Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1997-09-24
1999-06-01
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
2642108, D01D 516, D01F 606
Patent
active
059085940
ABSTRACT:
Process for the production of polypropylene fibers from polypropylene polymers produced by the polymerization of polypropylene in the presence of a metallocene catalyst characterized by a bridged racemic bis(indenyl) ligand substituted at the proximal position. The polypropylene contains 0.5 to 2% 2,1 insertions and has an isotacticity of at least 95% meso diads and 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 500 meters per minutes and subsequent drawing at a speed of at least 1,500 meters per minute to provide a draw ratio of at least 3 to produce a continuous polypropylene fiber. The draw speed and/or the draw ratio can be varied to produce fibers of different mechanical properties. Different polypropylene polymers produced by different metallocene catalysts can be used. Such fibers can be characterized by having an elongation at break of at least 100% and a specific toughness of at least 0.5 grams per denier.
REFERENCES:
patent: 4298718 (1981-11-01), Mayr et al.
patent: 4544717 (1985-10-01), Mayr et al.
patent: 4560734 (1985-12-01), Fujishita et al.
patent: 4701432 (1987-10-01), Welborn, Jr.
patent: 4794096 (1988-12-01), Ewen
patent: 4808561 (1989-02-01), Welborn, Jr.
patent: 4892851 (1990-01-01), Ewen et al.
patent: 4975403 (1990-12-01), Ewen
patent: 5242876 (1993-09-01), Shamshoum et al.
patent: 5243002 (1993-09-01), Razavi
patent: 5272003 (1993-12-01), Peacock
patent: 5308811 (1994-05-01), Suga et al.
patent: 5318735 (1994-06-01), Kozulla
patent: 5444134 (1995-08-01), Matsumoto
Gownder Mohan R.
Nguyen Jay
Zamora Eduardo E.
Cheairs M. Norwood
Fina Technology, Inc.
Jackson William D.
Tentoni Leo B.
Wheelington Jimmy D.
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