Sumitomo Electric Fine Polymer, Inc.

Sumitomo Electric Industries, Limited

Yasutaka Emoto

Satoshi Yamasaki

Shinya Nishikawa

Ryota Fukumoto

Ryouhei Fujita

Kazuto Shiina

Shouhei Okabe

Mamoru Sekiguchi

A heat-shrinkable tube according to an aspect of the present disclosure includes a base layer that is tubular and that covers outer peripheries of a plurality of electric wires, and a plurality of ridges that are formed on an inner peripheral surface of the base layer and that extend in an axial direction of the base layer.

Heat-shrinkable tube, heat-shrinkable sheet, connector, and method for manufacturing heat-shrinkable tube

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 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 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 ().

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Sennan-gun, Japan

Yasutaka Emoto