FIELD: electrical engineering. SUBSTANCE: method involves loading of solvent (dimethylformamide or dimethyl- acetamide) and 4,4-diaminodiphenyl ester into reactor, stirring, loading of pyromellitic acid dianhydride, stirring, film pouring off, its cyclization and orientation. Dianhydride is loaded by two stages: 18,1 mas. p. at the first stage and 0,225-0,625 mas. p. at the second one. Polymethylphenylsiloxane liquid (0,20-3,52 mas. p. ) is loaded between these stages, and stirring is carried out at 15-25 C. EFFECT: improved method of polyimide film making. 1 tbl
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Authors
Dates
1994-02-15—Published
1991-06-06—Filed