Polyamide acid, polyimide, optical film, display device and production methods thereof
AssigneeCentral Glass Company, Limited
InventorsHiroshi Eguchi, Ayumi Yamaguchi, Yukari Hara, Kei Matsunaga, Hiroto Hori, Yosuke Murakami, Kensuke Hirotaki, Kenji Hosoi
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Abstract
A polyimide which is obtained by a reaction of an aromatic diamine having a 1,1,1-trifluoro-2,2-ethanediyl group (—C(CF3)H—), as a linkage skeleton, with a tetracarboxylic dianhydride is easily dissolved in an organic solvent and exhibits excellent film forming properties. In addition, the thus-obtained polyimide can be used for an optical film and a display device.
Claims26
A polyimide having a repeating unit represented by General Formula [1], with the proviso that a polyimide having a repeating unit represented by General Formula [3] is excluded:
- wherein, in General Formula [1], R1 is a divalent organic group represented by General Formula [2], and R2 is a tetravalent organic group, and
- wherein, in General Formula [2], n is an integer of 1 to 4, and R3 each independently represents an alkyl group.
A polyamide acid having a repeating unit represented by General Formula [1A], with the proviso that a polyamide acid having a repeating unit represented by General Formula [3A] is excluded:
- wherein, in General Formula [1A], R1 is a divalent organic group represented by General Formula [2], and R2 is a tetravalent organic group, and
- wherein, in General Formula [2], n is an integer of 1 to 4, and R3 each independently represents an alkyl group.
A polyimide having a repeating unit represented by General Formula [1], with the proviso that a polyimide having a repeating unit represented by General Formula [3] is excluded:
- wherein, in General Formula [1], R1 is a divalent organic group represented by General Formula [2],
- and R2 is a tetravalent organic group selected from the following,
- wherein, in General Formula [2], n is an integer of 1 to 4, and R3 each independently represents an alkyl group.
Dependencies are inferred from the claim text.