Title:
COMPOSITE FILM, LAYERED FILM, AND LAYERED PRODUCT USING SAME
Document Type and Number:
WIPO Patent Application WO/2022/234761
Kind Code:
A1
Abstract:
Provided are: a composite film having excellent low-temperature heat-sealing properties, excellent tight-sealing properties in conventional bags and at high filling speed, and excellent workability during layering of a function-imparting layer on a film surface; a layered film; and a layered product using same. This composite film comprises at least two layers, which are a base layer (A) and a heat-sealing layer (B). The base layer (A) is made of a resin composition obtained by mixing 100 parts by mass of a propylene random copolymer (a1) and 1-10 parts by mass of high-density polyethylene (a2) having a melt flow rate of less than 10 g/10 minutes at 190°C. The heat-seal layer (B) is made of a resin composition obtained by mixing 100 parts by mass of a propylene random copolymer (b1) with 1-20 parts by mass of high-density polyethylene (b2) having a melt flow rate of less than 10 g/10 minutes at 190°C. The resin composition has a melting point of 120°C or higher and an extrapolated melting initiation temperature (Tim) of 110°C or lower as measured by differential scanning calorimetry in accordance with JIS K 7121 (1987). This layered product uses the composite film.
Inventors:
YASUOKA RYO (JP)
MIYOSHI KATSUNORI (JP)
TOYOSHIMA YUTAKA (JP)
MURATA TAICHI (JP)
MIYOSHI KATSUNORI (JP)
TOYOSHIMA YUTAKA (JP)
MURATA TAICHI (JP)
Application Number:
PCT/JP2022/017339
Publication Date:
November 10, 2022
Filing Date:
April 08, 2022
Export Citation:
Assignee:
TORAY ADVANCED FILM CO LTD (JP)
International Classes:
B32B27/32; B32B7/022; B32B27/00; B65D65/40
Domestic Patent References:
| WO2021205812A1 | 2021-10-14 |
Foreign References:
| JP2002294216A | 2002-10-09 | |||
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| JP2004136565A | 2004-05-13 | |||
| JPH07304123A | 1995-11-21 | |||
| JP2009154332A | 2009-07-16 | |||
| JP2005059464A | 2005-03-10 | |||
| JPH09156021A | 1997-06-17 | |||
| JPH07310273A | 1995-11-28 | |||
| JPH1034846A | 1998-02-10 | |||
| US20120258307A1 | 2012-10-11 | |||
| CN103541745A | 2014-01-29 | |||
| CN103029389A | 2013-04-10 |
Attorney, Agent or Firm:
FUKUOKA, Mitsuru (JP)
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