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:
Jan. 22, 1991
Filed:
Jan. 04, 1990
Kureha Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
Disclosed herein is a process for producing a substantially quinoline-soluble and optically anisotropic pitch for carbon materials, which process comprises the steps of (1) polymerizing naphthalene by heating at a temperature of not higher than 330.degree. C. for 0.5 to 100 hours in the presence of Lewis acid catalyst, (2) removing said catalyst from the reaction mixture, (3) subjecting said reaction mixture to thermal treatment at a temperature of 390.degree. to 450.degree. C. for 1 to 5 hours under a pressure of not less than an atmospheric pressure so as to produce neither a quinoline-insoluble pitch nor optically anisotropic pitch, thereby carrying out aromatization of the polymerizate of naphthalene, and (4) heating the thus treated material at a temperature of 350.degree. to 380.degree. C. for 3 to 10 hours under a reduced pressure while flowing an inert gas, thereby removing the volatile components for said material, and the pitch produced by the process.