Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Staple length fiber
Patent
1983-08-16
1985-04-16
Kendell, Lorraine T.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Staple length fiber
428364, 428397, 428399, D02G 300
Patent
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.
Son Tae W.
Yoon Han S.
Kendell Lorraine T.
Korea Advanced Institute of Science and Technology, 200-43
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