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A melt-spun fibers from with metallocenes catalyzed random propylene - alpha - olefin - copolymers
A melt-spun fibers from with metallocenes catalyzed random propylene - alpha - olefin - copolymers
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机译:茂金属熔纺纤维催化的无规丙烯-α-烯烃-共聚物。
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摘要
A fiber product drawn from an isotactic propylene copolymer of a C2, C4, C5, C6, C7 or C8 &agr;-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.
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