Abstract:
PURPOSE: A branched polycarbonate resin composition is provided to be applied to various molded products including auto parts, a computer housing, and other office supplies due to excellent impact strength, heat resistance, mechanical strength, and workability. CONSTITUTION: A branched polycarbonate resin composition comprises: 80-99 weight% of a polycarbonate resin; 0.5-20 weight% of a polymer having a reactive group and carbon-carbon double bond; and 0.0001-0.8 weight% of an ionic compound including an ion which is selected from an alkali metal ion and an organic cation. The average molecular weight of the polycarbonate resin is 10,000-200,000 g/mol.
Abstract:
A method for preparing a branched polycarbonate resin is provided to allow effective control of the molecular structure, molecular weight and terminal hydroxyl group content of a branched polycarbonate resin, and to inhibit gelling. A method for preparing a branched polycarbonate resin comprises the steps of: carrying out transesterification of an aromatic dihydroxyl compound and diallyl carbonate to form a linear polycarbonate prepolymer; removing the excessive amount of diallyl carbonate and reaction byproducts from the linear polycarbonate prepolymer; and introducing a branching agent to the linear polycarbonate prepolymer from which diallyl carbonate and byproducts are removed and carrying out a reaction.