Cellulosic fibers from anisotropic solutions
AssigneeE. I. Du Pont de Nemours and Company
InventorJohn P. O'Brien
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Abstract
High strength, high modulus cellulose triacetate fibers are produced by spinning a 30-42% by weight solution of cellulose triacetate having an acetyl content of at least 42.5% and an inherent viscosity of at least 5 from a solvent mixture comprising trifluoroacetic acid and another solvent having a molecular weight of less than 160 in a mol ratio of 0.3-3.0 through an air gap into a coagulating bath. The fibers are optionally heat treated under tension or saponified to provide high strength high modulus regenerated cellulose fibers.
Claims6
Cellulose triacetate fibers having at least 42.5% by weight acetyl groups, an inherent viscosity in hexafluoroisopropanol at 0.5 g/dl of at least 5, a tenacity of at least 10 dN/tex, an orientation angle of 35.degree. or less, an AACS value of at least 130 and an exotherm in their DSC scan in the range between 190.degree. and 240.degree. C.
Cellulose triacetate fibers having at least 42.5% by weight acetyl groups, an inherent viscosity in hexafluoroisopropanol at 0.5 g/dl of at least 5, a tenacity of at least 10.6 dN/tex, a modulus of at least 155 dN/tex, and an orientation angle of 20.degree. or less.
Regenerated cellulose fibers having a tenacity of at least 12.4 dN/tex and a modulus of at least 220 dN/tex, and an orientation angle of 18.degree. or less.
Dependencies are inferred from the claim text.