To provide a method for manufacturing a thermoplastic resin which enables stable fabrication of two or more thermoplastic resins each exhibiting optical anisotropy on melting and having been difficult to mix and fabricate, and a molded product using the thermoplastic resin obtained by this manufacturing method.

The method for manufacturing a thermoplastic resin comprises subjecting at least one thermoplastic resin of the thermoplastic resins having at least one combination of two or more thermoplastic resins which exhibit optical anisotropy on melting and have flow temperatures different from each other by >4°C to heat treatment in an inert gas atmosphere at a temperature of not higher than its flow temperature to render the difference in the flow temperature of ≤4°C and mixing the thermoplastic resins. The flow temperature is a temperature (°C) at which the melt viscosity of the resin, measured by a capillary rheometer, shows 48,000 P when the resin having been molten by heating at a heat-up rate of 4°C/minute is extruded through a nozzle having an inner diameter of 1 mm and a length of 10 mm under a load of 100 kgf/cm2. The molded product such as a film and a hollow molded product is obtained by melt molding the thermoplastic resin obtained by the above method.