Sumitomo Electric Industries, Limited

Sumitomo Electric Fine Polymer, Inc.

Satoshi Yamasaki

Yasutaka Emoto

Shinya Nishikawa

Ryota Fukumoto

Takanori Yamazaki

Yuuki Yabe

Shouhei Okabe

Ryouhei Fujita

Makoto Nakabayashi

Hiroshi Hayami

Kentaro Okamoto

Kiyoaki Moriuchi

Takeshi Yamana

Jo Yagisawa

Ryohei Fujita

Kohei Hosomizu

Kazuto Shiina

Mamoru Sekiguchi

Fumitoshi Iyoda

Naoki Izumi

Seiichirou Murata

Tsubasa Takano

A resin composition contains propylene and ethylene and has a melting point of 140° C. or more and 150° C. or less, and an enthalpy of fusion of the resin composition is 60 J/g or more and 100 J/g or less.

Resin composition, resin composition molded body, and power cable

An electrical insulation composition includes a base resin containing 65 parts by mass or more and 98 parts by mass or less of a polyethylene and 2 parts by mass or more and 35 parts by mass or less of a styrene-containing resin, the polyethylene and the styrene-containing resin totaling 100 parts by mass, and 0.05 parts by mass or more and 1.0 parts by mass or less of a fatty acid amide.

Electrical insulation composition and power cable

A method for detecting a residual crosslinking aid in a crosslinked resin molded body includes a subject heating step in which a crosslinked resin molded body is heated at a temperature of 500&#xb0; C. or higher and 700&#xb0; C. or lower for a time of 3 seconds or more and 30 seconds or less, a subject analysis step in which gas chromatographic analysis is performed on a gas generated in the subject heating step, and a detection step in which an unreacted crosslinking aid is detected on the basis of a peak originating from a residual crosslinking aid in a chromatogram obtained in the subject analysis step.

Method for detecting residual crosslinking aid

The heat-recoverable article according to the present invention has a cylindrical shape and includes a base material layer. The base material layer contains a polyolefin-based resin. In the base material layer after being heated at 180&#xb0; C. for 2 minutes, a melting-point peak temperature is 115&#xb0; C. or higher and 128&#xb0; C. or lower, a heat of fusion of a total resin component is 80 J/g or more and 150 J/g or less, a storage modulus at 120&#xb0; C. is 4 MPa or more, a gel fraction is 40% by mass or more and 80% by mass or less, and a storage modulus at 180&#xb0; C. is 0.5 MPa or more and less than 3.0 MPa. The polyolefin-based resin is preferably a mixture of a first polyolefin-based resin having a melting point of 125&#xb0; C. or higher and 135&#xb0; C. or lower and a second polyolefin-based resin having a melting point of lower than 125&#xb0; C.

Heat-recoverable article, method for manufacturing heat-recoverable article, wire splice, and wire harness

A heat-shrinkable tube or heat-shrinkable cap includes an adhesive layer disposed on the inner surface thereof, the adhesive layer including a low-viscosity adhesive layer formed of a resin having a viscosity of 10 Pa&#xb7;s or less at a shear rate of 1 sat the heat shrinkage temperature and a viscosity of 100 Pa&#xb7;s or more at a shear rate of 1 sat the maximum continuous use temperature. The heat-shrinkable tube or heat-shrinkable cap is used for waterproofing an exposed portion of electrical wires of an electrical wire bundle such as a wire harness, in which merely by placing the heat-shrinkable tube or heat-shrinkable cap over the exposed portion of electrical wires, waterproofing and water blocking between strands can be achieved, and outflow of the resin during heat shrinking does not occur. A method of waterproofing an electrical wire bundle uses the heat-shrinkable tube or heat-shrinkable cap.

Heat-shrinkable tube, heat-shrinkable cap, and method of waterproofing electrical wire bundle

A heat-recoverable component includes a tube-shaped or cap-shaped base material layer having heat shrinkability, and an adhesive layer formed on an inner circumferential surface of the base material layer. The adhesive layer includes a low-viscosity adhesive portion and a high-viscosity adhesive portion disposed between the low-viscosity adhesive portion and an opening of the base material layer. The low-viscosity adhesive portion has a shear viscosity of 10 Pa&#xb7;s or less at a shear rate of 1 sat a heat shrinkage temperature of the base material layer. The high-viscosity adhesive portion has a shear viscosity of 100 Pa&#xb7;s or more at a shear rate of 1 sat the heat shrinkage temperature of the base material layer. At the heat shrinkage temperature, a ratio of the shear viscosity of the high-viscosity adhesive portion to the shear viscosity of the low-viscosity adhesive portion is 15,000 or less.

Heat-recoverable component, electrical wire bundle, and insulated electrical wire-covering method

A pressure-sensitive adhesive sheet for covering according to an embodiment of the present invention includes a non-crosslinked rubber component having a maximum peak of the molecular weight distribution in the range of 50,000 to 3,000,000, an oil component having a maximum peak of the molecular weight distribution in the range of 1,000 to 20,000, and carbon black. The content of the non-crosslinked rubber component is 25% to 65% by mass, the content of the oil component is 35% to 75% by mass, and the content of the carbon black relative to 100 parts by mass of the total of the non-crosslinked rubber component and the oil component is 1 to 40 parts by mass.

Pressure-sensitive adhesive sheet for covering

A multilayered heat-recoverable article according to the present invention includes a cylindrical base material layer and an adhesive layer disposed on an inner peripheral surface of the base material layer, in which the base material layer contains a polyethylene and an oxidation inhibitor, the adhesive layer contains an ethylene-vinyl acetate copolymer and an oxidation inhibitor, the oxidation induction temperature of the base material layer is 255&#xb0; C. to 270&#xb0; C., and the oxidation induction temperature of the adhesive layer is 255&#xb0; C. or higher.

Multilayered heat-recoverable article, wire splice, and wire harness

It is an object of the present invention to provide a heat-recoverable article which heat-shrinks in an appropriate temperature range, in which the occurrence of bloom and bleeding is small, and which has excellent resistance to copper-induced damage; and a wire splice and a wire harness each including the heat-recoverable article. A heat-recoverable article according to the present invention has a cylindrical shape and includes a base material layer, in which the base material layer contains an antioxidant and two or more polyolefin resins, the base material layer has one melting-point peak temperature, the melting-point peak temperature is 112&#xb0; C. to 128&#xb0; C., the heat of fusion of all of the resin components of the base material layer is 80 to 130 J/g, and the oxidation induction temperature of the base material layer is 265&#xb0; C. to 280&#xb0; C.

Heat-recoverable article, wire splice, and wire harness

A transparent polyamide resin composition includes a transparent polyamide resin which is a copolymer of an alicyclic diamine and a dicarboxylic acid and which has a refractive index of 1.500 to 1.550, and a transparent crosslinking auxiliary having a refractive index of 1.500 to 1.550, in which the amount of the crosslinking auxiliary added is 13 to 26 parts by mass relative to 100 parts by mass of the transparent polyamide resin, and the crosslinking auxiliary is dispersed, as phases with a diameter of 350 nm or less, in the transparent polyamide resin. A crosslinked transparent polyamide resin molded body is obtained by molding the transparent polyamide resin composition and crosslinking the transparent polyamide resin.

Transparent polyamide resin composition and crosslinked transparent polyamide resin molded body

A multilayered heat-recoverable articleincludes a base material layerand an adhesive layerdisposed on the inner side of the base material layer. The adhesive layerincludes [A] a thermoplastic resin having a melt flow rate of 15 g/10 min to 1,000 g/10 min at 190&#xb0; C. and a load of 2.16 kg, [B] an organically treated layered silicate, and [C] a deterioration inhibitor. The shear viscosity at 150&#xb0; C. of the adhesive layeris 300 Pa&#xb7;s or more at a shear rate of 0.1 sand 200 Pa&#xb7;s or less at a shear rate of 100s.

An object of the present invention is to provide a heat-recoverable article that thermally shrinks in a suitable temperature range and that does not easily split, and a wire splice and a wire harness that use the heat-recoverable article. The heat-recoverable article according to the present invention is a cylindrical, heat-recoverable article including a base layer. The base layer contains two or more polyolefin-based resins and a flame retardant, the base layer has a single melting-point peak temperature, the melting-point peak temperature is 112&#xb0; C. or more and 128&#xb0; C. or less, and a heat of fusion of the base layer is 60 J/g or more and 85 J/g or less. A heat of fusion of a total resin component of the base layer is preferably 80 J/g or more and 135 J/g or less.

A multilayered heat-recoverable articleincludes a base material layerand an adhesive layerdisposed on an inner side of the base material layer. The adhesive layerdoes not flow at a temperature of 135&#xb0; C. and includes a thermoplastic resin and a viscosity characteristics modifier composed of at least one selected from the group consisting of silica, an organically treated layered silicate, and a deterioration inhibitor. In the case where the multilayered heat-recoverable articleis used to cover an insulated electrical wire which includes a conductor and a polyvinyl chloride layer provided on the outer periphery thereof, cracks do not occur in the polyvinyl chloride layer under heating conditions at 135&#xb0; C. for 200 hours.

An object of the present invention is to provide a multilayered heat-recoverable article in which an adhesive layer easily flows during heat shrinkage to ensure adhesiveness with an adherend and does not flow out from a base material layer after heat shrinkage, and a wire splice and a wire harness that include a tube formed by thermally shrinking such a multilayered heat-recoverable article. The multilayered heat-recoverable article () according to the present invention includes a cylindrical base material layer (), and an adhesive layer () formed on an inner circumferential surface of the base material layer. The adhesive layer () is formed of a resin composition that contains a polyamide as a main component and that does not substantially contain an inorganic filler. The resin composition is cross-linked by irradiation with ionizing radiation. A shear viscosity of the adhesive layer () at 150&#xb0; C. is 300 Pa&#xb7;s or more at a shear rate of 0.01 sand 200 Pa&#xb7;s or less at a shear rate of 100 s. The wire splice and the wire harness according to the present invention includes a tube formed by thermally shrinking the multilayered heat-recoverable article ().

Multilayered heat-recoverable article, wire splice, wire harness, and method for producing adhesive for multilayered heat-recoverable article

A flame-retardant resin composition including a resin component containing (A) 30 to 90 parts by weight of a thermoplastic polyurethane elastomer having, as measured according to JIS K 7311, a JIS hardness of A98 or less, (B) 70 to 10 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate unit content of 50 to 90% by weight, (C) 0 to 40 parts by weight of at least one polymer selected from the following copolymers (C1) to (C3), (C1) an acid anhydride-modified ethylene-unsaturated carboxylic acid derivative copolymer, (C2) an epoxy group-having ethylene-olefin copolymer, and (C3) an acid anhydride-modified styrene elastomer, and provided that the total amount of components (A), (B) and (C) is 100 parts by weight, (D) a metal hydroxide in a ratio of 40 to 250 parts by weight with respect to the total amount of 100 parts by weight of the resin component containing (A), (B) and (C).

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Osaka, Japan

Satoshi Yamasaki