Process of forming synthetic fibers

Details Process of forming synthetic fibers Process of forming synthetic fibers

1974-07-29

1976-10-19

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

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

To form particulate product

162157R, 162164R, 260 296WQ, 260 75T, 260 75S, 264 13, 526308, 526346, 526348, B29C 600, B22D 2308

Patent

active

039871398

ABSTRACT:
A process of preparing polymer fibers by adiabatically flashing an emulsion or dispersion of water or other suitable nonsolvent in molten polymer, the emulsion or dispersion including an emulsifying agent and a dispersing aid, at an elevated temperature and pressure through a narrow orifice into a region of reduced temperature and pressure. The water or other nonsolvent is present in an amount effective, in combination with the temperature and pressure employed, to cause the molten polymer to be disrupted and rapidly solidify in the form of high surface area, i.e., at least 1.0 m.sup.2 /gram, discrete fibers. The polymer is preferably a crystalline polymer. The nonsolvent employed should have a boiling point less than the melting point of the polymer, a critical temperature greater than the melting point of the polymer, a heat of vaporization greater than the heat of fusion of the polymer, and is substantially immiscible in the polymer at the temperature of flashing.

REFERENCES:
patent: 2728753 (1955-12-01), Russum et al.
patent: 3674736 (1972-07-01), Lerman et al.
patent: 3703502 (1972-11-01), Venderbos et al.
patent: 3730918 (1973-05-01), Teti et al.
patent: 3770856 (1973-11-01), Ueki et al.
patent: 3774387 (1973-11-01), Woodell
patent: 3808091 (1974-04-01), Aoki et al.
patent: 3848027 (1974-11-01), Forbess et al.
patent: 3885014 (1975-05-01), Fukada et al.

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