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:
Feb. 27, 1996
Filed:
Oct. 28, 1994
Toshio Tamaki, Kamisumachi, JP;
Petoca Ltd., Tokyoto, JP;
Abstract
A process for producing an optically isotropic reformed pitch useful for various carbon materials is provided. This process comprises mixing a pitch having a ratio of aromatic hydrocarbon fa of more than 0.6 with a strong Lewis acid and a co-solvent so as to give a mol ratio of the said Lewis acid to the said pitch in the range of 0.3.about.5.0 and a mol ratio of the said co-solvent to the said pitch in the range of ratio of 2.5.about.50, reacting the mixture at a temperature of 100.degree..about.300.degree. C. and removing the Lewis acid and the co-solvent from the reaction product. Meso-Carbon microbeads having a uniform diameter of 20 .mu.m or less can be produced at a high yield of 60% or more by heat treating the said reformed pitch at 200.degree..about.380.degree. C. to produce the optically anisotropic small spheres and separating them from an optically isotropic matrix.