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:
May. 19, 1981
Filed:
Mar. 21, 1980
Richard F Palmer, Vancouver, WA (US);
Phillips Petroleum Company, Bartlesville, OK (US);
Abstract
Incremental addition of a monomer to be polymerized or copolymerized in a reaction medium comprising an alkyl aromatic, an organic lithium compound, and a transmetallation compound is effected to obtain liquid polymers and/or copolymers of narrow molecular weight range distribution suitable for conversion to lubricating oil as by hydrogenation. A conjugated diene, e.g., butadiene, alone, or together with a vinyl aromatic, e.g., styrene, is added incrementally to permit substantially complete reaction of at least the incrementally added monomer(s) and transmetallation to occur from living polymer to the alkyl aromatic in the reaction mass before addition of a succeeding increment.