Process for producing wholly aromatic polyamide fibers

Details Process for producing wholly aromatic polyamide fibers Process for producing wholly aromatic polyamide fibers

1975-08-26

1978-02-14

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Recycling of reclaimed or purified process material

Of gaseous process material

264178F, 264179, 264184, 264210F, D01F 700

Patent

active

040738370

ABSTRACT:
A process for producing wholly aromatic polyamide fibers by extruding a spinning solution of a wholly aromatic polyamide in an amide solvent into an aqueous coagulating bath containing inorganic salts, said process comprising feeding an aqueous coagulating liquid containing calcium chloride and having an amide solvent concentration of not more than 3% by weight to the vicinity of a spinneret, flowing the coagulating liquid in said bath at an average velocity not more than 0.1 time the velocity of yarn take-up in the yarn advancing direction, discharging the coagulating liquid having an amide solvent concentration of not less than 4% by weight from said bath, treating the coagulating bath with an organic solvent consisting substantially of methylene chloride, and extracting and recovering the amide solvent from the coagulating liquid.

REFERENCES:
patent: 3079219 (1963-02-01), King
patent: 3084384 (1963-04-01), Denyes et al.
patent: 3086050 (1963-04-01), Nofarbartolo et al.
patent: 3414645 (1968-12-01), Morgan
patent: 3532677 (1970-10-01), Baron
patent: 3751546 (1973-08-01), Horoldt et al.
patent: 3787372 (1974-01-01), Blocker
patent: 3944522 (1976-03-01), Tohyama et al.

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