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Process for the purification of polycarbonate and polyester carbonate solutions

  • US 5,420,241 A
  • Filed: 04/07/1994
  • Issued: 05/30/1995
  • Est. Priority Date: 04/16/1993
  • Status: Expired
First Claim
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1. A process for the purification of a solution of an aromatic carbonate polymer comprising(i) combining said solution with aluminosilicate,(ii) filtering said solution to separate said aluminosilicate, and(iii) isolating the carbonate polymer, said carbonate polymer being at least one member selected from the group consisting of polycarbonate and polyester carbonate having a weight average molecular weight of about 10,000 to 200,000, said combining consisting of one of (a) agitating and (b) passing through at least one layer of said aluminosilicate, said solution containing about 1 to 30 percent relative to its weight of said carbonate polymer, said purification being carried out at temperatures between 10°

  • and 110°

    C. under pressure of 0 to 10 bar and at a reaction time of 3 to 600 minutes, said purification denoting the virtual freeing of said solution from organic constituents having low molecular weights.

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