Heat-recoverable article, wire splice, and wire harness

Patent metadata

Field	Value
Publication number	US-9692222-B2
Application number	US-201414765647-A
Country	US
Kind code	B2
Filing date	Oct 7, 2014
Priority date	Nov 6, 2013
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

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° C. to 128° 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° C. to 280° C.

First claim

The invention claimed is:

1. A heat-recoverable article having a cylindrical shape comprising a base material layer,
wherein the base material layer contains an antioxidant and two or more polyolefin resins;
wherein the base material layer has one melting-point peak temperature, and the melting-point peak temperature is 112° C. to 128° C.;
wherein 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° C. to 280° C.,
wherein, among the polyolefin resins, at least one polyolefin resin has a melting-point peak temperature of 112° C. or higher, and at least one other polyolefin resin has a melting-point peak temperature of lower than 112° C. or does not have a melting-point peak temperature, and
wherein the one other polyolefin resin is an ethylene-propylene copolymer elastomer, an ethylene-propylene rubber, or a polyethylene-based elastomer obtained by copolymerizing at least one of butene, hexene, and octene with ethylene.

2. The heat-recoverable article according to claim 1 , wherein the base material layer contains a flame retardant, and the heat of fusion of the base material layer is 60 to 85 J/g.

3. The heat-recoverable article according to claim 1 , further comprising an adhesive layer disposed on an inner peripheral surface of the base material layer.

4. The heat-recoverable article according to claim 3 , wherein the adhesive layer contains an ethylene-vinyl acetate copolymer or a polyamide.

5. The heat-recoverable article according to claim 3 , wherein the oxidation induction temperature of the adhesive layer is 255° C. or higher.

6. A wire splice comprising:
a plurality of wires, each including a conductor and an insulating layer provided on the outside thereof; and
a tube obtained by heat-shrinking the heat-recoverable article according to claim 1 made to adhere to a joint in which the conductors of the plurality of wites are connected to each other.

7. A wire harness comprising:
a plurality of wires, each including a conductor and an insulating layer provided on the outside thereof; and
a tube obtained by heat-shrinking the heat-recoverable article according to claim 1 made to adhere to the plurality of wires.

Assignees

• Sumitomo Electric Industries
• Sumitomo Electric Fine Polymer Inc

Inventors

• Yamasaki Satoshi
• Fukumoto Ryota
• Emoto Yasutaka

Classifications

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• H02G3/0462

  Tubings, i.e. having a closed section · CPC title

• H01B3/441

  from alkenes · CPC title

• H01B3/44

  vinyl resins; acrylic resins (silicones H01B3/46) · CPC title

• C08L2203/202

  use in electrical wires or wirecoating · CPC title