MULTILAYER HEAT SHRINKABLE FILM AND WRAPPED BATTERY

Title:

MULTILAYER HEAT SHRINKABLE FILM AND WRAPPED BATTERY

Document Type and Number:

WIPO Patent Application WO/2005/110746

Kind Code:

A1

Abstract:

[PROBLEMS] Disclosed is a heat shrinkable film having excellent heat resistance, content resistance, impact resistance, low/high temperature cycle resistance and wear resistance. [MEANS FOR SOLVING PROBLEMS] Specifically disclosed is a heat shrinkable film comprising an intermediate layer (1), a front surface layer (2) and a back surface layer (3) so arranged as to sandwich the intermediate layer (1), and a overcoat layer (4) arranged on top of the front surface layer (2). The intermediate layer (1) contains a first cyclic olefin resin and a random copolymer of ethylene and another &agr -olefin or a random copolymer of propylene and another &agr -olefin. The front surface layer (2) and the back surface layer (3) respectively contain a second cyclic olefin resin and a linear low density polyethylene resin. Such a multilayer heat shrinkable film is formed into a tubular shape in such a manner that the overcoat layer (4) is on the outside. A secondary battery is fitted into the thus-formed tube of the multilayer heat shrinkable film and the tube is heat shrunk, so that there is obtained a wrapped battery.

Inventors:

WAKAI MUTSUMI (JP)
OKUDA TOMOHISA (JP)
MORIKAWA AKIRA (JP)

Application Number:

PCT/JP2005/008776

Publication Date:

November 24, 2005

Filing Date:

May 13, 2005

Export Citation:

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Assignee:

GUNZE KK (JP)
WAKAI MUTSUMI (JP)
OKUDA TOMOHISA (JP)
MORIKAWA AKIRA (JP)

International Classes:

B29C61/00; B32B1/08; B32B27/32; H01M50/121; H01M50/129; B29C63/42; (IPC1-7): B32B27/32; B32B1/08; H01M2/02

Domestic Patent References:

WO2004110750A1

2004-12-23

Foreign References:

JP2004170468A	2004-06-17
JP2002052632A	2002-02-19
JPH10237234A	1998-09-08

Other References: