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. 26, 1982
Filed:
Dec. 02, 1977
Nippon Oil Co., Ltd., , JP;
Abstract
In a method for producing a low molecular weight polymer or copolymer by introducing metallic sodium or an organic sodium compound as a polymerization initiator, an alkyl aryl compound as a chain transfer agent, an inert hydrocarbon as a solvent and a conjugated diolefin or both a conjugated diolefin and a vinyl compound having anionic copolymerization activity with diolefins as a monomer or monomers, into a polymerization vessel and polymerizing or copolymerizing therein successively at a temperature of 0.degree. to 100.degree. C., the improvement in the method for producing a low molecular weight polymer or copolymer having a number average molecular weight of 300 to 10,000 with good reproducibility is characterized in that 0.05 to 10 mole % per 1 mole of the said polymerization initiator, of oxygen is fed into said polymerization vessel.