C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 73/10 (2006.01) B29C 41/24 (2006.01) B29C 41/46 (2006.01) H01L 23/14 (2006.01) H05K 1/03 (2006.01)
Patent
CA 2057398
PE-0194 TITLE TETRAPOLYIMIDE FILM CONTAINING BENZOPHENONE TETRACARBOXYLIC DIANHYDRIDE ABSTRACT OF THE DISCLOSURE Tetrapolyimide films derived from 3,3',4,4'-benzo- phenone tetracarboxylic dianhydride, pyromellitic acid dianhydride, p-phenylene diamine and 4,4'-diamino- diphenyl ether, and their preparation, are described. The tetrapolymer films have low water absorption, low coefficients of thermal and hygroscopic expansion, high modulus and are caustic etchable and can be used in flexible printed circuit and tape automated bonding applications.
Kreuz John A.
Milligan Stuart N.
Sutton Richard F. Jr.
E. I. Du Pont de Nemours And Company
Kreuz John A.
Milligan Stuart N.
Sim & Mcburney
Sutton Richard F. Jr.
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