Title:
MULTILAYER FILM AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2022/024769
Kind Code:
A1
Abstract:
The present invention provides a multilayer film which is provided with a vinylidene fluoride resin-containing layer that has less waviness, while having excellent tensile properties. A multilayer film which is obtained by superposing, on one surface of a layer B that contains a vinylidene fluoride resin, a layer A in a removable manner, said layer A being composed of a thermoplastic resin film that has a dimensional change rate of 5% or less in the MD direction and a dimensional change rate of 3% or less in the TD direction after being left at rest at 120°C for 5 minutes as determined in accordance with JIS K7133 (1999). With respect to this multilayer film, the arithmetic mean height Sa1 of a 4.8 mm × 3.7 mm region of a surface of the layer B after separation of the layer A, said surface having been in contact with the layer A, is 80 nm or less as measured by means of a non-contact interferometric microscope in accordance with ISO 25178-604; and the nominal tensile strain at break is 100% or more at 25°C in both the MD direction and the TD direction if a tensile test is performed on the layer B after separation of the layer A in accordance with JIS K7127 (1999) (test piece type 2).
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Inventors:
NAGAOKA KOTA (JP)
YASUMOTO NORIAKI (JP)
TAKANO KEIJI (JP)
YASUMOTO NORIAKI (JP)
TAKANO KEIJI (JP)
Application Number:
PCT/JP2021/026511
Publication Date:
February 03, 2022
Filing Date:
July 14, 2021
Export Citation:
Assignee:
DENKA COMPANY LTD (JP)
International Classes:
B32B27/08; B32B7/022; B32B7/06; B32B27/18; B32B27/30
Domestic Patent References:
| WO2019059369A1 | 2019-03-28 | |||
| WO2016010013A1 | 2016-01-21 |
Foreign References:
| JP2005169935A | 2005-06-30 | |||
| JP2018043361A | 2018-03-22 | |||
| JP2010135349A | 2010-06-17 |
Attorney, Agent or Firm:
AXIS PATENT INTERNATIONAL (JP)
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