Patent ID: 9080021
Filing Date: 2015-07-14
Classification: C08G,C08L

Abstract:
1. A method of producing a polycarbonate-polyorganosiloxane copolymer, comprising: (i) continuously or intermittently supplying a polycarbonate oligomer comprising a repeating unit represented by formula (I) and a water-insoluble organic solvent, and a polyorganosiloxane represented by formula (2) and the water-insoluble organic solvent, followed by mixing in the absence of a polymerization catalyst and in the absence of an alkaline compound excluding a tertiary amine and a quaternary ammonium salt, thereby obtaining a first mixed liquid; (ii) continuously or intermittently supplying and mixing the polymerization catalyst into the first mixed liquid in the absence of the alkaline compound excluding a tertiary amine and a quaternary ammonium salt, thereby obtaining a second mixed liquid; (iii) continuously or intermittently supplying and mixing an alkaline compound aqueous solution into the second mixed liquid to perform preliminary polymerization while setting a concentration of the alkaline compound aqueous solution to be supplied to 2 to 15 mass %, thereby obtaining a preliminary polymerization liquid; and (iv) cooling the preliminary polymerization liquid to a temperature of 25° C. or less, followed by continuous or intermittent supply and mixing of the polymerization catalyst, an alkaline compound aqueous solution of a dihydric phenol compound represented by formula (1), and a molecular weight modifier into the preliminary polymerization liquid to perform main polymerization to obtain a polymerization reaction liquid, followed by continuous or intermittent extraction of the polymerization reaction liquid from a reactor, wherein the polycarbonate-polyorganosiloxane copolymer comprises: a main chain comprising a repeating unit represented by formula (I) and a constituent unit represented by formula (II): wherein: R X represents a single bond, an alkylene group comprising 1 to 8 carbon atoms, an alkylidene group comprising 2 to 8 carbon atoms, a cycloalkylene group comprising 5 to 15 carbon atoms, a cycloalkylidene group comprising 5 to 15 carbon atoms, —S—, —SO—, —SO a and b each independently represent an integer of from 0 to 4; R Y represents a single bond, or an organic residue comprising an aliphatic or aromatic moiety; and n represents an average repetition number of from 25 to 50, the polycarbonate-polyorganosiloxane copolymer satisfies the following conditions (a) and (b): (a) a molded article having a thickness of 2 mm made of the copolymer has a total light transmittance measured based on ISO 13468 of 88% or more and a haze measured based on ISO 14782 of 0.7% or less; and (b) a molded article having a thickness of 3 mm made of the copolymer has a total light transmittance measured based on ISO 13468 of 88% or more and a haze measured based on ISO 14782 of 1.0% or less, wherein: R Y represents a single bond, or an organic residue comprising an aliphatic or aromatic moiety; n represents an average repetition number; Z represents a halogen atom, —R m represents 0 or 1, and wherein: R X represents a single bond, an alkylene group comprising 1 to 8 carbon atoms, an alkylidene group comprising 2 to 8 carbon atoms, a cycloalkylene group comprising 5 to 15 carbon atoms, a cycloalkylidene group comprising 5 to 15 carbon atoms, —S—, —SO—, —SO a and b each independently represent an integer of from 0 to 4.