Catalyst system for the synthesis of rubbery polymers

Details Catalyst system for the synthesis of rubbery polymers Catalyst system for the synthesis of rubbery polymers

1996-07-29

1997-05-13

Teskin, Fred

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Organic compound containing

502155, 502156, 526180, 526181, 526183, 526340, C08F 450

Patent

active

056292562

ABSTRACT:
The subject invention relates to an anionic polymerization technique for synthesizing rubbery polymers of conjugated diolefin monomers, such as rubbery copolymer of .alpha.-methylstyrene and 1,3-butadiene. These rubbery copolymers exhibit an excellent combination of properties for utilization in tire tread rubber compounds. They have high trans-isomer contents which leads to good treadwear characteristics and a broad molecular weight distribution which enhances processability. This invention more specifically discloses a process for the synthesis of rubbery polymers which have a broad molecular weight distribution and which are particularly useful in tire tread rubber compounds, said process comprising the polymerization of at least one conjugated diolefin monomer in an organic solvent in the presence of a catalyst system which is comprised of (a) a dialkyl magnesium compound and (b) an alkali metal containing compound selected from the group consisting of alkali metal alkoxides, alkali metal phenoxides, alkali metal sulfoxides, alkali metal sulfonates, alkali metal carboxylates, alkyl substituted alkali metal phenoxides, alkali metal alkylamines, and alkali metal dialkylamines; wherein the molar ratio of the alkali metal containing compound to the dialkyl magnesium compound is within the range of about 6:1 to about 1:5. In cases where rubbery copolymers containing .alpha.-methylstyrene are being synthesized the alkali metal in the alkali metal containing compound will normally be potassium, rubidium, or cesium with cesium being most preferred.

REFERENCES:
patent: 3240772 (1966-03-01), Natta et al.
patent: 3331821 (1967-07-01), Strobel
patent: 3496154 (1970-02-01), Wofford
patent: 3644313 (1972-02-01), Cheng et al.
patent: 3775392 (1973-11-01), Cheng et al.
patent: 3781260 (1973-12-01), Halasa
patent: 3925511 (1975-12-01), Loveless
patent: 4174431 (1979-11-01), Halasa et al.
patent: 4225690 (1980-09-01), Halasa et al.
patent: 4277591 (1981-07-01), Naylor
Hsieh, J. Poly. Sci, A-1, 8, 533-543 (1970).

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