POLYCARBONATE RESIN COMPOSITION AND MOLDED ARTICLE

摘要

Provided is a polycarbonate resin composition including, with respect to 100 parts by mass of an aromatic polycarbonate resin mixture (A) consisting of 5 to 100 mass % of an aromatic polycarbonate-polyorganosiloxane copolymer (A-1) and 95 to 0 mass % of an aromatic polycarbonate resin (A-2) except the component (A-1), the aromatic polycarbonate resin mixture (A) having a content of a polyorganosiloxane unit is 1 mass % or more, 0.002 to 0.200 parts by mass of a phosphorus-based antioxidant (B) and 0 to 0.200 parts by mass of an epoxidation stabilizer (C), in which a reduction ratio P between the viscosity-average molecular weights of the resin composition before and after a pressure cooker test calculated from the calculation equation (I) is 20% or less. The polycarbonate resin composition can be a material for a molded body capable of maintaining its excellent impact-resisting performance at low temperatures for a long time period even when repeatedly used under a high-temperature and high-humidity environment, and its discoloration or the like hardly occurs even when the resin composition is retained at high temperatures.

主权项

1. A polycarbonate resin composition comprising, with respect to 100 parts by mass,
an aromatic polycarbonate resin mixture (A) consisting of 5 to 100 mass % of an aromatic polycarbonate-polyorganosiloxane copolymer (A-1) and 95 to 0 mass % of an aromatic polycarbonate resin (A-2) except the component (A-1), the aromatic polycarbonate resin mixture (A) having a content of a polyorganosiloxane unit is 1 mass % or more, 0.002 to 0.200 parts by mass of a phosphorus-based antioxidant (B) and 0 to 0.200 parts by mass of an epoxidation stabilizer (C),
wherein a reduction ratio P of a viscosity-average molecular weight of the polycarbonate resin composition calculated from the following calculation equation (I) is 20% or less:
P[%]=(M1−M2)/M1×100  calculation equation (I): wherein M1 represents a viscosity-average molecular weight of the polycarbonate resin composition measured after the resin composition is pelletized, M2 represents a viscosity-average molecular weight of the resin composition after a pressure cooker test measured after the pellet is loaded into a pressure cooker tester set to 121° C. and is treated for 300 hours, and P represents the reduction ratio of the viscosity-average molecular weight of the resin composition after the pressure cooker test to the viscosity-average molecular weight of the resin composition before the test.