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AssigneeFina Technology, Inc.
InventorsDarek Wachowicz, Cyril Chevillard, Lisa K. Albe
Estimating the term…
A fiber product drawn from an isotactic propylene copolymer of a C2, C4, C5, C6, C7 or C8 α-olefin monomer produced in the presence of a metallocene catalyst characterized by a bridged chiral and stereorigid cyclopentadienyl or substituted cyclopentadienyl ligand structure of a transitional metal selected from group 4b, 5b, or 6b metals of the Periodic Table of Elements, the copolymer having a MFR less than 35, suitably about 30 or less. The copolymer is heated to a molten state and extruded to form a fiber preform. The preform is subjected to spinning at a spinning speed of at least 300 meters per minutes and subsequent drawing at a speed of up to about 1500 meters per minute to provide a draw ratio of at least 1.5 up to 5:1 to produce a continuous fiber having high tenacity of about 3.5 grams per denier and greater and good hand.
An elongated fiber product comprising a drawn isotactic random copolymer of propylene and at least one {acute over (α)}-olefin selected from the group consisting of ethylene, C4-C8 {acute over (α)}-olefins, 1,3 butadiene, isoprene, styrene, fluoroethylene, and vinyl chloride, wherein said {acute over (α)}-olefin is present in said copolymer in the range of from about 0.2 to about 10 mole percent based on the total moles of propylene and said {acute over (α)}-olefin in said copolymer, said copolymer having a MFR less than 35 dg/min at 230° C., said copolymer being copolymerize in the presence of a catalyst system comprising a bridged chiral and stereorigid cyclopentadienyl or substituted cyclopentadienyl ligand structure of a transitional metal selected from group 4b, 5b, and 6b metals of the Periodic Table of Elements, said elongated fiber being prepared by drawing a melt spun preform at a draw speed of less than 2000 meters per minute and a draw ratio of at least 1.5:1 and further characterized by having a tenacity of about 3.5 grams per denier and greater.
A process of producing an elongated fiber of an isotactic random copolymer of propylene and at least one {acute over (α)}-olefin selected from the group consisting of ethylene, C4-C8 {acute over (α)}-olefins, 1,3 butadiene, isoprene, styrene, fluoroethylene, and vinyl chloride, wherein said {acute over (α)}-olefin is present in said copolymer in the range of from about 0.2 to about 10 mole percent based on the total moles of propylene and said {acute over (α)}-olefin in said copolymer, said copolymer having a MFR less than 35 dg/min at 230° C., said copolymer being copolymerized in the presence of a catalyst system comprising a bridged chiral and stereorigid cyclopentadienyl or substituted cyclopentadienyl ligand structure of a transitional metal selected from group 4b, 5b, or 6b metals of the Periodic Table of Elements, comprising:
The process of clam 27 in which said draw ratio is in the range from 1.5:1 to 2.5:1.
Dependencies are inferred from the claim text.