Jsp Corporation

Masahiro Gomibuchi

Tomoo Tokiwa

Daisuke Imanari

Toshio Morita

Tatsuya Koizumi

Kazunobu Sato

Jinichiro Noro

A method for producing a polypropylene-based resin foamed molded article by blow molding a foamed parison formed of a base resin, in which: the base resin contains, in specific mixing proportions, a branched polypropylene-based resin (A), a linear polypropylene-based resin (B) and a recovered raw material (C) that is recovered in the course of production of the polypropylene-based resin foamed molded article. Each of the resin (A), resin (B) and the recovered raw material (C), has a specific range of a melt tension and a melt flow rate. A difference in melting point between the resin (A) and resin (B) is within a specific range. A difference in crystallization temperature between the resin (A) and resin (B) is within a specific range.

Method for producing polypropylene-based resin foamed molded article

A method for producing a foamed blow-molded article, which includes extruding a physical blowing agent-containing foamable molten resin downwardly through a annular die to form a tubular foamed parison, clamping the foamed parison between split molds, and then blow molding it. At the latest before completion of the clamping of the foamed parison between the split molds, a gas is blown toward an inner peripheral surface of an upper portion of the foamed parison, the bottom portion of which has been closed, from a gas ejection outlet located within the foamed parison at a position immediately below the annular die to widen the foamed parison.

Method for producing foam blow-molded article

A method for producing a skin-covered foamed molded article including blow-molding a parison in a mold cavity to form a skin consisting of a hollow molded body, in which the parison is in a softened state by extruding a molten thermoplastic resin, filling expanded beads in the hollow molded body, and heating and fusion bonding the beads by supplying steam via a steam supply pipe inserted into the hollow molded body. The parison is in contact with a protruding portion, formed by protrusion from an inner surface of the mold cavity to an inside of the cavity, forming a recessed portion having a shape corresponding to the protruding portion in the inward direction of the hollow molded body. A steam hole is formed in the recessed portion, a steam supply pipe is inserted into the body, and the expanded beads are heated and fusion bonded by supplying steam.

Method for producing skin-covered foamed molded article and apparatus for producing thereof

A method for producing a skin-covered foamed molded article includes blow molding a parison into a skin and heating expanded polystyrene beads filled in a hollow space of the skin to form a foam layer fuse-bonded to the skin, polystyrene resin composition having specific Charpy impact strength, MFR and branching degree. The skin of the skin-covered foamed molded article is formed of the specific polystyrene resin composition.

Method for producing skin-covered foamed molded article and resulting product

A process for producing a foamed blow-molded article, including melting and mixing a branched polycarbonate resin having a specific polystyrene equivalent weight average molecular weight, a specific weight average absolute molecular weight and a relatively high terminal hydroxyl group content, a linear polycarbonate resin having specific polystyrene equivalent weight average molecular weight, a specific weight average absolute molecular weight and a relatively low terminal hydroxyl group content and a branching agent to obtain a polycarbonate resin 'A', mixing the polycarbonate resin 'A' with a blowing agent to obtain a foamable molten resin composition, extruding the foamable molten resin composition to obtain a foamed parison, and blow-molding the foamed parison.

Polycarbonate resin foamed blow-molded article and process for producing same

Provided is a method that can improve formability and blow moldability of a foamed parison as compared with conventional production method and can produce a polypropylene-based resin foamed blow-molded article having excellent uniformity of wall thickness over a wide range of its density. The method comprises kneading a polypropylene-based resin with a physical foaming agent, extruding the thus obtained foamable molten resin through a die to obtain a foamed parison in a softened state, placing the foamed parison between molds and then blow-molding the foamed parison and is characterized in that the polypropylene-based resin comprises a polypropylene-based resin (A) satisfying specific requirements (1) to (3) and a polypropylene-based resin (B) satisfying a specific requirement (4), when the polypropylene-based resins (A) and (B) are each subjected to dynamic viscoelasticity measurement in which an oscillation strain is applied thereto at a temperature of 190&#xb0; C., and that the mixing ratio by weight (A:B) of the resin (A) to the resin (B) is in the range of 100:0.5 to 100:5.

Method for producing polypropylene-based resin foamed blow-molded article

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.

Method for producing polycarbonate resin foam molded article

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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Shimotsuke, Japan

Masahiro Gomibuchi