Process of making poly(trimethylene arylate) fibers
AssigneeE. I. Du Pont de Nemours and Company
InventorW. Douglas Bates
Life of this patent
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Abstract
A fine denier poly(trimethylene arylate) spun drawn fiber is characterized by high denier uniformity. A process for preparing uniform fine denier yarns at spinning speeds of 4000 to 6000 m/min is further disclosed. The poly(trimethylene arylate) fiber hereof comprises 0.1 to 3% by weight of polystyrene dispersed therewithin. Fabrics prepared therefrom are also disclosed.
Claims7
A process comprising extruding a polymer melt comprising 0.1 to 3% by weight, based on the total weight of polymer, of polystyrene dispersed in poly(trimethylene arylate), through an orifice forming a continuous filamentary extrudate, quenching the extrudate to solidify it into a continuous filament, wrapping the continuous filament around a first driven roll heated to a temperature in the range of 70 to 100° C. and rotating at a first rotational speed, followed by wrapping the filament around a second driven roll heated to a temperature in the range of 100 to 130° C. and rotating at a second rotational speed wherein the ratio of the second rotational speed to the first rotational speed lies in the range of 1.75 to 3;
- and, thereby forming a spun drawn filament having a denier of ≦3, a denier coefficient of variation of ≦3%, and a birefringence of ≧0.055.
Dependencies are inferred from the claim text.