Process for production of aromatic polycarbonate resin
Disclosed is a process for producing an aromatic polycarbonate resin, which can prevent the deterioration of a product during the retention of the product in a filter, and which produces contaminants or phenol compounds in reduced amounts. In the production of a purified aromatic polycarbonate resin...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | Disclosed is a process for producing an aromatic polycarbonate resin, which can prevent the deterioration of a product during the retention of the product in a filter, and which produces contaminants or phenol compounds in reduced amounts. In the production of a purified aromatic polycarbonate resin by treating a molten aromatic polycarbonate resin by using a polymer filter, the polymer filter to be used is a filter in which the ratio of the chromium atom concentration to the iron atom concentration (Cr/Fr ratio) on its outermost surface is 1.5 or more as measured by X-ray photoelectron spectroscopy. In one preferred embodiment, the polymer filter to be used is a filter having a carbon film as the outermost surface thereof and an oxide coating film, wherein the carbon film has a thickness of 10 nm or less and the oxide film has a depth-wise thickness of 100 nm or more both as measured by Auger electron spectroscopy. |
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