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US 3,984,601 AGranted
Acrylonitrile polymer filaments
AssigneeE. I. Du Pont de Nemours and Company
InventorRobert Alan Blickenstaff
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AssigneeE. I. Du Pont de Nemours and Company
InventorRobert Alan Blickenstaff
Estimating the term…
Substantially single-phase compositions which are substantially partial or complete hydrates of an acrylonitrile polymer containing at least 40% acrylonitrile units can be shaped into filaments and films. The nitrile groups of the polymer are hydrated to a selected extent depending on the particular polymer used. Hydration occurs only within a certain elevated temperature range and under at least autogenous pressure. Also disclosed are films and filaments having novel structural features which are spun from the substantially single-phase compositions comprising polymers or copolymers of 80% or more acrylonitrile. The filaments are characterized by a sheath which has a density gradient in which the density increases toward the surface and, after drawing, by a unique luster source ratio related to reflective interfaces. Many of the filaments have surface striations and an optically microvoided core. The filaments contribute good hand and good water absorption properties to fabrics made therefrom.
A synthetic polymer filament of at least 80% by weight units of acrylonitrile and up to about 20% by weight units of one or more copolymerizable addition monomers and characterized by a Luster Source Ratio of at least about 0.7 and a striated sheath having substantially no optical voids but having a positive density gradient to the surface of the filament, said sheath having a thickness of between about 5% and about 50% of the distance from the outer surface of the filament to the central axis of the filament.
Dependencies are inferred from the claim text.