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. 14, 1994
Filed:
Oct. 21, 1992
Masahiko Kuramoto, Ichihara, JP;
Hideo Teshima, Ichihara, JP;
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Abstract
There is disclosed a process for purification of a styrene polymer, for purifying a styrene polymer having a high degree of syndiotacticity obtained by using a catalyst comprising (A) aluminoxane and (B) a transition metal compound containing no halogen, deashing the above styrene polymer with an alcoholic alkaline solution and then washing with an alcohol. Also disclosed is a process for purification of a styrene polymer which comprises deashing the above styrene polymer having been produced with a conversion rate of 60% or more after swelling it by adding an aromatic solvent and/or a styrene monomer. According to the process of the present invention, a high purity styrene polymer can be obtained with good efficiency.