Process for preparing a polymer using lithium initiator prepared

Details Process for preparing a polymer using lithium initiator prepared Process for preparing a polymer using lithium initiator prepared

1996-10-16

1998-02-10

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526176, 526178, 526181, 526204, 526217, 526220, 526335, 526340, 5253319, 5253323, 5253329, 525342, 525370, 525374, 525383, 525385, 525386, C08F 448, C08F 1204, C08F 3604

Patent

active

057170436

ABSTRACT:
In a polymerization process of at least one of monomers selected from the group consisting of conjugated diene compounds such as butadiene and vinylaromatic compounds such as styrene, an organolithium compound such as butyllithium is added to the polymerization system first in the presence of the monomer, and thereafter a secondary amine compound such as saturated cyclic imine is added thereto to produce a soluble initiator by bringing the both compound into contact with each other. Polymerization is carried out with the soluble initiator formed. The obtained high molecular weight polymer is modified with a coupling agent such as tin tetrachloride. The polymer obtained has a high molecular weight, a narrow molecular weight distribution, and controlled molecular weight, and exhibits remarkable coupling property, low hysteresis loss. The process provides a polymer having a consistent characteristic, regardless of production scale and procedures of adding materials.

REFERENCES:
patent: 2849432 (1958-08-01), Kibler et al.
patent: 5332810 (1994-07-01), Lawson et al.
patent: 5552473 (1996-09-01), Lawson et al.
Butyl Lithium-Catalyzed Stereoselective Telomeriaztion of 1,3-Diene--A Novel Synthesis of 1,3-Diene--A Novel Synthesis of H,H-Dialkyl(OCTA-cis-2,6-Dienyl) Amine Derivative Tetrahedron Letters No. 39, pp. 4009-4012, 1972, Pergamon Press.

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