Photosensitive materials for electrophotography having a double-

Details Photosensitive materials for electrophotography having a double- Photosensitive materials for electrophotography having a double-

1991-07-26

1994-05-17

McCamish, Marion E.

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Radiation-sensitive composition or product

430 57, 430 78, G03G 1502

Patent

active

053127056

ABSTRACT:
A photosensitive material for electrophotography which comprises a conductive support, and a charge transport layer and a charge generation layer formed on the conductive support, is described. The charge generation layer is formed from a dispersion which is obtained by mixing X-type and/or .tau.-type metal-free phthalocyanine, with or without at least one other charge generation agent, and a resin binder in a solvent, which is capable of dissolving at least a part of X-type and/or .tau.-type metal-free phthalocyanine, to such an extent that a ratio between X-ray diffraction peak intensities at about 7.5.degree. and at about 9.1.degree. is in the range of 1:1 to 0.1:1. When the at least one other charge generation agent is used in combination, the charge generation layer is formed on the conductive support on which the charge transport layer is formed. If such other agent is not used, the charge generation layer is formed on the charge transport layer with a certain thickness. The photosensitive materials have good photosensitivity, image characteristics and printing resistance.

REFERENCES:
patent: 3357989 (1967-12-01), Byrne et al.
patent: 4507374 (1985-03-01), Kakuta et al.
patent: 4755443 (1988-07-01), Suzuki et al.
patent: 4865934 (1989-09-01), Ueda et al.
patent: 5087540 (1992-02-01), Murakami et al.
"Patent Abstracts of Japan" vol. 12, No. 401 (P-776)(3248) Oct. 25, 1988 & JP-A-63 142 356 (Seiko Epson Corp) Jun. 14, 1988 *abstract*.

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