Process for the production of polypropylene fibrids

Details Process for the production of polypropylene fibrids Process for the production of polypropylene fibrids

1979-05-07

1984-05-22

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

By extrusion spraying or gravity fall through orifice

264140, D21F 1100

Patent

active

044501250

ABSTRACT:
A process for the production of polypropylene fibrids of short length by abrupt expansion of a liquid mixture of molten polypropylene, an alkane solvent for the polypropylene, and a minor amount of a non-solvent for the polypropylene. The mixture, which is at a high temperature and high pressure, is ejected through an expansion orifice to instantaneously vaporize the alkane and to solidify the polypropylene.

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patent: 3914354 (1975-10-01), Ueki et al.
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patent: 4040856 (1977-08-01), Litzinger
patent: 4054625 (1977-10-01), Kozlowski et al.
patent: 4183881 (1980-01-01), Griffin et al.

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