Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1987-03-06
1989-10-17
Kight, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528188, 528229, 528353, C08G 6926
Patent
active
048748340
ABSTRACT:
A colorless transparent polyimide shaped article having as a main component at least one recurring unit selected from the recurring units of the formulae (I) to (III), which is useful, for example, as an oriented film in liquid crystal display devices. The polyimide shaped article is produced by a process which comprises preparing a solution of (A) a polyimide precursor obtained by reacting a diamino compound comprising as a main component at least one aromatic diamine having amino groups at the m-position selected from diamines of formulae (IV) to (VI) with a tetracarboxylic acid compound comprising as a main component a tetracarboxylic acid dianhydride of formula (VII) dissolved in (B) at least one organic polar solvent selected from N,N-dimethylacetamide, N,N-dimethylformamide, bis(2-methoxyethyl)ether, cresol and halogenated phenols; forming a shaped article of the polyimide precursor from the solution; and imidizing the resulting shaped article.
REFERENCES:
patent: 3234181 (1966-02-01), Olivier
patent: 3789048 (1974-01-01), Incremona
patent: 4429102 (1984-01-01), Evans et al.
Synthesis and Characterization of Essentially Colorless Polyimide Films: Anne K. St. Clair et al.
Evaluation of Colorless Polyimide Film For Thermal Control Coating Application (Jan. 1985): Anne K. St. Clair et al.
Higashi Kazumi
Noda Yuzuru
Kight John
Moore M. L.
Nitto Electric Industrial Co. Ltd.
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