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Title:
POLYOLEFIN-BASED RESIN FILM, AND LAMINATE USING SAME
Document Type and Number:
WIPO Patent Application WO/2020/255642
Kind Code:
A1
Abstract:
Provided is a polyolefin-based resin film for a packaging bag obtained from a laminate with a substrate film having a large distortion of a molecular orientation axis such as a biaxially oriented polyamide-based resin film, wherein the packaging bag not only has excellent transparency, sealing properties, and bag-making properties, but also can be easily torn without generating wrinkles. The polyolefin-based resin film is composed of a polyolefin-based resin composition containing at least a propylene-α-olefin random copolymer, and satisfies 1) to 5) below. 1) The polyolefin-based resin composition contains 0-2 parts by weight of an olefin-based block copolymer with respect to 100 parts by weight of the propylene-α-olefin random copolymer. 2) The polyolefin-based resin composition contains 0-2 parts by weight of an olefin-based copolymer elastomer resin with respect to 100 parts by weight of the propylene-α-olefin random copolymer. 3) The polyolefin-based resin composition contains 0-40 parts by weight of a propylene homopolymer with respect to 100 parts by weight of the propylene-α-olefin random copolymer. 4) The polyolefin-based resin film has a heat shrinkage of 25% or less in one direction among the longitudinal direction and the width direction thereof, with a smaller heat shrinkage in the other direction, after being heated at 120°C for 30 minutes. 5) The polyolefin-based resin film has a plane orientation coefficient ΔP of 0.0100-0.0145 as calculated from the refractive index thereof.

Inventors:
TOMATSU WAKATO (JP)
NISHI TADASHI (JP)
Application Number:
PCT/JP2020/020688
Publication Date:
December 24, 2020
Filing Date:
May 26, 2020
Export Citation:
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Assignee:
TOYO BOSEKI (JP)
International Classes:
B29C55/06; B29C61/06; B32B27/32; B65D65/40; C08L23/00; C08L23/12; C08L23/14; C08L53/00; B29K23/00; B29L9/00
Domestic Patent References:
WO2019065306A12019-04-04
WO2017170244A12017-10-05
WO2019244708A12019-12-26
Foreign References:
JP2002003619A2002-01-09
JP5790497B22015-10-07
JPS5411935B21979-05-18
JP2016032911A2016-03-10
JP2018079583A2018-05-24
JP2014141302A2014-08-07
JP2000186159A2000-07-04
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