Positively-charged electrophotographic organophotoreceptor, and cartridge, drum and image forming apparatus having same

A method of manufacturing a positively-charged electrophotographic organophotoreceptor, comprising:

• forming a charge transport layer on a conductive support;
• dissolving a binder in an organic solvent selected from the group consisting of an alcoholic solvent, an acetate solvent, and a mixture of the alcoholic and acetate solvents, followed by the addition of a charge generating material, milling, dilution of the milled product with an alcoholic solvent, an acetate solvent, or a mixture of the alcoholic and acetate solvents, and mixing, to form a charge generating layer composition;
• and
• coating the charge generating layer composition on the charge transport layer and drying the charge generating layer composition to form a charge generating layer.

An organophotoreceptor cartridge of an image forming apparatus, having a positively-charged electrophotographic organophotoreceptor installed therein, the organophotoreceptor cartridge comprising:

• a positively-charged electrophotographic organophotoreceptor;
• and
• at least one of a charging device that charges the positively-charged electrophotographic organophotoreceptor, a developing device which develops an electrostatic latent image formed on the positively-charged electrophotographic organophotoreceptor, and a cleaning device which cleans a surface of the positively-charged electrophotographic organophotoreceptor,
• wherein the organophotoreceptor cartridge is capable of being attached to and detached from the image forming apparatus, and
• wherein the positively-charged electrophotographic organophotoreceptor comprises:
• a conductive support;
• a charge transport layer formed on the conductive support;
• and
• a charge generating layer formed by coating a charge generating layer composition on the charge transport layer and drying the coated charge generating layer composition, wherein the charge generating layer composition comprises:
• a charge generating material;
• a binder;
• and
• an organic solvent containing an alcoholic solvent and an acetate solvent in a ratio from 1:9 to 5:5 by weight.

An organophotoreceptor drum for an image forming apparatus, comprising:

• a drum having a positively-charged electrophotographic organophotoreceptor installed thereon, wherein the positively-charged electrophotographic organophotoreceptor comprises:
• a conductive support coated on the drum;
• a charge transport layer formed on the conductive support;
• and
• a charge generating layer formed by coating a charge generating layer composition on the charge transport layer and drying the coated charge generating layer composition,
• wherein the drum is attachable to and detachable from the image forming apparatus, and
• wherein the charge generating layer composition comprises:
• a charge generating material;
• a binder;
• and
• an organic solvent containing an alcoholic solvent and an acetate solvent in a ratio from 1:9 to 5:5 by weight.

An image forming apparatus comprising:

• a photoreceptor unit;
• a charging device which charges the photoreceptor;
• an imagewise light irradiating device which irradiates the charged photoreceptor unit with imagewise light to form an electrostatic latent image on the photoreceptor unit;
• a developing device which develops the electrostatic latent image with a toner to form a toner image on the photoreceptor unit;
• and
• a transfer device which transfers the toner image onto a receiving material,
• wherein the photoreceptor unit comprises a positively-charged electrophotographic organophotoreceptor comprising:
• a conductive support;
• a charge transport layer formed on the conductive support;
• and
• a charge generating layer formed by coating a charge generating layer composition on the charge transport layer and drying the coated charge generating layer composition, wherein the charge generating layer composition comprises:
• a charge generating material;
• a binder;
• and
• an organic solvent containing an alcoholic solvent and an acetate solvent in a ratio from 1:9 to 5:5 by weight.