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Method of preparation of powders of thermotropic polymer by extrusion, granulation - - grinding, the granules thus, by grinding, these powders and the fine and free-flowing powders obtained.
Method of preparation of powders of thermotropic polymer by extrusion, granulation - - grinding, the granules thus, by grinding, these powders and the fine and free-flowing powders obtained.
The present invention relates to a process for the preparation of novel finely divided and free-flowing powders of thermotropic polymers which are capable of forming anisotropic melts. & br / this method is implemented in chaining extrusion, granulation and grinding known to those skilled in the art, but by choosing the special conditions of temperature in the driving of the extrusion operation according to which the molten polymer to a temperature t1 is greater than the melting temperature tm (to which appears the liquid crystal phase) is cooled before its entry into the die to a temperature t2 lower than level tf. & br / the present invention also relates to compact granules and the fine powders formed of spherical particles, made from thermotropic polymers, and the fine structure is nonfibrillar. & br / fine powders obtained are particularly suitable for applications such as the electrostatic coating or in a fluidized bed.
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