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:
Jun. 20, 1995
Filed:
Nov. 03, 1994
Applicant:
Inventors:
Hideo Teshima, Ichihara, JP;
Masahiko Kuramoto, Ichihara, JP;
Assignee:
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
528490 ; 528497 ; 528498 ;
Abstract
There is disclosed a process for purifying a styrene polymer which comprises subjecting a highly syntiotactic styrene polymer which is produced by the use of a catalyst composition of (A) an aluminoxane or a specific coordination complex compound and (B) a transition metal compound to deashing treatment at the glass transition temperature of the styrene polymer or higher. The process is capable of efficiently deashing the styrene polymer produced by polymerizing a styrene monomer at a high concentration with a high conversion efficiency. Accordingly, the process greatly improves the productivity of highly pure styrene polymer.