Production of polyisobutenes

Details Production of polyisobutenes Production of polyisobutenes

1995-03-01

1997-10-07

Teskin, Fred

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526221, 526237, 526209, 526290, 5263486, 5263487, 585251, 585253, 585518, C08F 414, C08F 1008

Patent

active

056749554

ABSTRACT:
This invention relates to a method of producing polyisobutenes from a feedstock comprising a mixture of C4 hydrocarbons and containing isobutene and at least 5% by weight of 1-butene using a cationic polymerisation catalyst, characterised in that prior to polymerisation, the feedstock is subjected to a pre-treatment step in order to reduce the 1-butene content thereof to a level which is at least 20% lower than that of the 1-butene content in the initial mixed C4 hydrocarbon feedstock prior to the pre-treatment thereof and the polyisobutene so formed is (a) very high in its vinylidene group content and (b) substantially free of halogen.

REFERENCES:
patent: 2775577 (1956-12-01), Schneider et al.
patent: 4152499 (1979-05-01), Boerzel et al.
patent: 4605808 (1986-08-01), Samson
patent: 5068490 (1991-11-01), Eaton
patent: 5286823 (1994-02-01), Rath
patent: 5416176 (1995-05-01), Hunt
Supported BF.sub.3 catalyst on crystalline polyolefins; carbocationic polymerization of isobutylene, Polymer Bulletin 30, 385-391 (1993) T.C. Chung, A. Kumar, and D. Rhubright.

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