COMPOSITE FILM, COVER MATERIAL, AND COVERED CONTAINER WITH CONTENT

WIPO Patent Application WO/2022/264815

A1

The present invention provides: a composite film that enables a cover material, which is capable of forming an open hole in a partial peeling off part before being fully opened, to suppress the occurrence of defects such as breakage and hole residue at the time of peeling off for the formation of an open hole, while achieving a peel strength that enables reliable peeling off; a cover material which is formed of this composite film; and a covered container with content. A composite film for forming a cover material according to the present invention has a specific configuration that comprises an easily releasable resin layer and polyester films which are arranged on both surfaces of the easily releasable resin layer. Specifically, the present invention provides a composite film 1 which sequentially comprises a first polyester film layer 8a, an easily releasable resin layer 10 and a second polyester film layer 8b in this order, wherein: the both surfaces of the first polyester film layer 8a are not subjected to a corona treatment; at least a surface of the second polyester film layer 8b, the surface being in contact with the easily releasable resin layer 10, is subjected to a corona treatment; and the components and the composition of the easily releasable resin layer are set within specific ranges.

SHINJI SAYURI (JP)
AZAMI KEISUKE (JP)
KOIZUMI SHINICHI (JP)
TANIKAWA RYOJI (JP)

PCT/JP2022/022345

December 22, 2022

June 01, 2022

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KYODO PRINTING CO LTD (JP)

B32B27/00; B32B1/02; B32B27/32; B32B27/36; B65D65/40; B65D81/34

WO2012073274A1

2012-06-07

JP2017132532A	2017-08-03
JP2014125263A	2014-07-07
JP2007320582A	2007-12-13
JP2007320580A	2007-12-13

AOKI, Atsushi et al. (JP)

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