| 摘要 |
The present invention provides a foamed molded article production method that can produce polycarbonate resin foamed blow-molded articles, etc. Which are good over a wide range of densities. The present invention is a method for producing a foamed molded article including extruding a foamable molten resin, formed by kneading a polycarbonate resin, a polyester resin in an amount of 5 to 100 parts by weight per 100 parts by weight of the polycarbonate resin and a foaming agent, from a die to obtain a foamed parison, and molding the foamed parison in a softened state in a mold. The polyester resin is a polyester copolymer containing diol component units, 10 to 80 mol % of which are glycol component units each having a cyclic ether structure, and dicarboxylic acid component units. |
| 主权项 |
1. 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. |
