| 摘要 |
PURPOSE: To provide a method for continuously producing a polycarbonate resin, capable of reducing stamper stains generated on the molding of optical disks, compact disks, etc., and capable of preventing the generation of white spots on molded products under the environments of high temperature and high humidity. CONSTITUTION: A method for continuously producing an optical polycarbonate resin comprises reacting the mixed solution of an aqueous alkali-solution of a dihydric phenol with an organic solvent with phosgene, while maintaining an oil-in-water type suspension state, passing the produced polycarbonate oligomer reaction solution to through an orifice at a velocity of 100-2500cm/s to convert the suspension into a water-in-oil emulsion, repeating at least once a step of passing the produced emulsion through an orifice at a velocity of 100-2500cm/s and then aging the passed emulsion for 1-600sec, adding a polymerization catalyst to the aged product, and subsequently repeating at least once a step of passing the mixture through an orifice at a velocity of >=100cm/s and then aging the passed mixture for 5-600sec to complete the polymerization reaction. Thus, the production of the monomer oligomers is suppressed, and the residual amount of the polymer terminal chloroformate groups are reduced. |
