Mitsubishi Gas Chemical Company, Inc.

Mitsubishi Chemical Corporation

Kenji Kouno

Tomonori Kato

Chiharu Nishizawa

Ryoji Otaki

Jun Mitadera

Hiroshi Kobayashi

Kentaro Ishii

Goro Shimaoka

Takanori Miyabe

Hiroyuki Nanba

Atsushi Nakagawa

Masaki Yamanaka

Makoto Takahashi

A polyolefin-based structure includes 60 to 97% by mass of a polyolefin (A), 1 to 35% by mass of an acid-modified polyolefin (B), and 2 to 35% by mass of a polyamide resin (C), in which the polyamide resin (C) is dispersed in a layered form in the polyolefin (A), and the polyamide resin (C) is a melt-kneaded product of 30 to 70% by mass of a polyamide (X) that contains a diamine unit containing 70 mol % or more of a m-xylylenediamine unit and a dicarboxylic acid unit containing an &#x3b1;,&#x3c9;-linear aliphatic dicarboxylic acid unit and 30 to 70% by mass of an aliphatic polyamide (Y) (provided that a total of the polyamide (X) and the polyamide (Y) is taken as 100% by mass), and a difference between a melting point Tmof the polyamide (X) as observed by differential scanning calorimetry and a melting point Tmderived from the polyamide (X) in the polyamide resin (C), is 0.1 to 2.5&#xb0; C.

Polyolefin structure

A container cap is a container cap including a molded article formed of a resin composition containing 70 to 94% by mass of a polyolefin (A), 3 to 15% by mass of an acid-modified polyolefin (B) and 3 to 15% by mass of a m-xylylene group-containing polyamide (C), in which a ratio (X/Y) of a percentage (X) of polyamide-derived nitrogen in a cap top surface portion to a percentage (Y) of polyamide-derived nitrogen in a cap side surface portion, is 1.2 to 3.0, as measured by a total nitrogen analysis.

Container cap and production method for container cap

The production method for a polyolefin-based structure of the present invention produces a polyolefin-based structure from a mixed source material containing a polyolefin (A), an acid-modified polyolefin (B) and a gas barrier resin (C) using a molding machine, under the condition mentioned below. The molding machineis equipped with a single-screw extruder, a die head, and an adaptorfor feeding the mixed source material from the single-screw extruderto the die head. Am+10&#xb0; C.&#x2264;T&#x2264;Cm&#x2212;10&#xb0; C. (1), Cm&#x2212;30&#xb0; C.&#x2264;T&#x2264;Cm+30&#xb0; C. (2), Cm&#x2212;10&#xb0; C.&#x2264;T&#x2264;Cm+50&#xb0; C. (3), Cm&#x2212;30&#xb0; C.&#x2264;T&#x2264;Cm+30&#xb0; C. (4). Tis a cylinder temperature in a section corresponding to a supply zoneA and a compression zoneB, Tis a cylinder temperature in a section corresponding to a metering zoneC, Tis a temperature of an adaptor, Tis a temperature of a die head, Am is the melting point of the component (A), and Cm is the melting point of the component (C).

Method for producing a polyolefin structure

The present invention provides a method of manufacturing a practical direct-blow molded container having excellent barrier property against fuels, chemicals, various gases including oxygen. The method of manufacturing a practical direct-blow molded container containing the metaxylylene group-containing polyamide (C) being dispersed and layered in the polyolefin (A) includes using a die provided with a die body having a flow hole in which the melted resin extruded from an extruder flows and a cylindrical hollow having an opening in the lower side and the flow hole in the upper side, the opening and the flow hole opening downward and upward, respectively, a mandrel having a tip in the upper side, the tip pointing to the opening of the tip of the flow hole, a flow path clearance formed between the hollow of the die body and the mandrel, the flow path clearance defining a resin flow path, and a support part formed in the flow path clearance, the support part holding the mandrel in the hollow of the die body.

Direct blow-molded container manufacturing method and package

The present invention provides a polyethylene-based structure including from 60 to 90% by mass of a polyethylene (A), from 5 to 35% by mass of an acid-modified polyethylene (B) and from 5 to 35% by mass of a m-xylylene group-containing polyamide (C), in which the m-xylylene group-containing polyamide (C) is dispersed in a layer form in the polyethylene (A) to partially form a continuous phase thereof, and has a relative viscosity of from 2.5 to 4.5.

Polyethylene-based structure

A stretched polyamide film including at least one stretched layer made of a mixed resin containing a polyamide resin and a modified polyester-based elastomer Y. The polyamide resin X is mainly constituted by m-xylylenediamine unit and C&#x3b1;,&#x3c9;-aliphatic dicarboxylic acid unit. The modified polyester-based elastomer is graft-modified with an ethylenically unsaturated carboxylic acid or its anhydride. Such stretched polyamide film is drastically improved in the flexibility, impact resistance and pin-hole resistance with little reduction in the gas-barrier properties while retaining an enough transparency to practical use.

Stretched polyamide films

A plastic molded article laminated a layer with a photochromic property and/or a layer with a polarization property on at least one side of a base material, said base material being a polycarbonate having a photoelastic constant of 55&#xd7;10m/N or below.

Plastic molded product having photochromic characteristic and/or polarizing characteristics

A transparent synthetic resin laminate with photochromism property consisting essentially of two transparent synthetic resin layers and a photochromic layer formed by curing a mixture of a two liquid polyurethane of a polyurethane prepolymer and a curing agent and a photochromic organic compound which is interposed between said two transparent synthetic resin layers.

Transparent synthetic resin laminate having photochromism

A synthetic resin laminate having both phtochromism characteristic and polarization characteristic consisting essentially of two transparent synthetic resin layers, a resin layer having phtochromism characteristic and a resin layer having polarization characteristic interposed between said two transparent synthetic resin layers and an adhesive layer to adhere said resin layer having polarization characteristic to said one transparent synthetic resin layer, wherein said one transparent synthetic resin layer to contact said resin layer having phtochromism characteristic has a thickness of 50 &mgr;m or above and a retardation value of 150 nm or below, or 3000 nm or above.

Synthetic resin laminate having both polarization characteristic and photochromism characteristic

An aromatic polycarbonate resin composition for molding, comprising (a) an aromatic polycarbonate resin, (a) carbon fibers sized with an aromatic polycarbonate resin, and (c) an organic compound having at least two oxazoline rings per molecule is dislosed. The composition has excellent extrusion workability, mold deposit-preventing property and mechanical strength, and can be used as a molding material in the field of precision machines such as cameras, VTR's and facsimiles.

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Kanagawa, Japan

Kenji Kouno