Title:
STRETCHED POLYPROPYLENE FILM
Document Type and Number:
WIPO Patent Application WO/2023/063142
Kind Code:
A1
Abstract:
[Problem] To provide a stretched polypropylene film that has improved rigidity but also has favorable stretchability, heat resistance, and dimensional stability and can contribute to streamlining production during secondary processing. [Solution] According to the present invention, a laminate film has a substrate layer that is formed from at least two different types of resin mixtures formed by mixing a propylene/α-olefin random copolymer (B) into a polypropylene resin (A) that has a mesopentad fraction of at least 95% such that there is 1–10 weight% of the propylene/α-olefin random copolymer (B) relative to 100 weight% of the resin mixture. When the laminate film is heated from 30°C to 150°C at 5°C/min under a load of 0.32 N, the rate of dimensional change (140°C) in the MD direction is no more than 30%, and, as measured by dynamic mechanical analysis at a heating speed of 3°C/min and a frequency of 1.0 Hz, the storage elastic modulus (120°C) of the laminate film in the TD direction is at least 600 MPa, and the storage elastic modulus (140°C) in the TD direction is at least 300 MPa.
Inventors:
OKUMURA ATSUSHI (JP)
Application Number:
PCT/JP2022/036951
Publication Date:
April 20, 2023
Filing Date:
October 03, 2022
Export Citation:
Assignee:
FUTAMURA KAGAKU KK (JP)
International Classes:
B32B27/32; B29C55/02; C08L23/12; C08L23/14
Domestic Patent References:
| WO2006057361A1 | 2006-06-01 | |||
| WO2021256348A1 | 2021-12-23 |
Foreign References:
| JP2019163358A | 2019-09-26 | |||
| JP2005280173A | 2005-10-13 |
Attorney, Agent or Firm:
KATO Hiroki (JP)
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