Process for producing high-strength, ultralow denier polybenzimi

Details Process for producing high-strength, ultralow denier polybenzimi Process for producing high-strength, ultralow denier polybenzimi

1979-04-23

1981-04-21

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264203, 2642104, 2642106, 2642107, 2642108, D01D 512

Patent

active

042632455

ABSTRACT:
An improved process for the production of ultralow denier, high-strength polybenzimidazole filaments is provided. A solution of the polymer is extruded vertically downward through a plurality of extrusion orifices into a gaseous atmosphere before being passed through a liquid coagulation bath. During their passage from the extrusion orifices to the exit from the coagulation bath, the filaments are drawn at an initial draw ratio of approximately 2:1 to 50:1. After being passed through the coagulaton bath, the filaments are washed, dried, and heat drawn at a heat draw ratio of approximately 1.5:1 to 10:1. The resulting filaments, having a denier per filament of approximately 0.05 to 0.50 and a tenacity of at least 4 grams per denier, are collected.

REFERENCES:
patent: 3079219 (1963-02-01), King
patent: 3414645 (1968-12-01), Morgan
patent: 3441640 (1969-04-01), Santangelo
patent: 3584104 (1971-06-01), Bohrer et al.
patent: 3619453 (1971-11-01), Riggs
patent: 3642706 (1972-02-01), Morgan
patent: 3816581 (1974-06-01), Prince
patent: 3836621 (1974-09-01), Prince
patent: 3851025 (1974-11-01), Ram
patent: 4020142 (1977-04-01), Davis et al.

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