Highly oriented aromatic polyamide short fiber

Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Staple length fiber

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428364, 428397, 428399, D02G 300

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active

045116237

ABSTRACT:
High oriented poly(p-phenylenetetraphthalamide) short fibers having an inherent viscosity of at least 5.0 and a dimension of 2-12 .mu.m in diameter and 1000-5000 .mu.m in length are provided. These fibers have a physical form of irregular cross-sections and needle point-like ends similar to those of natural wood pulp fibers, and crystalline properties such as a crystallinity of more then 50%, an orientation angle of less than 25.degree. and an apparent crystallite size of more that 50 .ANG. as determined from an X-ray diffractogram scan, and a cross-section with four extinction positions through 360.degree. rotation when observed under a polarizing microscope. These fibers are prepared, without spinning steps, by subjecting the molecular chains of poly(p-phenyleneterephthalamide) to mechanical parallelization during the growth of the chains in a polymerization system therefor containing a pyridine/amide-based solvent.

REFERENCES:
patent: 3133138 (1964-05-01), Alexander, Jr.
patent: 3671542 (1972-06-01), Kwolek et al.
patent: 3869430 (1975-03-01), Blades
patent: 4048429 (1977-09-01), Vandenberg
patent: 4162346 (1979-07-01), Jones, Jr. et al.
"Riegel's Handbook of Industrial Chemistry", 8th Edition, Van Nostrand Reinhold Company (1983) pp. 404 through 406.

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