Abstract:
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, the (A), resin (B) and the recovered raw material (C) each has a specific range of a melt tension and a melt flow rate, a difference in melting point between the (A) and resin (B) is within a specific range, and a difference in crystallization temperature between the (A) and resin (B) is within a specific range.
Abstract:
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.
Abstract:
PROBLEM TO BE SOLVED: To provide a multilayered direct blow-molded body showing superiority in a barrier property to a liquid fuel containing alcohols and ethers and strength, and to provide a vessel for a fuel composed of the same. SOLUTION: In the multilayered direct blow-molded body having a polyethylene-based resin layer (II) inside a polyamide layer (I), the polyamide layer (I) contains a meta-xylylene group-possessing polyamide (A1) and an aliphatic polyamide (A2). The content of the polyamide (A1) is 10 to 45 mass%, and the content of the polyamide (A2) is 90 to 55 mass%, the sum of the contents of the polyamides (A1) and (A2) being 100 mass%. The polyamide (A1) is composed of a diamine unit containing not less than 70 mol% of a meta-xylylenediamine unit, and a dicarboxylic acid unit containing not less than 70 mol%, based on the sum, of two kinds of dicarboxylic acid units of an α, ω-4 to 20C linear aliphatic dicarboxylic acid unit and an isophthalic acid unit, the ratio of the α, ω-4 to 20C linear aliphatic dicarboxylic acid unit to the isophthalic acid unit being 30:70 to 95:5. The aliphatic polyamide (A2) is at least one selected from the group consisting of nylon 6, nylon 666, nylon 610 and nylon 612. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing at favorable productivity, a skin-covered foamed molded body with sufficient adhesion of a skin with a foamed particle-molded body even if its shape is long or complicated.SOLUTION: A production method includes: forming a hollow molded body by blow-molding a softened parison comprising a polystyrene resin; filling the inside of the hollow molded body with the foamed particles of polystyrene resin; and fusion-bonding the foamed particles with each other by heating and further fusion-bonding with the inner face of the hollow molded body to produce a skin-covered foamed molded body in which the foamed particle molded body is covered by the skin comprising the hollow molded body. The parison is composed of a polystyrene resin composition satisfying the specific conditions.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing a foamed molding which can manufacture a favorable polycarbonate-based resin foamed blow molding or the like over a wide density range.SOLUTION: The method of manufacturing the foamed molding forms a foamed parison by extruding a foamable melted resin which is obtained by kneading a polycarbonate-based resin and 5 to 100 pts.wt. of a polyester-based resin based on 100 pts.wt. of the polycarbonate-based resin, and molds the softened foamed parison by using a metal mold. The polyester-based resin is a polyester copolymer composed of a diol component unit containing 10 to 80 mol% of a glycol component unit having an annular ether skeleton and a dicarboxylic acid component unit.
Abstract:
PROBLEM TO BE SOLVED: To provide a skin-covered foamed molded article which is excellent in fusion bonding of foamed particles, each other, and adhesion of the foamed particles and the skin, in which a prolonged molding cycle is not required when manufacturing the skin-covered foamed molded article by blow-molding a hollow molded body, filling the foamed particles in the hollow molded body, heating and fusion-bonding.SOLUTION: The method for manufacturing the skin-covered foamed molded article includes: a step of forming the hollow molded body 3 having a recessed portion 30 corresponding to the shape of a protruding portion 41 by abutting a parison with the protruding portion 41 formed projectively on an inner surface 2 of a mold cavity, and blow-molding; a step of penetrating a steam supply tube 42 through the recessed portion 30; a step of inserting the steam supply tube 42 into the hollow molded body 3; a step of supplying the steam from the steam supply tube 42 inserted into the hollow molded body 3; and a step of heating and fusion-bonding the foamed particles.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing a foam blow molding capable of manufacturing a good polycarbonate resin foam blow molding over a wide range of apparent density.SOLUTION: This method of manufacturing a polycarbonate resin foam blow molding forms a foam parison by extruding a foaming molten resin including a polycarbonate resin A and a foaming agent and blow molds the foam parison in a softened state. The polycarbonate resin A comprises: a branched polycarbonate resin B having a large amount of terminal hydroxyl groups having a specific average molecular weight; a linear polycarbonate resin C having a small amount of terminal hydroxyl groups having the specific average molecular weight; and a branching agent D. A mass ratio (B:C) between the branched polycarbonate resin B and the linear polycarbonate resin C is 30:70 to 95:5.
Abstract:
PROBLEM TO BE SOLVED: To provide a hollow foamed blow-molded article having high heat resistance and a high expansion ratio in which a base resin is a thermoplastic resin including a mixed resin of polyphenylene ether-based resin and polystyrene-based resin.SOLUTION: There is provided a method for producing a foamed blow-molded article comprising: extruding a foamable molten resin composition obtained by kneading a thermoplastic resin composition including a mixed resin of polyphenylene ether-based resin and polystyrene-based resin and a foaming agent to form a foamed parison; and performing blow-molding of the foamed parison. The thermoplastic resin composition has a glass transition temperature of 110°C or more and a melt viscosity of 3000-9500 Pa s, at a temperature of the glass transition temperature +80°C and at shear rate of 100/sec. The physical foaming agent includes a hydrocarbon compound having 3-5 carbon atoms. The compounded amount of the physical foaming agent is 0.4-1 moles per 1 kg of the thermoplastic resin composition.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of producing a foam blow-molded article of polypropylene-based resin by which foaming properties and blow-moldability of a foamed parison are improved compared to the conventional production methods, and a molded article having high uniformity of wall thickness over a wide range of density is obtained as a result.SOLUTION: The method for producing a polypropylene-based resin foamed blow-molded article comprises: kneading a polypropylene-based resin with a physical foaming agent; extruding thus obtained foamable resin melt through a die to obtain a soft foamed parison; and inserting the foamed parison in a mold and then blow-molding the same. The method is characterized in that the polypropylene-based resin comprises a polypropylene-based resin (A) satisfying specific requirements (1)-(3) and a polypropylene-based resin (B) satisfying a specific requirement (4), each in measuring dynamic viscoelasticity imparting a vibration strain at 190°C, and 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.