Title:
POLYIMIDE FILM AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/102451
Kind Code:
A1
Abstract:
The present invention can obtain, without any trouble such as warpage, a film having a well-balanced combination of properties, which are colorlessness and transparency, practically sufficient film strength, high elongation at break, and low coefficient of linear expansion, by forming two polyimide ingredients as respective independent layers to perform allocation of functions and regulating the film-thickness ratio between the two layers to a value within a certain range. This film is a two-layer film composed of a high-strength polyimide as an inner layer (a) and a polyimide with excellent optical properties as an outer layer (b). Polyimide or polyimide-precursor solutions for constituting the two layers are applied to a temporary support and heat-treated to form said imide film. The two layers are combined so that one of the two layers is far thinner than the other, thereby making it possible to obtain a film which is free from warpage and is colorless and transparent.
Inventors:
NAKAMURA MAKOTO (JP)
YONEMUSHI HARUMI (JP)
OKUYAMA TETSUO (JP)
WAKUI HIROYUKI (JP)
MIZUGUCHI DENICHIROU (JP)
WATANABE NAOKI (JP)
MAEDA SATOSHI (JP)
YONEMUSHI HARUMI (JP)
OKUYAMA TETSUO (JP)
WAKUI HIROYUKI (JP)
MIZUGUCHI DENICHIROU (JP)
WATANABE NAOKI (JP)
MAEDA SATOSHI (JP)
Application Number:
PCT/JP2021/040230
Publication Date:
May 19, 2022
Filing Date:
November 01, 2021
Export Citation:
Assignee:
TOYO BOSEKI (JP)
International Classes:
C08J5/18; B32B27/34; C08G73/10; C08J7/04; H05K1/03
Domestic Patent References:
| WO2016129329A1 | 2016-08-18 | |||
| WO2018186262A1 | 2018-10-11 | |||
| WO2020262450A1 | 2020-12-30 |
Foreign References:
| JP2019515819A | 2019-06-13 |
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