The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 21, 2000
Filed:
Oct. 16, 1998
Applicant:
Inventors:
Yasuhiro Yamasaki, Neyagawa, JP;
Kazuyoshi Kuroda, Neyagawa, JP;
Assignee:
Orient Chemical Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09B / ; C09B / ; G03G / ;
U.S. Cl.
CPC ...
540141 ; 540122 ; 540140 ; 430 58 ; 430 78 ;
Abstract
A process for preparing .chi.-form metal free phthalocyanine comprising: dry milling amorphous-like .alpha.-form metal free phthalocyanine to form .chi.-form metal free phthalocyanine partially; and wet milling or dispersing with stirring the resulting polymorph mixture in the presence of a cyclic organic solvent comprising an amide moiety. A simple process for preparing high-pure .chi.-form H2-Pc suitable as a charge generating meterial of an organic photoreceptor is provided, by improving the conventional technique for preparing .chi.-form H2-Pc.