Title:
BIAXIALLY ORIENTED POLYPROPYLENE FILM
Document Type and Number:
WIPO Patent Application WO/2020/137793
Kind Code:
A1
Abstract:
Provided is a biaxially oriented polypropylene film which has high rigidity, has excellent heat resistance even at the high temperature of 150˚C, can easily retain a bag shape when used as a packaging bag, exhibits little pitch shift during printing and few wrinkles in seal parts when heat sealing has been performed thereon. The relationship between the loop stiffness stress (S[mN]) and the thickness (t[µm]) of the biaxially oriented polypropylene film satisfies the following formula in the length direction thereof, S≥0.00020×t3, and the following formula in the width direction thereof, S≥0.0010×t3. The biaxially oriented polypropylene film has a heat shrinkage at 150˚C of at most 10% in the length direction thereof and at most 30% in the width direction thereof, and has a heat shrinkage at 120˚C of at most 2.0% in the length direction thereof and at most 5.0% in the width direction thereof. The heat shrinkage at 120˚C in the length direction thereof is smaller than the heat shrinkage at 120˚C in the width direction thereof.
Inventors:
YAMADA KOUJI (JP)
HORINOUCHI KAZUHITO (JP)
NAKONO MAHIRO (JP)
IMAI TORU (JP)
HORINOUCHI KAZUHITO (JP)
NAKONO MAHIRO (JP)
IMAI TORU (JP)
Application Number:
PCT/JP2019/049810
Publication Date:
July 02, 2020
Filing Date:
December 19, 2019
Export Citation:
Assignee:
TOYO BOSEKI (JP)
International Classes:
B29C55/12; C08J5/18; B29K23/00; B29L7/00
Domestic Patent References:
| WO2017221781A1 | 2017-12-28 | |||
| WO2015012324A1 | 2015-01-29 | |||
| WO2016182003A1 | 2016-11-17 |
Foreign References:
| JP2017226161A | 2017-12-28 | |||
| JP2015178615A | 2015-10-08 | |||
| JP2017500226A | 2017-01-05 | |||
| JP2018130958A | 2018-08-23 | |||
| JP2013177645A | 2013-09-09 |
Other References:
ZAMBELLI ET AL., MACROMOLECULES, vol. 6, 1973, pages 925
See also references of EP 3904053A4
See also references of EP 3904053A4
Download PDF:
Previous Patent: BIAXIALLY ORIENTED POLYPROPYLENE FILM
Next Patent: BIAXIALLY-ORIENTED POLYPROPYLENE FILM
Next Patent: BIAXIALLY-ORIENTED POLYPROPYLENE FILM