Process for production of aromatic polycarbonate resin and molded article of aromatic polycarbonate resin
First Claim
1. 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 μ
- m or less under a pressure difference of 20 kg/cm2 or more.
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Accused Products
Abstract
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 more, 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.
The present invention provides a process for producing an aromatic polycarbonate resin and its molded article having excellent color and transparency as well as excellent color stability and thermal stability in high efficiency while suppressing contamination with foreign matters and the discoloration and gel formation of the resin.
22 Citations
42 Claims
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1. 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 μ
- m or less under a pressure difference of 20 kg/cm2 or more.
- View Dependent Claims (2, 4, 5, 6, 7, 8, 18, 19, 21, 25, 26)
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3. 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 μ
- m or less under a pressure difference of 40 kg/cm2 or more.
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9. A process for the production of an aromatic polycarbonate resin comprising adding a catalyst deactivation agent to a system within 2 hours after completion of a melt polycondensation reaction in the production of an aromatic polycarbonate resin by the 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.
- 10. 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.
- 11. 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.
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33. 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 μ
- m or less under (2) a pressure difference of 20 kg/cm2 or more.
- View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42)
Specification