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. 02, 1977
Filed:
Apr. 21, 1975
Sumitomo Chemical Company, Limited, Osaka, JA;
Abstract
A petroleum resin produced by copolymerizing a monomer composition comprising (1) a mixture of 20 to 80 parts by weight of a so-called spent C.sub.4 - or C.sub.5 -fraction obtained by removing most of the dienic constituents from a fraction mainly of four or five carbon atoms formed in petroleum cracking and 80 to 20 parts by weight of styrene and/or a styrene derivative, and (2) 0.5 to 10 parts by weight of divinylbenzene for 100 parts by weight of the monomeric constituents contained in said mixture (1), with a catalyst system comprising an organoaluminum compound represented by the general formula AlR.sub.n X.sub.3.sub.-n (wherein R is an alkyl group having 1 to 4 carbon atoms, X is a halogen atom, and n is a positive number from 1 to 2) as main catalyst and an alkyl halide or a hydrogen halide as co-catalyst in a hydrocarbon solvent at a temperature of 0.degree. to 60.degree. C.