Process for the obtaining of poly(vinylidene fluorine) yarns and

Details Process for the obtaining of poly(vinylidene fluorine) yarns and Process for the obtaining of poly(vinylidene fluorine) yarns and

1974-05-30

1976-06-22

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264210F, 264290R, C08F11400, D01F 600

Patent

active

039652327

ABSTRACT:
A process of making polyvinylidene fluoride yarns and fibers of homogeneous structure and good dry strength includes the steps of spinning the solution of the polymer into a coagulating bath containing 45 to 60% by weight aprotic polar organic solvent and 40 to 55% by weight water, stretching the filaments in air to a ratio of 1.5 to 5x and then in boiling water to a ratio of 1.5 to 4x (overall stretching ratio of 3x to 6.5x) and then washing in water at room temperature.

REFERENCES:
patent: 2405008 (1946-07-01), Berry
patent: 2824780 (1958-02-01), Satterthwaite
patent: 2846727 (1958-08-01), Bechtold
patent: 2953818 (1960-09-01), Bartron
patent: 3081208 (1963-03-01), Bottorf et al.
patent: 3139470 (1964-06-01), Prengle et al.
patent: 3197538 (1965-07-01), Capron et al.
patent: 3376370 (1968-04-01), Koblitz et al.
patent: 3751531 (1973-08-01), Foster et al.

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