Method of preparing aromatic polycarbonates

Details Method of preparing aromatic polycarbonates Method of preparing aromatic polycarbonates

C - Chemistry, Metallurgy

08

G

C08G 64/24 (2006.01)

Patent

CA 2095650

A B S T R A C T : TITLE: Method of preparing aromatic polycarbonates The invention relates to a method of preparing aromatic polycarbonates by catalytic interface polymeri- sation of at least one bivalent phenol and a carbonyl halide in the presence of a polycondensation catalyst, which method is characterised in that the conversion is carried out in a two-phase system with continuous dosing of the carbonyl halide, which two-phase system is based on water and an organic solvent, in which the quantity of organic solvent at the beginning of the polyconden- sation lies between 10% and 75% of the quantity of orga- nic solvent which is required at the polymerisation temperature for dissolving the quantity of polycarbonate which may be formed from the quantity of bivalent phenol which is present at the beginning of the polyconden- sation, in that after dosing at least 20% of the car- bonyl halide a remaining quantity of organic solvent is added which is at least sufficient to keep the formed polycarbonate in solution.

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