Diene elastomers with cyclic vinyl units and processes for...

Details Diene elastomers with cyclic vinyl units and processes for... Diene elastomers with cyclic vinyl units and processes for...

2004-01-14

2008-12-30

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...

C526S175000, C526S180000, C526S181000, C526S335000, C525S331900, C502S154000, C502S155000, C502S156000

Reexamination Certificate

active

07470760

ABSTRACT:
The present invention relates to a linear or branched diene elastomer having cyclic vinyl units. A linear diene elastomer according to the invention results from at least one conjugated diene and it comprises cyclic vinyl units in a mass content of greater than or equal to 15% while having a number-average molecular weight falling within a range of from 10,000 to 300,000 g/mol. The invention also relates to a process for the productionof such a linear or branched diene elastomer including cyclic vinyl units in the above-stated content and having a number-average molecular weight ranging from 10,000 to 300,000 g/mol, such that said process includes the continuous reaction of at least one conjugated diene monomer in an inert aliphatic or alicyclic hydrocarbon solvent with a catalytic system comprising an organolithium initiator, a polar agent having two or more heteroatoms and an alkali metal salt of an aliphatic or alicyclic alcohol, where:(i) the (polar agent:initiator) molar ratio is greater than or equal to 3.(ii) the (salt:initiator) molar ratio falls within a range of from 0.01 to 2, and(iii) the (salt:polar agent) molar ratio falls within a range of from 0.0001 to 0.5.

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