Method for producing polycarbonate resin foam molded article

A method for producing a polycarbonate resin hollow foamed molded article comprising kneading a polycarbonate resin (A), a polyester resin (B) in an amount of 5 to 80 parts by weight per 100 parts by weight of the polycarbonate resin (A) and a foaming agent to obtain a foamable molten resin, extruding the foamable molten resin to obtain a foamed parison, and blow molding the foamed parison, which is maintained in a softened state after extruding the foamable molten resin, in a mold disposed directly beneath a die to form the hollow foamed molded article,

• wherein the polyester resin (B) is a polyester copolymer containing diol component units, 10 to 80 mol % of which are glycol component units each having a cyclic ether structure which is represented by a formula (1) or a formula (2), and dicarboxylic acid component units, and
• wherein the polycarbonate resin (A) is composed of a polycarbonate resin (A1) having a melt viscosity of 2,000 to 3,000 Pa·s at 250° C. and at a shear rate of 100 sec−1 and a polycarbonate resin (A2) having a melt viscosity of 3,500 to 6,000 Pa·s at 250° C. and at a shear rate of 100 sec−1, a weight ratio of the resin (A1) to the resin (A2) being 90:10 to 50:50,
• the formula (1):
• wherein, R1 and R2 each independently represent a characteristic group selected from noncyclic hydrocarbon groups each having 1 to 10 carbon atoms, alicyclic hydrocarbon groups each having 3 to 10 carbon atoms and aromatic hydrocarbon groups each having 6 to 10 carbon atoms, and
• the formula (2):
• wherein, R1 represents a characteristic group selected from noncyclic hydrocarbon groups each having 1 to 10 carbon atoms, alicyclic hydrocarbon groups each having 3 to 10 carbon atoms and aromatic hydrocarbon groups each having 6 to 10 carbon atoms, and
• R3 represents a characteristic group selected from noncyclic hydrocarbon groups each having 1 to 10 carbon atoms, alicyclic hydrocarbon groups each having 3 to 10 carbon atoms and aromatic hydrocarbon groups each having 6 to 10 carbon atoms, and
• wherein the polycarbonate resin hollow foamed molded article has an apparent density of 0.1 to 0.4 g/cm3, an average cell diameter in the thickness direction of 100 to 500 μm, and a closed cell content of 50% or more.