturing a photoreceptor comprising:
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forming a charge generation layer overlying an electroconductive substrate, wherein the charge generation layer comprises a titanyl phthalocyanine crystal having an X-ray diffraction spectrum such that a maximum diffraction peak is observed at a Bragg (2θ
) angle of 27.2°
±
0.2°
when a specific X-ray of Cu-Kα
having wavelength of 1.514 Å
irradiates the titanyl phthalocyanine crystal; and
forming a charge transport layer on the charge generation layer by coating the charge generation layer with a charge transport layer coating liquid comprising a charge transport material, a binder resin, tetrahydrofuran and water, wherein a weight ratio of the water to the tetrahydrofuran in the charge transport layer is from 1/50 to 1/0.5. - View Dependent Claims (7, 8)
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9. An image forming method comprising:
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charging a photoreceptor;
irradiating the photoreceptor with light to form an electrostatic latent image on the photoreceptor;
developing the electrostatic latent image with a developer comprising a toner to form a toner image on the photoreceptor;
transferring the toner image on a receiving material;
cleaning a surface of the photoreceptor; and
discharging a remaining charge on the photoreceptor, wherein the photoreceptor comprises;
an electroconductive substrate;
a charge generation layer overlying the electroconductive substrate and comprising as a charge generation material a titanyl phthalocyanine crystal having an X-ray diffraction spectrum such that a maximum diffraction peak is observed at a Bragg (2θ
) angle of 27.2°
±
0.2°
when a specific X-ray of Cu-Kα
having wavelength of 1.514 Å
irradiates the titanyl phthalocyanine crystal; and
a charge transport layer on the charge generation layer and comprising a binder resin, a charge transport material, water and tetrahydrofuran;
wherein a weight ratio of the water to the tetrahydrofuran in the charge transport layer is from 1/50 to 1/0.5. - View Dependent Claims (10, 11, 12, 13, 15, 16, 17, 18, 20, 21, 22, 23)
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14. An image forming apparatus comprising:
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a photoreceptor;
a charger configured to charge the photoreceptor;
a light irradiator configured to irradiate the photoreceptor with light to form an electrostatic latent image on the photoreceptor;
an image developer configured to develop the electrostatic latent image with a developer comprising a toner to form a toner image on the photoreceptor;
an image transfer configured to transfer the toner image on a receiving material;
a cleaner configured to clean the surface of the photoreceptor; and
a discharger configured to discharge a remaining charge on the photoreceptor;
wherein the photoreceptor comprises;
an electroconductive substrate;
a charge generation layer overlying the electroconductive substrate and comprising as a charge generation material a titanyl phthalocyanine crystal having an X-ray diffraction spectrum such that a maximum diffraction peak is observed at a Bragg (2θ
) angle of 27.2°
±
0.2°
when a specific X-ray of Cu-Kα
having wavelength of 1.514 Å
irradiates the titanyl phthalocyanine crystal; and
a charge transport layer on the charge generation layer and comprising a binder resin, a charge transport material, water and tetrahydrofuran;
wherein a weight ratio of the water to the tetrahydrofuran in the charge transport layer is from 1/50 to 1/0.5.
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19. A process cartridge for an electrophotographic image forming apparatus, comprising:
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a housing; and
a photoreceptor, wherein the photoreceptor comprises;
an electroconductive substrate;
a charge generation layer overlying the electroconductive substrate and comprising as a charge generation material a titanyl phthalocyanine crystal having an X-ray diffraction spectrum such that a maximum diffraction peak is observed at a Bragg (2θ
) angle of 27.2°
±
0.2°
when a specific X-ray of Cu-Kα
having wavelength of 1.514 Å
irradiates the titanyl phthalocyanine crystal; and
a charge transport layer on the charge generation layer and comprising a binder resin, a charge transport material, water and tetrahydrofuran;
wherein a weight ratio of the water to the tetrahydrofuran in the charge transport layer is from 1/50 to 1/0.5.
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Specification