Jsp Corporation

Tatsuya Koizumi

Masahiro Gomibuchi

A duct of a foamed blow-molded article that is constituted of a polyolefin-based resin with a bending elastic modulus of 800-1,300 MPa, that has an average apparent density (D) of 0.1 to 0.4 g/cmand an average thickness (T) [cm] providing D&#xd7;Tof 0.005 to 0.04 g/cm, and that has an outer surface side region and an inner surface side region having an average apparent density lower than that of the outer surface region.

Duct

Provided is a hollow foamed blow-molded article having a high heat resistance, employing a thermoplastic resin composition containing a mixed resin of a polyphenylene ether resin and a polystyrene resin, as a base resin. The foamed blow-molded article, may be produced by extruding a foamable molten resin composition obtained by kneading the thermoplastic resin composition and a blowing agent to form a foamed parison, and blow molding the foamed parison. A glass transition temperature of the thermoplastic resin composition is 110&#xb0; C. or higher. A melt viscosity of the thermoplastic resin composition at a temperature of the glass transition temperature+80&#xb0; C. and at a shear rate of 100/sec is 3000 to 9500 Pa&#xb7;s. The physical blowing agent is a blowing agent containing a hydrocarbon compound having 3-5 carbon atoms. A blending amount of the physical blowing agent is 0.4 to 1 mol per kg of the thermoplastic resin composition.

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Kanuma, Japan

Tatsuya Koizumi