Process for producing high strength polymetaphenylene isophthala

Details Process for producing high strength polymetaphenylene isophthala Process for producing high strength polymetaphenylene isophthala

1987-12-11

1989-06-27

Lorin, Hubert

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264203, 2642102, 2642107, 2642108, 26421115, 26421116, 264233, 2642103, D01F 660, D01D 512, D01D 1006

Patent

active

048427969

ABSTRACT:
A process is provided for preparing high strength polymetaphenylene isophthalamide fibers by the steps which include extruding a dope solution of a metaphenylene isophthalamide polymer in an organic solvent through a spinneret and into a coagulating liquid form in undrawn polymer filament; adjusting the content of the organic solvent; carrying out a first wet drawing in at least one aqueous wet drawing bath; making a second adjustment of the content of the organic solvent; carrying out a second wet drawing at a specified draw ratio in at least one aqueous wet drawing bath; drying the second wet drawn filament; and dry drawing the dried filament.

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