Solution spinning process for producing a polyethylene terephtha

Details Solution spinning process for producing a polyethylene terephtha Solution spinning process for producing a polyethylene terephtha

1989-09-07

1991-10-29

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264203, 264205, 2642107, 2642108, 26421115, 26421116, D01F 662

Patent

active

050614258

ABSTRACT:
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 1.0 dl/g and wherein the organic solvent is selected from 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 product the high modulus, high tenacity polyethylene terephthalate filament.

REFERENCES:
patent: 2497376 (1950-02-01), Swallow et al.

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