Process for removing contaminants from polycarbonate solutions
AssigneeBayer Aktiengesellschaft
InventorsAlfred Horbach, Hugo Vernaleken
Life of this patent
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Abstract
The contaminating inorganic compounds such as alkali metal salts or alkali metal hydroxides which remain in a polycarbonate solution prepared by reacting phosgene with a dihydroxy-aryl compound are removed by contacting the solution with a molecular sieve.
Claims13
A process for removing inorganic compounds from polycarbonate solutions which comprises contacting a polycarbonate solution with a molecular sieve which is moist with water.
A process for removing inorganic contaminants from a polycarbonate in solution in an organic solvent therefor which comprises contacting the solution with a moist porous hydrophilic gel adapted to be reversibly hydrated with water until the contaminants are absorbed on the gel, and thereafter separating the polycarbonate solution from the gel.
A process for removing inorganic compounds from a solution of a polycarbonate in a solvent which comprises contacting said solution with a molecular sieve wherein the sieve is moist or the solution contains sufficient water to moisten the sieve.
Dependencies are inferred from the claim text.