Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
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.
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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".
Kreuz John A.
Sutton, Jr. Richard F.
E. I. Du Pont de Nemours and Company
Hampton Hightower P.
Kight III John
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