Process for purification of styrenic polymer

Details Process for purification of styrenic polymer Process for purification of styrenic polymer

1996-01-04

1997-03-18

Weber, Thomas R.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528495, C08F 624

Patent

active

056124520

ABSTRACT:
The present invention relates to a process for efficiently purifying a styrenic polymer which comprises adding a poor solvent alone or in combination with a swelling agent to a syndiotactic polystyrene produced by the use of a catalyst comprising (A) an aluminoxane or a coordination complex compound comprising a cation and an anion in which a plurality of radicals are bonded to a metal and (B) a transition metal compound, and treating the polystyrene under a controlled water content of 15 to 10,000 ppm to simultaneously carry out deactivation and deashing. The above process can efficiently remove residual metals without using a deashing agent and afford a highly pure high-grade crystalline styrenic polymer excellent in color tone.

REFERENCES:
patent: 5247020 (1993-09-01), Nakano et al.
patent: 5321122 (1994-06-01), Kuramoto et al.

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