Process for producing styrenic polymer

Details Process for producing styrenic polymer Process for producing styrenic polymer

1994-12-27

1995-09-19

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526133, 526134, 526151, 526160, 526905, C08F 4642, C08F 238, C08F 1208

Patent

active

054516480

ABSTRACT:
There is disclosed a process for producing a styrenic polymer having a syndiotactic configuration which comprises polymerizing a styrenic monomer containing hydrogen dissolved therein at a hydrogen partial pressure of at most 1 kg/cm.sup.2 G by the use of a polymerization catalyst comprising an (a) transition metal compound and a (b) coordination complex compound composed of a cation and an anion in which a plurality of radicals are bonded to a metal, or an aluminoxane and, when necessary, a (c) alkylating agent. The above process is capable of modifying the molecular weight of the objective SPS, lowering its molecular weight without expanding the molecular weight distribution, and decreasing the required quantity of the catalyst and the residual quantities of metals in the resultant SPS, whereby the production cost of the objective SPS is considerably curtailed.

REFERENCES:
patent: 4990580 (1991-02-01), Ishihara et al.
patent: 5064918 (1991-11-01), Malanga

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