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

1982-07-27

Levin, Stanford M.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

525232, 525236, 526 86, 526 66, C08F 238

Patent

active

043418864

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 catalyst 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 to the reaction medium during the course of the polymerization reaction a compound of a transition metal of groups 1B to 7B and 8 or a magnesium compound of the general formula Mg(A).sub.2.

REFERENCES:
patent: 4016347 (1977-04-01), Sommer et al.
patent: 4048427 (1977-09-01), Hargis et al.
patent: 4079176 (1978-03-01), DeZaranz
patent: 4080492 (1978-03-01), DeZaranz
patent: 4092268 (1978-05-01), DeZaranz
patent: 4129705 (1978-12-01), DeZaranz
patent: 4212718 (1980-07-01), Pinazzi et al.

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