Cellular fibers via soluble fluid injection

Details Cellular fibers via soluble fluid injection Cellular fibers via soluble fluid injection

1986-05-06

1988-03-01

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264211, 2642106, 2642108, 26421112, 521 60, 521 79, 521 98, D01F 102

Patent

active

047284722

ABSTRACT:
A fiber having 1/2-50% substantially gas-filled and essentially all closed cells having a diameter of 0.2-25 microns and a length to diameter ratio of greater than 500 is disclosed. The fiber is made by mixing a fluorocarbon blowing agent into molten polymer, shearing the polymer at a high shear rate, extruding the polymer in a spinneret capillary at a low jet velocity and a low capillary entrance pressure and drawing down the polymer at a total extension greater than 1000.

REFERENCES:
patent: 3095258 (1963-06-01), Scott
patent: 3214234 (1965-10-01), Bottomley
patent: 3329557 (1967-07-01), Magat et al.
patent: 4164603 (1979-08-01), Siggel et al.
patent: 4380594 (1983-04-01), Siggel et al.
patent: 4544594 (1985-10-01), Li et al.
patent: 4562022 (1985-12-01), Li et al.

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