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出願の表示

1. EP3279237 - POLYIMIDE FILM, POLYIMIDE VARNISH, PRODUCT USING POLYIMIDE FILM, AND LAMINATE

注意: このテキストは、OCR 処理によってテキスト化されたものです。法的な用途には PDF 版をご利用ください。

[ EN ]
Claims

1. A polyimide film containing:

a polyimide expressed by following general formula (1); and

a structure expressed by following general formula (A-1), and at least one or more of structures respectively expressed by following general formula (A-2), following general formula (A-3) and following general formula (A-4), as A in the general formula (1).

Herein, in the general formula (1), A represents a bivalent organic group, B represents a tetravalent organic group, and n is 2 or more.



In the general formula (A-2), X represents a bivalent organic group selected from following general formulas (X-1) to (X-3).









In the general formula (A-3), a is 0 or 1.


  2. The polyimide film according to claim 1, wherein as A in the general formula (1), the film contains the structure expressed by the general formula (A-1) and a structure expressed by following general formula (A-5).


  3. The polyimide film according to claim 2, wherein a ratio (structure expressed by the general formula (A-1) /structure expressed by the general formula (A-5)) between the structure expressed by the general formula (A-1) and the structure expressed by the general formula (A-5)) is in a range of 2/8 to 6/4 on a molar basis.
  4. The polyimide film according to any one of claims 1 to 3, wherein as B in the general formula (1), the film contains at least one of structures respectively expressed by from following general formula (B-1) to general formula (B-4).

In the general formula (B-1), Y represents one of structures selected from following general formula (Y-1) to general formula (Y-3).














  5. The polyimide film according to any one of claims 1 to 4, wherein as B in the general formula (1), the film contains a structure expressed by following general formula (B-5).


  6. A polyimide film containing:

a polyimide expressed by following general formula (1); and

a structure expressed by following general formula (A-1) as A in the general formula (1),

wherein retardation (Rth) is 50 nm or less in a conversion value into a film thickness of 15 µm, elongation of the film is 10% or more, and coefficients of thermal expansion α1, α2 meet the following equation (I).

α1: Coefficient of thermal expansion below a glass transition temperature or less of the film in first measurement

α2: Coefficient of thermal expansion below the glass transition temperature or less of the film in second measurement

Herein, in the general formula (1), A represents a bivalent organic group, B represents a tetravalent organic group, and n is 2 or more.


  7. The polyimide film according to any one of claims 1 to 6, wherein a film thickness of the film ranges from 1 µm to 5 µm.
  8. The polyimide film according to any one of claims 1 to 7, wherein a weight average molecular weight (Mw) of the polyimide is 30,000 or more.
  9. The polyimide film according to any one of claims 1 to 8, wherein a Yellow Index (YI) is 5.0 or less.
  10. The polyimide film according to any one of claims 1 to 9, wherein a content of γ-butyrolactone is smaller than 3 mass%.
  11. A polyimide varnish obtained by dissolving or dispersing a polyimide expressed by following general formula (1) in a solvent, wherein A in the general formula (1) contains a structure expressed by following general formula (A-1) and a structure expressed by following general formula (A-5), a ratio (structure expressed by the general formula (A-1)/structure expressed by the general formula (A-5)) is in a range of 2/8 to 6/4 on a molar basis, and B expressed by the general formula (1) contains a structure expressed by following general formula (B-5).

Herein, in the general formula (1), A represents a bivalent organic group, B represents a tetravalent organic group, and n is 2 or more.






  12. A product using the polyimide film according to any one of claims 1 to 10.
  13. A layered product having the polyimide film according to any one of claims 1 to 10, and a transparent electrode layer.
  14. The layered product according to claim 13, wherein the product has at least one or more layers of the transparent electrode layer on each of both surfaces of the polyimide film.