Process for preparing new polyester filaments

Details Process for preparing new polyester filaments Process for preparing new polyester filaments

1978-10-05

1980-03-25

Phynes, Lucille M.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642102, B28B 320, D01D 512, D01F 1100

Patent

active

041950518

ABSTRACT:
Poly(ethylene terephthalate) filaments of enhanced dyeability, low boil-off shrinkage (even in as-spun condition), good thermal stability over a large temperature range; and useful as texturing feed yarns and/or as hard yarns requiring no further drawing are prepared by spinning at extremely high speeds, and are characterized by a long period spacing above 300 A in their as-spun condition, and, whether in as-spun condition or after heat-treatment, by a low skin-core value as measured by a differential birefringence in relation to their stress measured at 20% extension (which correlates approximately with the spinning speed), a large crystal size, and low amorphous orientation. The continuous filament yarns may be draw-textured to provide textured yarns which also show enhanced dyeability. The staple fiber yarns also have very useful properties as compared with conventional staple yarns. A preferred process of spinning at these extremely high speeds is characterized by the use of a spinneret with capillary-dimensions that produce high shear as the polyester is extruded, and is applicable also to copolyesters, whose filaments show a similar low skin-core in relation to their stress at 20% extension, the precise values for copolymers being different from the relationship for poly(ethylene terephthalate).

REFERENCES:
patent: 2604667 (1952-07-01), Hebeler
patent: 3216187 (1965-11-01), Chantry et al.
patent: 3707593 (1972-12-01), Fukada et al.
patent: 3739056 (1973-06-01), Evans et al.
patent: 3772872 (1973-11-01), Piazza et al.
patent: 3789031 (1974-01-01), Buttner et al.
patent: 3963678 (1976-06-01), Conrad et al.
patent: 4025592 (1977-05-01), Bosley et al.

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