Molecular weight regulator for anionic polymerizations

Details Molecular weight regulator for anionic polymerizations Molecular weight regulator for anionic polymerizations

1996-09-19

1997-06-10

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526176, 526335, 526340, 585 18, 585507, 585523, 502117, 502153, 502154, C08F 238, C08F 480

Patent

active

056376618

ABSTRACT:
The subject invention discloses a technique for controlling the molecular weight of synthetic polymers which are made by anionic polymerization. This invention is based upon the discovery that the molecular weight of diene polymers made by anionic polymerization utilizing organolithium initiators can be reduced by conducting the polymerization in the presence of bis(1,5-cyclooctadiene) nickel. The present invention more specifically discloses a process for producing a polymer of controlled molecular weight by anionic polymerization, said process comprising initiating the anionic polymerization of at least one conjugated diolefin monomer with an organolithium compound, wherein the polymerization is conducted in the presence of bis(1,5-cyclooctadiene) nickel. This technique is particularly useful in synthesizing liquid polymers but can also be used to reduce the molecular weight of rubbery polymers.

REFERENCES:
patent: 3400115 (1968-09-01), Dawans et al.
patent: 3631006 (1971-12-01), Hawkins
patent: 3985677 (1976-10-01), Throckmorton et al.
patent: 4338219 (1982-07-01), Naylor
patent: 5502018 (1996-03-01), Chauvin et al.

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