Electrophotographic photoreceptor, and image forming apparatus and process cartridge therefor using the photoreceptor
An electrophotographic photoreceptor, including a charge generation layer and a charge transport layer on an electroconductive substrate, wherein the charge generation layer includes titanylphthalocyanine and a binder resin which is a crosslinked material of a resin comprising a polyvinylbutyrat site having the following formula (1) and an isocyanate compound having the following formula (2): wherein R1 and R2 independently represent an alkyl group having 1 to 3 carbon atoms; k, l, m and n represent composition ratios and k+1 is from 0.60 to 0.80, wherein k or 1 may be 0, m is from 0.02 to 0.03, and n is from 0.20 to 0.40; wherein A represents a substituted or unsubstituted organic group having 2 to 4 valences; and O represents an integer of from 2 to 4.
1. An electrophotographic photoreceptor, comprising a charge generation layer over an electroconductive substrate, and a charge transport layer on the charge generation layer,
wherein the charge generation layer comprises titanylphthalocyanine and a binder resin which is a crosslinked material of a resin comprising a polyvinylbutyral site having the following formula (1) and an isocyanate compound having the following formula (4):
wherein R1 and R2 independently represent an alkyl group having 1 to 3 carbon atoms; k, l, m and n represent composition ratios and k+1 is from 0.60 to 0.80, wherein k or 1 may be 0, m is from 0.02 to 0.03, and n is from 0.20 to 0.40;
wherein A 3 represents a substituted or an unsubstituted non-aromatic hydrocarbon group or an aryl group; Ar 1 represents a substituted or an unsubstituted aromatic ring; R 3 and R 4 independently represent a divalent organic group having 1 to 3 carbon atoms when A 3 is a non-aromatic hydrocarbon group and a single bond when A 3 is an aryl group; and q represents an integer of from 2 to 4.
2. The electrophotographic photoreceptor of claim 1 , wherein n in the formula (1) is from 0.30 to 0.40.
3. The electrophotographic photoreceptor of claim 1 , further comprising:
an undercoat layer positioned between the electroconductive substrate and the charge generation layer.
4. An image forming apparatus, comprising:
the electrophotographic photoreceptor according to claim 1 ;
a charger configured to charge the electrophotographic photoreceptor;
an irradiator configured to irradiate the electrophotographic photoreceptor to form an electrostatic latent image thereon;
an image developer configured to develop the electrostatic latent image with a developer comprising a toner to form a toner image on the electrophotographic photoreceptor; and
a transferer configured to transfer the toner image onto a transfer material.
5. The image forming apparatus of claim 4 , wherein the electrophotographic photoreceptor and at least one of the charger. the irradiator, the transferer and a cleaner are unified as a process cartridge.
6. A process cartridge for image forming apparatus, comprising:
electrophotographic photoreceptor according to claim 1 ; and at least one of
a charger configured to charge the electrophotographic photoreceptor;
an irradiator configured to irradiate the electrophotographic photoreceptor to form an electrostatic latent image thereon;
an image developer configured to develop the electrostatic latent image with a developer comprising a toner to form a toner image on the electrophotographic photoreceptor; and
a cleaner configured to clean the toner remaining on the electrophotographic photoreceptor after the toner image is transferred therefrom.