Solution spinning process

Details Solution spinning process Solution spinning process

1988-09-12

1990-11-06

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264203, 2642107, 2642108, 26421115, 26421116, D01F 662, D01D 506

Patent

active

049684710

ABSTRACT:
This invention discloses a process for producing a high modulus, high tenacity polyethylene terephthalate filament which comprises (1) spinning a solution of polyethylene terephthalate in an organic solvent through a die to produce a solution spun filament, wherein the polyethylene terephthalate has an intrinsic viscosity of at least about 3.0 dl/g and wherein the organic solvent is selected form the group consisting of (a) hexafluoroisopropanol, (b) trifluoroacetic acid, (c) mixed solvent systems containing from about 20 weight percent to about 99 weight percent hexafluoroisopropanol and from about 1 weight percent to about 80 weight percent dichloromethane, and (d) mixed solvent systems containing from about 20 weight percent to about 99 weight percent trifluoroacetic acid and from about 1 to about 80 weight percent dichloromethane; and (2) subsequently drawing the solution spun filament to a total draw ratio of at least about 7:1 to produce the high modulus, high tenacity polyethylene terephthalate filament. The filaments made by the process of this invention have better thermal stability, such as a lower thermal shrinkage and a higher melting point, than fibers made utilizing standard melt processing techniques.

REFERENCES:
patent: 2743250 (1956-04-01), Sweet et al.
patent: 4003974 (1977-01-01), Chantry et al.
patent: 4413110 (1983-11-01), Kavesh et al.
patent: 4755587 (1988-07-01), Rinehart
patent: 4792573 (1988-12-01), Cohn

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