METHOD OF MANUFACTURING THREAD FROM AROMATIC HETEROCYCLIC POLYAMIDE Russian patent published in 2006 - IPC D01F6/60 D01F6/74 D01F6/76 D01F11/04 

FIELD: optionally materials.

SUBSTANCE: invention relates to heat-resistant thread manufacture technology and can be utilized in manufacture of special materials for flak jackets, high-pressure containers, and in airplane construction. Thread is made from aromatic heterocyclic polyamide prepared via low-temperature polycondensation of a mixture composed of 25-70 mol % diamine of formula: , where X represents -NH, -S, -O, -N(CH₃), and N(C₂H₅) and Z represents N or C, and 30-75 mol % of p-phenylenediamine with aromatic dicarboxylic acid chloride used in equimolar proportions in organic solvent and in presence of lithium or calcium chloride. Thus prepared solution is molded into water-dimethylacetamide precipitation bath. Thread is rinsed, dried, thermally treated for 10-30 min at 340-360°C, and then is drawn at 230-270°C at heating time 1-3 sec.

EFFECT: improved performance characteristics of thread.

1 tbl, 7 ex