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:
Sep. 19, 1995
Filed:
Dec. 27, 1994
Satoshi Ikeuchi, Ichihara, JP;
Norio Tomotsu, Ichihara, JP;
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Abstract
There is disclosed a process for producing a styrenic polymer having a syndiotactic configuration which comprises polymerizing a styrenic monomer containing hydrogen dissolved therein at a hydrogen partial pressure of at most 1 kg/cm.sup.2 G by the use of a polymerization catalyst comprising an (a) transition metal compound and a (b) coordination complex compound composed of a cation and an anion in which a plurality of radicals are bonded to a metal, or an aluminoxane and, when necessary, a (c) alkylating agent. The above process is capable of modifying the molecular weight of the objective SPS, lowering its molecular weight without expanding the molecular weight distribution, and decreasing the required quantity of the catalyst and the residual quantities of metals in the resultant SPS, whereby the production cost of the objective SPS is considerably curtailed.