Process for the preparation of profiles based on¹thermotropic polymer by extrusion and the industrially¹usable profiles obtained

摘要

Process for the manufacture of profiles suitable for a subsequent industrial use, from thermotropic polymers which are capable of forming anisotropic melts. This process is carried out by performing an extrusion operation which is known to a person skilled in the art, but by choosing particular temperature conditions according to which the molten polymer at a temperature T1 higher than the melting temperature TM (at which the liquid crystal phase appears) is cooled before it enters the die at a temperature T2 lower than TM. The present invention also relates to profiles made from thermotropic polymers and whose close structure is nonfibrillar. The profiles obtained can be, in particular, granulated and then ground to produce fine and pourable powders which are suitable, for example, for electrostatic coating.