Process for preparing fibers of soluble wholly aromatic polyamid

Details Process for preparing fibers of soluble wholly aromatic polyamid Process for preparing fibers of soluble wholly aromatic polyamid

1995-03-30

1997-07-01

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264203, 2642108, 26421115, 26421116, 264233, D01D 506, D01F 660

Patent

active

056435185

ABSTRACT:
Soluble wholly aromatic polyamide is obtained by low-temperature polycondensation in an amide solvent such as N-methyl-2-pyrrolidone. The reaction mixture is neutralized with an alkali and spun into fibers by wet spinning, coagulated in a salt-free aqueous solution of an organic solvent, preferably the polymerization solvent, and subsequently drawn in another aqueous solution of the same organic solvent, both solutions being substantially at ambient temperatures below 50.degree. C. but above freezing, More than 60% of the total fiber drawing is executed in this low-temperature draw stage.

REFERENCES:
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patent: 3414645 (1968-12-01), Morgan, Jr.
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patent: 3751546 (1973-08-01), Horolot
patent: 3869429 (1975-03-01), Blades
patent: 4073837 (1978-02-01), Kouzai et al.
patent: 4342715 (1982-08-01), Shimada et al.
patent: 4842796 (1989-06-01), Matsui et al.

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