Patent ID: 6271290
Filing Date: 2001-08-07
Classification: C08G,C08K

Abstract:
A polycarbonate resin composition for optical use comprising:(A) polycarbonate prepared by melt polycondensing a bisphenol and a carbonic acid diester in the presence of an alkaline catalyst, to form a reaction product, and subsequently adding 0.1 to 4.5 ppm of a sulfur-containing acidic compound, or a derivative of the acidic compound which has a pKa of less than 3, to the reaction product,(B) phosphorous acid,(C) a sulfur-containing acidic compound or its derivative having a pKa of less than 3, and(D) an ester derived from a mono-fatty acid of 10 to 22 carbon atoms and a polyhydric alcohol,wherein with respect to the polycarbonate constituent (A), the content of the phosphorous acid constituent (B) in the composition is 0.1 to 10 ppm, the content of the acidic compound constituent (C) in the composition is 0.1 to 3 ppm, and the content of the ester constituent (D) in the composition is 50 to 1000 ppm.