Copolyimide film with improved properties

Details Copolyimide film with improved properties Copolyimide film with improved properties

1990-04-30

1992-11-24

Kight, III, John

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528126, 528128, 528170, 528172, 528173, 528176, 528183, 528220, 528229, 528350, 528351, 528353, C08G 6926, C08G 1400, C08G 6300

Patent

active

051663082

ABSTRACT:
Disclosed is an aromatic copolyimide film prepared by chemical conversion of a copolyamide acid solution obtained by copolymerization of an aromatic tetracarboxylic acid component comprising from 30 to 50 mole % of biphenyltetracarboxylic acid dianhydride, 50 to 70 mole % of pyromellitic acid dianhydride, 60 to 80 mole % of p-phenylenediamine and 20 to 40 mole % of 4,4'-diaminodiphenyl ether. The aromatic copolyimide film has a low coefficient of thermal expansion, low water absorption, a low coefficient of hygroscopic expansion, high mechanical strength and is readily etchable making it suitable for use an advanced electronic substrate.

REFERENCES:
patent: 4239880 (1980-12-01), Darms
patent: 4680195 (1987-07-01), Pfeifer
patent: 4778872 (1988-10-01), Sasaki et al.
patent: 4783372 (1988-11-01), Pfeifer
patent: 5003030 (1991-03-01), Hayashi et al.
CA99(12):89229w "Accelerated Chemical etching of Kapton polyimide films", Hawkins et al., C. M. (E. I. Du Pont de Nemours (O), Proc. Tech. Program-Annu. Int. Electron. Packag. Conference 2nd 1982, 653-62 (Eng.).
The Condensed Chemical Dictionary, 7th ed. p. 746 "beta-picoline".

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