Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1995-10-05
1998-02-17
Yoon, Tae
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528183, 528188, 528351, 528353, C08G 7310, C08K 517
Patent
active
057192537
ABSTRACT:
This invention provides a poly(amic acid) solution which does not contain aprotic polar solvents such as DMF, NMP, DMAc, DMSO, as well as a polyimide film obtained therefrom having appropriate flexibility and a small coefficient of linear thermal expansion and a coated material in which the polyimide film is formed on a substrate.
More particularly, it provides a poly(amic acid) solution which has an aromatic poly(amic acid) and a tertiary amine as the solute and a water soluble alcohol compound and/or a water soluble ether compound as the solvent and contains substantially no aprotic polar solvent, as well as a polyimide film obtained from the poly(amic acid) solution and a coated material obtained by forming the film on a substrate.
REFERENCES:
patent: 5070181 (1991-12-01), Kawai et al.
patent: 5241041 (1993-08-01), Choi et al.
patent: 5300619 (1994-04-01), Okada et al.
patent: 5466732 (1995-11-01), Tomioka et al.
Echigo Yoshiaki
Iwaya Yoshiaki
Okamoto Shoji
Tomioka Isao
Yamada Hiroshi
Unitika Ltd.
Yoon Tae
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