Process for preparing bimodal or multimodal polymers of conjugat

Details Process for preparing bimodal or multimodal polymers of conjugat Process for preparing bimodal or multimodal polymers of conjugat

1981-04-06

1982-11-30

Levin, Stanford M.

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

Synthetic resins

Polymerizing in two or more physically distinct zones

525232, 525236, 526 78, 526 79, 526 86, C08F 408

Patent

active

043616828

ABSTRACT:
A process of preparing a bimodal or multimodal homopolymer of a conjugated diene or a bimodal or multimodal copolymer of a conjugated diene with another conjugated diene or with a vinyl aromatic compound consists in polymerizing the monomer(s) in a reaction medium at a temperature of between 20.degree. C. and 200.degree. C. in the presence of a catalytic system comprising an organolithium initiator, a barium, strontium or calcium compound, and an organometallic compound of a metal of group 2B or 3A of the periodic classification of elements of the Mendeleev Table and adding hydrogen as a modifying agent to the reaction medium during the course of the polymerization reaction.

REFERENCES:
patent: 4079176 (1978-03-01), Zarauz
patent: 4080492 (1978-03-01), Zarauz
patent: 4092268 (1978-05-01), Zarauz
patent: 4129705 (1978-12-01), Zarauz

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