Process for producing highly oriented undrawn polyester fibers
AssigneeToray Industries, Inc.
InventorsTakashi Ochi, Akira Kishiro, Mototada Fukuhara, Atsushi Taniguchi, Takeshi Kikutani
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Abstract
A process for preparing highly oriented undrawn core-sheath type conjugated polyester fibers including the step of spinning a polyester as the sheath polymer and a polymer having a larger gradient of elongational viscosity with the temperature than that of the sheath polymer as a core polymer at a spinning speed of about 4000 to 12000 m/min.
Claims8
A process for preparing highly oriented undrawn core-sheath type conjugated polyester fibers, comprising:
- spinning a polyester as a sheath polymer and a polymer having a larger gradient of elongational viscosity with the temperature than that of the sheath polymer as a core polymer at a spinning speed of about 4000 to 12000 m/min, to form undrawn core-sheath type fibers.
A process for preparing highly oriented undrawn core-sheath type conjugated polyester fibers, comprising:
- spinning a polyester as a sheath polymer and a polymer having a larger gradient of elongational viscosity with the temperature than that of the sheath polymer as a core polymer at a spinning speed of about 4000 to 12000 m/min, wherein the fibers are crystalline such that the fibers exhibit diffraction peaks observable in a wide angle X-ray diffraction peak image of the fibers and have a birefringence of about 0.015 to 0.05.
A process for preparing highly oriented undrawn core-sheath type conjugated polyester fibers, comprising:
- spinning a polyester as a sheath polymer and a polymer having a larger gradient of elongational viscosity with the temperature than that of the sheath polymer as a core polymer at a spinning speed of about 4000 to 12000 m/min, wherein the fibers are crystalline such that the fibers exhibit diffraction peaks observable in a wide angle x-ray diffraction peak image of the fibers and have a birefringence of about 0.015 to 0.05, and wherein the boil off shrinkage of the fibers obtained is about 10 to 50%.
Dependencies are inferred from the claim text.