Monofilament made of poly(p-phenylene terephthalamide) and process for producing such a monofilament

摘要

Monofilament 20 made of poly(p-phenylene terephthalamide), characterised in that the following relationships exist: 1.7 /= 170-D/3; Mi >/= 2000; and in that it has a different crystalline structure at the core and at the surface, C being the count in tex, D being the diameter in mu m, T being the tenacity in cN/tex and Mi being the initial modulus in cN/tex for this monofilament. Process which makes it possible to obtain this monofilament 20 in which a solution 2 of poly(p-phenylene terephthalamide) is extruded in a die 9, the jet is drawn into a noncoagulating liquid layer 13 and the drawn liquid jet is introduced into a coagulating medium 19. Assemblages of such monofilaments. Articles reinforced by these monofilaments or these assemblages, such articles being, for example, tyre casings.