Process for preparing poly(tetramethylene terephthalate) yarn

Details Process for preparing poly(tetramethylene terephthalate) yarn Process for preparing poly(tetramethylene terephthalate) yarn

1974-04-19

1976-08-17

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264290T, D01D 512

Patent

active

039754880

ABSTRACT:
There is provided a process for preparing yarn comprised of at least 83 percent (by weight) of poly(tetramethylene) terephthalate with a spun denier per filament of from about 0.6 to about 50 from a polymer with a relative viscosity of from about 10 to about 50. In said process filaments of said polymer are extruded through a spinnerette at a spinning temperature of from about 240 to about 280 degrees centigrade, and the extruded filaments are taken up at a windup speed of from about 1000 to about 10,000 feet per minute; during said extrusion, the spinning threadline tension per extruded filament (as measured about 70 inches from the face of the spinnerette) is at least 0.09 grams per filament. Thereafter the extruded filaments are drawn in one or more stages to a draw ratio of from about 1.0 to about 5.0 and, during the drawing step, the filaments are passed over a heated object at a temperature of from about 60 to about 180 degrees centigrade.

REFERENCES:
patent: 2465319 (1949-07-01), Whinfield et al.
patent: 3361859 (1968-01-01), Cengato
patent: 3553305 (1971-01-01), Bu
patent: 3715421 (1973-02-01), Martin et al.
patent: 3822334 (1974-07-01), Patterson et al.

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