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Title:
COLORLESS MULTILAYER POLYIMIDE FILM, LAMINATE BODY, AND FLEXIBLE ELECTRONIC DEVICE MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2022/102450
Kind Code:
A1
Abstract:
The present invention provides a colorless polyimide film which has a high tensile strength at break and a high tensile modulus of elasticity, while having a high elongation at break and a low linear expansion coefficient.　This multilayer film uses a polyimide, to which less than 0.05 mass% of an inorganic filler is added, as an outer layer (a), and a polyimide, to which 1-35 mass% of an inorganic filler is added, as an inner layer (b). This multilayer polyimide film is obtained by applying a polyimide solution or polyimide precursor solution for forming the layer (a) to a provisional support, drying the solution until the solvent content reaches 5-40 mass%, subsequently applying a polyimide solution or polyimide precursor solution for forming the layer (b) to the provisional support, repeating the application in the same manner as necessary, and finally carrying out a heat treatment. A white film is obtained if an inorganic filler having a high refractive index is used for the inner layer, while a colorless transparent film is obtained if an inorganic filler having a refractive index that is close to the refractive index of a polyimide resin is used.

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Inventors:
MIZUGUCHI DENICHIROU (JP)
OKUYAMA TETSUO (JP)
WAKUI HIROYUKI (JP)
NAKAMURA MAKOTO (JP)
WATANABE NAOKI (JP)
YONEMUSHI HARUMI (JP)
MAEDA SATOSHI (JP)
YOKOYAMA MASAYUKI (JP)
Application Number:
PCT/JP2021/040229
Publication Date:
May 19, 2022
Filing Date:
November 01, 2021
Export Citation:
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Assignee:
TOYO BOSEKI (JP)
International Classes:
B32B9/00; B32B7/023; B32B7/027; B32B9/04; B32B27/20; B32B27/34; C08G73/10; C08J5/18; C08J7/04; C08K3/013; C08K3/36; C08L79/08; H05K1/03
Domestic Patent References:
WO2018186262A12018-10-11
WO2014051050A12014-04-03
WO2009019968A12009-02-12
Foreign References:
JP2010208312A2010-09-24
JPH11106650A1999-04-20
JP2020125485A2020-08-20
JP2015110332A2015-06-18
JP2008044230A2008-02-28
JP2015199360A2015-11-12
JPH0528458A1993-02-05
JP2017170728A2017-09-28
JPS63297038A1988-12-05
JP2018500211A2018-01-11
JPH08230124A1996-09-10
US20100035066A12010-02-11
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