Method for preparing a diene elastomer

Details Method for preparing a diene elastomer Method for preparing a diene elastomer

2008-07-08

2008-07-08

Teskin, Fred M (Department: 1796)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S088000, C526S161000, C526S162000, C526S164000, C526S340400, C526S907000

Reexamination Certificate

active

07396889

ABSTRACT:
A method for preparing a diene elastomer, such as a butadiene homopolymer or copolymer, in particular, a polybutadiene, with a high level of cis-1,4 linkages that has both a Mooney viscosity greater than or equal to 40 and a polydispersity index of less than 2.1. The method comprises a reaction of a catalyst system with at least one conjugated diene monomer to be polymerized and the catalyst system is based on at least:optionally one preforming conjugated diene;one salt of one or more rare earth metals;an inert hydrocarbon-based solvent;an alkylating agent comprising an allyl derivative of aluminum of formula R″nAlR′3-n, where R′ is a saturated or unsaturated alkyl group or else a hydride, where R″ is an allyl group and where n is an integer inclusively between 1 and 3; anda halogen donor that belongs to the family of alkylaluminum halides, excluding alkylaluminum sesquihalides.

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French Search Report issued in corresponding French Application No. 06/03594.

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