FIELD: chemistry.
SUBSTANCE: described is a method of producing ultra-high molecular weight polyamide fibres, particularly nylon, where the fibres have very high relative viscosity. The method involves a melt-phase polymerisation procedure which is optionally carried out in combination with a solid-phase polymerisation procedure. The procedures are carried out while observing selected controlled conditions, which enable to obtain polyamide fibres with denier from about 2 to about 100 (from about 2.2 dtex to about 111 dtex), having relative viscosity greater than about 200.
EFFECT: producing high molecular weight fibres having breaking and wear strength, and chemical resistance for industrial use.
18 cl, 3 dwg, 1 tbl
