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Phthalocyanine pigment and dispersion thereof and electrophotographic photoreceptor containing the pigment
| Details |
Inventors: Nukada, Hidemi; Suzuki, Takahiro; Nukada, Katsumi; Daimon, Katsumi; Sakaguchi, Yasuo;
Assignee: Fuji Xerox Co., Ltd (Tokyo, JP)
Primary Examiner: Dote; Janis L.
Assistant Examiner:
Attorney, Agent or Firm: Oliff & Berridge
An electrophotographic photoreceptor comprising a conductive substrate having thereon a photosensitive layer, the photosensitive layer containing a hydroxymetal or hydroxysilicon phthalocyanine pigment represented by formula (I) as a charge generating material, the phthalocyanine pigment having been treated with an organometallic compound having a hydrolyzable functional group or a hydrolysis product thereof: ##STR1## wherein Me represents Al, Ga, In, Si, Ge or Sn; X represents H, Cl, Br or I; m represents an integer of from 1 to 4; and n represents 1 where Me is Al, Ga or In, or 2 where Me is Si, Ge or Sn. |
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DETAILED DESCRIPTION An object of the present invention is to provide a hydroxymetal or hydroxysilicon phthalocyanine pigment having improved dispersibility.
Another object of the present invention is to provide a dispersion of a hydroxymetal or hydroxysilicon phthalocyanine pigment having improved coating properties and improved preservability.
A further object of the present invention is to provide an electrophotographic photoreceptor excellent in sensitivity characteristics, charge retention properties, and image characteristics.
Other objects and effects of the present invention will be apparent from the following description.
The present inventors have noted that a hydroxymetal or hydroxysilicon phthalocyanine has poor dispersion stability in organic solvents because of their hydrophilic hydroxyl group, and they have conducted extensive studies on treatment of a hydroxymetal or hydroxysilicon phthalocyanine for rendering hydrophobic and thereby compatible with an organic solvent.
As a result, it has now been found that an organometallic compound having a hydrolyzable functional group or a hydrolysis product thereof serves as a surface treating agent and/or a dispersion stabilizer for a hydroxymetal or hydroxysilicon phthalocyanine pigment, and provides a hydroxymetal or hydroxysilicon phthalocyanine pigment and its dispersion excellent in dispersibility, coating properties, and preservability, thereby making it feasible to produce a hydroxymetal or hydroxysilicon phthalocyanine-containing electrophotographic photoreceptor excellent in sensitivity characteristics, charge retention properties, and image characteristics.
The present invention has been completed based on this finding.
The present invention relates to an electrophotographic photoreceptor comprising a conductive substrate having thereon a photosensitive layer, the photosensitive layer containing a hydroxymetal or hydroxysilicon phthalocyanine pigment represented by formula (I) as a charge generating material, the phthalocyanine pigment having being treated with an organometallic compound having a hydrolyzable functional group or a hydrolysis product thereof: ##STR2## wherein Me represents Al, Ga, In, Si, Ge or Sn, with Ga being preferred; X represents H, Cl, Br or I; m represents an integer of from 1 to 4; and n represents 1 where Me is Al, Ga or In, or 2 where Me is Si, Ge or Sn
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Molecular Biology 
