Para-aromatic polyamide yarn having low filament linear density

Details Para-aromatic polyamide yarn having low filament linear density Para-aromatic polyamide yarn having low filament linear density

1997-08-05

1999-03-16

Edwards, Newton

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

428395, D02G 300

Patent

active

058827919

ABSTRACT:
A p-aramid microfilament yarn and a process for manufacturing the same. In the p-aramid yarn, which has a yarn linear density of at least 300 dtex, comprising a bundle of filaments with a linear density of less than 0.8 dtex, the g value is higher than 2.5 GPa, the elongation (EAB) is higher than 3.4%, and the L002 value is higher than 350 .ANG.. More particularly, the filament linear density is 0.3 to 0.8. The yarn according to the invention has surprisingly favorable properties, such as a high internal shear modulus. The invention also pertains to a process for manufacturing such a microfilament yarn in which p-aramid is subjected to an air gap-wet spinning process of the known type, in which the draw ratio in the air gap combined with the diameter of the capillaries through which the polymer is extruded ensures that microfilament yarn having the desired properties is obtained.

REFERENCES:
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patent: 4850050 (1989-07-01), Droste et al.
Baltussen, "Delft Technical University", Tensile deformation of polymer fibers, p. 8 (1996).
Jawad, et al., "Journal of Materials Science", The transverse compression of oriented nylon and polyethylene extrudates, 13, pp. 1381-1387 (1978).
Kiya-Oglu, et al., "VNIIPV, Mytishchi, Translated from Khimicheskie Volokna", Effect of Spinning Conditions on the Stationary Regime Region in Stretching a Jet of a Solution of Poly-P-Phenyleneterephthalamide in an Air Gap, 2, pp. 86-89 (1993).
Northolt, et al., "Polymer", Elastic extensiosn of an oriented crystalline fibre, 26, pp. 310-316 (1985).
International Search Report dated Aug. 9, 1996.

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