Process for purification of styrenic polymer
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United States of America Patent
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Mar 18, 1997
Issued Date -
N/A
app pub date -
Jan 4, 1996
filing date -
Jan 11, 1993
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Expired
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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.
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