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AssigneeTeijin Limited
InventorsKyosuke Matsumoto, Masasi Simonaru, Toru Sawaki, Katsushi Sasaki, Masahiro Murakami, Yoshiki Matsuoka
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An aromatic polycarbonate resin is produced under the conditions that the flow velocity of the reaction mixture in a pipe through which a molten reaction mixture passes is a specific value or over, the viscosity-average molecular weight of the reaction mixture is 1,000 or more, the sum of the average retention times of the reaction mixture is not longer than 3 hours, the wall temperature of the pipe through which a molten reaction mixture passes is set to be higher than the temperature of the reaction mixture in the pipe, the catalyst deactivation agent is added within 2 hours after the completion of the melt polycondensation reaction, the filtration is carried out by using a filter having a specific retained particle size under a specific pressure difference, specific treated amount of the aromatic polycarbonate resin per unit area of the filter and a ratio of W (flow quantity of filtered polymer)×1,000/A (maximum area of the polymer path in the filtration vessel) falling within a specific range, etc.
A process for the production of an aromatic polycarbonate resin comprising filtering an aromatic polycarbonate resin having a viscosity-average molecular weight of 10,000 or more in a molten state with a filter having a retained particle size of 40 μm or less under a pressure difference of 20 kg/cm2 or more.
A process for the production of an aromatic polycarbonate resin comprising filtering an aromatic polycarbonate resin having a viscosity-average molecular weight of 10,000 or more in a molten state with a filter having a retained particle size of 10 μm or less under a pressure difference of 40 kg/cm2 or more.
A process for the production of an aromatic polycarbonate resin wherein a flow velocity of a reaction mixture in a pipe through which a molten reaction mixture passes is 0.5 cm/sec or more in a production of an aromatic polycarbonate resin by continuous melt polycondensation of a mixture containing an aromatic dihydroxy compound and an aromatic carbonic acid diester as main components in the presence of a catalyst.
A process for the production of an aromatic polycarbonate resin wherein a flow velocity of a reaction mixture in a pipe through which a molten reaction mixture passes is 2 cm/sec or more in a production of an aromatic polycarbonate resin by continuous melt polycondensation of a mixture containing an aromatic dihydroxy compound and an aromatic carbonic acid diester as main components in the presence of a catalyst.
A process for the production of an aromatic polycarbonate resin comprising filtering an aromatic polycarbonate resin having a viscosity average molecular weight of 10,000 or more in a molten state with (1) a filter unit constructed by piling up a plurality of disk type filter elements having an outer diameter of 4 to 15 inches, an inner diameter/outer diameter ratio of 1/7 or more and a retained particle size of 40 βm or less under (2) a pressure difference of 20 kg/cm2 or more.
Dependencies are inferred from the claim text.