Process for production of high-isoprene butyl rubber

Details Process for production of high-isoprene butyl rubber Process for production of high-isoprene butyl rubber

2007-10-16

2007-10-16

Teskin, Fred (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S336000, C526S339000

Reexamination Certificate

active

10776761

ABSTRACT:
The present invention relates to a continuous process for producing polymers at conversions ranging from 50% to 95% having a Mooney viscosity of at least 25 Mooney-units and a gel content of less than 15 wt. % containing repeating units derived from at least one isoolefin monomer, more than 4.1 mol % of repeating units derived from at least one multiolefin monomer and optionally further copolymerizable monomers in the presence of AlCl3and a suitable proton source (e.g. water) or cationogen and at least one multiolefin cross-linking agent wherein the process is conducted in the absence of transition metal compounds and organic nitro compounds.

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Ullmanns Encyclopedia of Industrial Chemistry, vol. A 23 (month unavailable) 1993, pp. 288-295, “Rubber, 3. Synthetic”.
Rubber Chemistry & Technology 49, (month unavailable) 1976, pp. 960-966, W.A. Thaler and D.J. Buckley Sr., Meeting of the Rubber Division, ACS, Cleveland, Ohio, May 6-9, 1975, High-Molecular-Weight, High-Unsaturation Copolymers of Isobutylene and Conjugated Dienes. I. Synthesis.

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