Polycarbonate resin composition for gas assist injection molding, process for producing blow-molded article, and blow-molded article

摘要

Disclosed is a method for producing blow moldings of essentially polycarbonate resin. The blow moldings may have a relatively high percentage of hollowness, and may have a ribbed structure, and their wall thickness is uniform. Forming ribs in the blow moldings is easy. Also disclosed is a polycarbonate resin composition for the method. The polycarbonate resin composition is for gas assist injection molding and comprises (A) from 30 to 100% by weight of a polycarbonate resin and (B) from 0 to 70% by weight of a styrenic resin. The melt viscosity ratio, H/L, of the melt viscosity of the resin composition, H (Pasec), measured at a shear rate of 10 (sec¹) at the optimum molding temperature to the melt viscosity thereof, L (Pasec), at a shear rate of 1000 (sec¹), is at least 5. When the polycarbonate resin composition is molded into blow moldings in a mode of gas assist injection molding, the mold cavity volume is expanded while the pressure gas is still in the resin melt in the mold cavity. Provided are the blow moldings of the polycarbonate resins produced in the gas assist injection molding method.