FIELD: machine building.
SUBSTANCE: procedure consists in poly-condensation of three aromatic diamines with dianhydride of tetra-carbonic acid in a-proton polar solvent of equimolar amount. 2,5-bis(aminophenyl)pyrimidine, and paraphenylendiamine are used as diamines, while the third aromatic diamine is chosen from a row containing meta-phenylendiamine, 2,4-bis(aminophenyl)pyrimidine at their molar ratio 50:49:1 - 50:35:15 correspondingly.
EFFECT: fibres produced by wet moulding and subjected to fibre thermal cyclisation possess high durability and thermal resistance.
2 tbl, 8 ex
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