FIELD: organic chemistry. SUBSTANCE: a process for preparing low viscous polyamidoacid solutions in polar solvents suitable for use as electroinsulating varnishes. This is achieved by carrying out condensation of dianhydrides of aromatic tetracarboxylic acids and aromatic diamines at 10-25 C till the dianhydride is completely dissolved and the polymer solution is then heated to 75-100 C and kept for 0.5-1.5 hr. EFFECT: greater efficiency of the process. 1 tbl
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Authors
Dates
1995-01-09—Published
1992-06-30—Filed