Electrophotographic photosensitive member, and electrophotographic apparatus, device unit, and facsimile machine employing the same

An electrophotographic apparatus, comprising an electrophotographic photosensitive member, an image forming means for forming an electrostatic latent image, a developing means for developing the formed latent image, and a transferring means for transferring a developed image to a transfer-receiving material,

• said electrophotographic photosensitive member comprising an electroconductive support and a photosensitive layer formed thereon, the photosensitive layer containing oxytitanium phthalocyanine, and a surface layer of the photosensitive member containing a copolymer having a first structural unit represented by the structural formula [I]:
• ##STR54## where A is a linear, branched or cyclic alkylidene group, an aryl-substituted alkylidene group, an arylene-dialkylidene group, or a group of --O--, --S--, --CO--, --SO--, or --SO.sub.2 --, the alkylidene group having 1 to 10 carbon atoms;
• R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are each hydrogen, halogen or an alkyl or alkenyl group having 1 to 4 carbon atoms, and a second structural unit [II]:
• ##STR55## R.sub.5 is an alkylene or alkylidene group having 2 to 6 carbon atoms;
• R.sub.6 and R.sub.7 are each an alkyl group having 1 to 3 carbon atoms, a phenyl group, or a substituted phenyl group;
• n is an integer of from 1 to 200.

A device unit comprising an electrophotographic photosensitive member, a charging means, a developing means, and a cleaning means,

• said electrophotographic photosensitive member comprising an electroconductive support and a photosensitive layer formed thereon, the photosensitive layer containing oxytitanium phthalocyanine, and a surface layer of the photosensitive member containing a copolymer having a first structural unit represented by the structural formula [I]:
• ##STR56## where A is a linear, branched or cyclic alkylidene group, an aryl-substituted alkylidene group, an arylene-dialkylidene group, or a group of --O--, --S--, --CO--, --SO--, or --SO.sub.2 --, the alkylidene group having 1 to 10 carbon atoms;
• R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are each hydrogen, halogen, or an alkyl or alkenyl group having 1 to 4 carbon atoms, and a second structural unit [II]:
• ##STR57## where R.sub.5 is an alkylene or alkylidene group having 2 to 6 carbon atoms;
• R.sub.6 and R.sub.7 are each an alkyl group having 1 to 3 carbon atoms, a phenyl group, or a substituted phenyl group;
• n is an integer of from 1 to 200, and
• said unit holding integrally the electrophotographic photosensitive member and at least one means selected from a charging means, a developing means, and a cleaning means, and being demountable from the main body of an electrophotographic apparatus.

A facsimile machine comprising an electrophotographic apparatus and an information-receiving means for receiving image information from a remote terminal,

• said electrophotographic apparatus comprising an electrophotographic photosensitive member,
• said electrophotographic photosensitive member comprising an electroconductive support and a photosensitive layer formed thereon, the photosensitive layer containing oxytitanium phthalocyanine, and a surface layer of the photosensitive member containing a copolymer having a first structural unit represented by the structural formula [I]:
• ##STR58## where A is a linear, branched or cyclic alkylidene group, an aryl-substituted alkylidene group, an arylene-dialkylidene group, or a group of --O--, --S--, --CO--, --SO--, or --SO.sub.2 --, the alkylidene group having 1 to 10 carbon atoms;
• R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are each hydrogen, halogen, or an alkyl or alkenyl group having 1 to 4 carbon atoms, and a second structural unit [II]:
• ##STR59## where R.sub.5 is an alkylene or alkylidene group having 2 to 6 carbon atoms;
• R.sub.6 and R.sub.7 are each an alkyl group having 1 to 3 carbon atoms, a phenyl group, or a substituted phenyl group;
• n is an integer of from 1 to 200.