Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1984-03-07
1985-08-13
Lieberman, Allan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524173, 524233, 528229, 528310, C08K 534, C08K 541, C08K 520, C08L 7908
Patent
active
045351058
ABSTRACT:
An aromatic polyamic acid solution composition useful as an electrically insulating varnish, comprises (1) an aromatic polyamic acid which is a polymerization product of (A) a tetracarboxylic acid component containing at least 80 molar % of the sum of (a) a first acid ingredient consisting of 3,3',4,4'-biphenyltetracarboxylic dianhydride and (b) a second acid ingredient consisting of at least one member selected from the group consisting of pyromellitic dianhydride, and 3,3'4,4'-benzophenone tetracarboxylic dianhydride, the molar ratio of the first acid ingredient to the second acid ingredient being in the range of from 30:70 to 75:25, with (B) an amine component consisting of at least one aromatic amine in a molar ratio of the tetracarboxylic acid component to the amine component of from 97:100 to 103:100, and which polymeric acid has a logarithmic viscosity number of from 0.1 to 1.5 determined in a concentration of 0.5 g/100 ml in N-methyl-2-pyrrolidone at a temperature of 30.degree. C., and dissolved in a concentration of from 5% to 40% by weight in (2) an organic polar solvent.
REFERENCES:
patent: 4358581 (1982-11-01), Sutton, Jr.
patent: 4405770 (1983-09-01), Schoenberg et al.
patent: 4454276 (1984-06-01), Uda et al.
Inaike Toshihiro
Oh-e Shunji
Otsuka Kazunori
Yamamoto Shuji
Lieberman Allan M.
Ube Industries Ltd.
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