Polyamic acid solution composition and polymide film made theref

Details Polyamic acid solution composition and polymide film made theref Polyamic acid solution composition and polymide film made theref

1985-11-04

1988-10-18

Kight, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528183, 528185, 528187, 528229, 5283291, 528353, 525436, C08G 6936, C08L 7706

Patent

active

047788720

ABSTRACT:
Disclosed is an aromatic polyamic acid solution composition comprising an aromatic polyamic acid dissolved in an amount of 5 to 40% by weight in an organic polar solvent. The aromatic polyamic acid is prepared by polymerizing substantially equimolar amounts of an aromatic tetracarboxylic acid component comprising 15 to 85 mole % of a biphenyltetracarboxylic acid or its functional derivative and 15 to 85 mole % of a pyromellitic acid or its functional derivative and an aromatic diamine component comprising 30 to 100 mole % of a phenylenediamine and 0 to 70 mole % of a diaminodiphenyl ether. The aromatic polyamic acid solution composition is formed into an aromatic polyimide film having a relatively small thermal expansion coefficient, high mechanical strength and good flexibility.

REFERENCES:
patent: 3316212 (1967-04-01), Angelo et al.
patent: 4485140 (1984-11-01), Gannett et al.
patent: 4485234 (1984-11-01), Makino et al.

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