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:
May. 03, 1983
Filed:
Oct. 30, 1981
Kosaku Noguchi, Tokyo, JP;
Honami Tanaka, Izumi, JP;
Yukimasa Kumura, Izumi, JP;
Eiji Kitajima, Izumi, JP;
Noriyuki Tsuchiya, Izumi, JP;
Tomonori Sunada, Ootsu, JP;
Koa Oil Company, Limited, Tokyo, JP;
Abstract
Mesocarbon microbeads of narrow particle-size distribution are produced by: subjecting a heavy oil to a primary heat treatment at a temperature T.sub.1 to prepare a pitch containing mesophase microspheres; once cooling this pitch to a temperature lower than its softening point; thereafter subjecting the pitch to a secondary heat treatment at a temperature T.sub.2, which is higher than 350.degree. C. and lower than (T.sub.1 -40.degree. C.); cooling the pitch at a cool rate lower than 200.degree. C./hour; separating from the pitch mesophase microspheres which precipitated in the secondary heat-treatment step; and thereafter obtaining by solvent extraction mesophase microspheres of substantially uniform particle size formed in the residual pitch. The mesocarbon beads of narrow particle-size distribution thus obtained are particularly suitable for use as chromatograph packing material, catalyst support, and other uses.