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

Patent metadata

Field	Value
Publication number	US-9393755-B2
Application number	US-201514890479-A
Country	US
Kind code	B2
Filing date	Mar 24, 2015
Priority date	Mar 31, 2014
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

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 ( 1 ) according to the present invention includes a cylindrical base material layer ( 10 ), and an adhesive layer ( 11 ) formed on an inner circumferential surface of the base material layer. The adhesive layer ( 11 ) 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 ( 11 ) at 150° C. is 300 Pa·s or more at a shear rate of 0.01 s −1 and 200 Pa·s or less at a shear rate of 100 s −1 . The wire splice and the wire harness according to the present invention includes a tube formed by thermally shrinking the multilayered heat-recoverable article ( 1 ).

First claim

The invention claimed is:

1. A multilayered heat-recoverable article comprising a cylindrical base material layer; and an adhesive layer formed on an inner circumferential surface of the base material layer,
wherein 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, and
a shear viscosity of the adhesive layer at 150° C. is 300 Pa·s or more at a shear rate of 0.01 s −1 and 200 Pa·s or less at a shear rate of 100 s −1 .

2. The multilayered heat-recoverable article according to claim 1 , wherein the resin composition contains a very low-density polyethylene in an amount of 20% by mass or more.

3. The multilayered heat-recoverable article according to claim 1 , wherein the resin composition contains an ethylene copolymer in an amount of 20% by mass or more.

4. A wire splice comprising a plurality of wires each of which includes a conductor and an insulating layer formed on the outside of the conductor; and
a tube adhering to a portion where the conductors of the wires are connected to each other,
wherein the tube is formed by thermally shrinking the multilayered heat-recoverable according to claim 1 .

5. A wire harness comprising a plurality of wires each of which includes a conductor and an insulating layer formed on the outside of the conductor; and
a tube adhering to the wires,
wherein the tube is formed by thermally shrinking the multilayered heat-recoverable article according to claim 1 .

6. A method for producing an adhesive for a multilayered heat-recoverable article, the adhesive being formed of a resin composition that contains a polyamide as a main component and that does not substantially contain an inorganic filler, the method comprising:
a step of irradiating the resin composition with ionizing radiation,
wherein a dose of the ionizing radiation is controlled so that a shear viscosity of the adhesive at 150° C. is 300 Pa·s or more at a shear rate of 0.01 s −1 and 200 Pa·s or less at a shear rate of 100 s −1 .

7. The method for producing an adhesive for a multilayered heat-recoverable article according to claim 6 , wherein the dose of the ionizing radiation absorbed by the resin composition is 90 kJ/kg or more.

8. The method for producing an adhesive for a multilayered heat-recoverable article according to claim 6 , wherein the ionizing radiation is an electron beam.

Assignees

• Sumitomo Electric Industries
• Sumitomo Elec Fine Polymer Inc

Inventors

• Fukumoto Ryota
• Yamasaki Satoshi
• Emoto Yasutaka

Classifications

• B32B27/16

  specially treated, e.g. irradiated · CPC title

• B32B2270/00

  Resin or rubber layer containing a blend of at least two different polymers · CPC title

• H01B3/305

  Polyamides or polyesteramides · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B27/34

  comprising polyamides · CPC title