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:
Aug. 07, 1990
Filed:
Dec. 22, 1988
Hisatake Sato, Yokohama, JP;
Masaharu Makino, Yokohama, JP;
Nippon Oil Company Ltd., , JP;
Abstract
A method for preparing a light-colored indene-coumarone resin is here disclosed which comprises the step of polymerizing an aromatic coal fraction raw material having a boiling point of 140.degree. to 240.degree. C. in the presence of a Friedel-Crafts type catalyst in a polymerization reactor in which the amount of oxygen is restricted to 15 ml or less with respect to 100 g of the aromatic coal fraction raw material oil at room temperature. As a raw material, a mixture is also used which is composed of the above-mentioned aromatic coal fraction and a phenol in an amount of 3 to 30 parts by weight with respect to 100 parts by weight of the aromatic coal fraction.