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:
Jan. 23, 1979
Filed:
Mar. 14, 1977
Atsushi Kaiya, Kawasaki, JP;
Eizo Arai, Yokohama, JP;
Hideo Kawaguchi, Kawasaki, JP;
Kazuo Miyazaki, Yokohama, JP;
Nippon Oil Co., Ltd., Tokyo, JP;
Abstract
A method for recovering a low molecular weight polymer containing no catalyst residue, which method comprises the steps of: polymerizing a conjugated diolefin or copolymerizing comonomers of conjugated diolefins and a vinyl compound having anionic polymerization activity in the presence of a catalyst containing an organic sodium compound and a chain transfer agent of an alkyl aryl compound; uniformly mixing the obtained polymerization mixture with an isopropyl alcohol aqueous solution; separating the thus obtained mixture into two phases of a polymer mixture containing the liquid low molecular weight polymer and an isopropyl alcohol aqueous solution containing catalyst residue; and separating the low molecular weight polymer from the polymer mixture.