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Title:
BIAXIALLY ORIENTED POLYPROPYLENE FILM
Document Type and Number:
WIPO Patent Application WO/2020/137790
Kind Code:
A1
Abstract:
The present invention provides a biaxially oriented polypropylene film that has excellent heat resistance even at the high temperature of 150°C and high rigidity, easily maintains a bag shape when used as a packaging bag, and also exhibits little pitch displacement during printing and few wrinkles at a sealing portion when heat-sealed.　The storage modulus (E'-23) of this biaxially oriented polypropylene film at 23°C in a dynamic viscoelastic measurement is 2.0 GPa or more in the length direction and 6.0 GPa or more in the width direction, and the storage modulus (E'-80) at 80°C in a dynamic viscoelastic measurement is 1.0 GPa or more in the length direction and 3.0 GPa or more in the width direction. The ratio of E'-80 to E'-23 (E'-80/E'-23) is 0.4 or more in both the length direction and the width direction. The thermal shrinkage rate at 150°C is 10% or less in the length direction and 30% or less in the width direction, and the thermal shrinkage rate at 120°C is 2.0% or less in the length direction and 5.0% or less in the width direction. The thermal shrinkage rate at 120°C in the length direction is smaller than the thermal shrinkage rate at 120°C in the width direction.

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Inventors:
YAMADA KOUJI (JP)
HORINOUCHI KAZUHITO (JP)
NAKONO MAHIRO (JP)
IMAI TORU (JP)
Application Number:
PCT/JP2019/049807
Publication Date:
July 02, 2020
Filing Date:
December 19, 2019
Export Citation:
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Assignee:
TOYO BOSEKI (JP)
International Classes:
B29C55/12; C08J5/18; B29K23/00; B29L7/00
Domestic Patent References:
WO2017221781A12017-12-28
WO2015012324A12015-01-29
WO2016182003A12016-11-17
Foreign References:
JP2017226161A2017-12-28
JP2016188361A2016-11-04
JP2006117956A2006-05-11
JP2017500226A2017-01-05
JP2018130958A2018-08-23
JP2013177645A2013-09-09
Other References:
ZAMBELLI ET AL., MACROMOLECULES, vol. 6, 1973, pages 925
See also references of EP 3904052A4
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