Process for the production of finely divided and free-flowing po

Details Process for the production of finely divided and free-flowing po Process for the production of finely divided and free-flowing po

1990-11-13

1992-03-31

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

To form particulate product

264 406, B29C 4786

Patent

active

051006057

ABSTRACT:
Finely divided and free-flowing powders of a thermotropic polymer, e.g., a wholly aromatic polyester or a wholly aromatic polyesteramide, are produced by (a) extruding a melt of such thermotropic polymer through an extrusion apparatus including a downstream die member to provide at least one solid cylindrical profile thereof, during which extrusion (i) the molten thermotropic polymer is at a temperature T.sub.1 greater than the melting temperature T.sub.M thereof at which the liquid crystal phase develops, while (ii) cooling such molten thermotropic polymer no later than the instant of its inlet entry into the die member to a temperature T.sub.2 ranging from a value 7.degree. C. less than the temperature T.sub.M to a minimum value equal to the crystallization temperature T.sub.c thereof, and (iii) maintaining this temperature T.sub.2 of the molten thermo-tropic polymer during extrusion thereof through the die member, and then (b) granulating and grinding the at least one solid cylindrical profile thus provided.

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