Catalyzed interfacial polycondensation polycarbonate process
First Claim
1. A method of producing aromatic polycarbonate by a catalyzed interfacial polycondensation polycarbonate process comprising(1) forming an agitated two-phase admixture comprising(i) an organic phase containing an inert organic solvent and a polycondensation catalyst,(ii) an aqueous phase containing dissolved therein an aromatic dihydroxy compound, a strong base and an ionic surfactant in a quantity of from about 100 to 1,000 parts per million having a pH of at least 11 subject to the proviso that(a) the volume ratio of inert organic solvent phase to aqueous phase is within the range of from about 0.04:
- 1 to 0.20;
1 and(b) the mole ratio of base to aromatic dihydroxy compound is at least about 0.25;
1,(2) adding and reacting a carbonyl halide with the aromatic dihydroxy compound to form an aromatic polycarbonate having a weight average molecular weight of at least about 2000, and(3) separating and recovering the solid aromatic polycarbonate particulate from the liquid aqueous phase.
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Abstract
This invention relates to a catalyzed interfacial polycondensation aromatic polycarbonate process which comprises forming an agitated two-phase mixture comprising an organic solvent phase with catalyst and an aqueous phase containing an aromatic dihydroxy compound, a base and an ionic surfactant. A carbonyl halide is added to the mixture and reacted with the aromatic dihydroxy compound to form an aromatic polycarbonate. The aromatic polycarbonate is recovered from the aqueous phase.
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16 Claims
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1. A method of producing aromatic polycarbonate by a catalyzed interfacial polycondensation polycarbonate process comprising
(1) forming an agitated two-phase admixture comprising (i) an organic phase containing an inert organic solvent and a polycondensation catalyst, (ii) an aqueous phase containing dissolved therein an aromatic dihydroxy compound, a strong base and an ionic surfactant in a quantity of from about 100 to 1,000 parts per million having a pH of at least 11 subject to the proviso that (a) the volume ratio of inert organic solvent phase to aqueous phase is within the range of from about 0.04: - 1 to 0.20;
1 and(b) the mole ratio of base to aromatic dihydroxy compound is at least about 0.25;
1,(2) adding and reacting a carbonyl halide with the aromatic dihydroxy compound to form an aromatic polycarbonate having a weight average molecular weight of at least about 2000, and (3) separating and recovering the solid aromatic polycarbonate particulate from the liquid aqueous phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- 1 to 0.20;
Specification