Drawn gel-spun polyethylene yarns and process for drawing
First Claim
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1. A polyethylene multi-filament yarn comprising a polyethylene having an intrinsic viscosity in decalin at 135°
- C. of from about 5 dl/g to 35 dl/g, fewer than about two methyl groups per thousand carbon atoms, and less than about 2 wt. % of other constituents, said multi-filament yarn having a tenacity of at least 17 g/d as measured by ASTM D2256-02, wherein filaments of said yarn have a peak value of the ordered-sequence length distribution function, F(L), at a straight chain segment length L of at least 40 nanometers as determined at 23°
C. from the low frequency Raman band associated with the longitudinal acoustic mode (LAM-1), and the intensity of the (002) x-ray reflection of at least one said filament of said yarn shows two distinct peaks measured at room temperature under no external load.
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Abstract
Gel-spun multi-filament polyethylene yarns possessing a high degree of molecular and crystalline order, and to the drawing methods by which they are produced. The drawn yarns are useful in impact absorption and ballistic resistance for body armor, helmets, breast plates, helicopter seats, spall shields, and other applications; composite sports equipment such as kayaks, canoes, bicycles and boats; and in fishing line, sails, ropes, sutures and fabrics.
18 Citations
1 Claim
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1. A polyethylene multi-filament yarn comprising a polyethylene having an intrinsic viscosity in decalin at 135°
- C. of from about 5 dl/g to 35 dl/g, fewer than about two methyl groups per thousand carbon atoms, and less than about 2 wt. % of other constituents, said multi-filament yarn having a tenacity of at least 17 g/d as measured by ASTM D2256-02, wherein filaments of said yarn have a peak value of the ordered-sequence length distribution function, F(L), at a straight chain segment length L of at least 40 nanometers as determined at 23°
C. from the low frequency Raman band associated with the longitudinal acoustic mode (LAM-1), and the intensity of the (002) x-ray reflection of at least one said filament of said yarn shows two distinct peaks measured at room temperature under no external load.
- C. of from about 5 dl/g to 35 dl/g, fewer than about two methyl groups per thousand carbon atoms, and less than about 2 wt. % of other constituents, said multi-filament yarn having a tenacity of at least 17 g/d as measured by ASTM D2256-02, wherein filaments of said yarn have a peak value of the ordered-sequence length distribution function, F(L), at a straight chain segment length L of at least 40 nanometers as determined at 23°
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Current AssigneeHoneywell International Inc.
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Original AssigneeHoneywell International Inc.
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InventorsZhou, Qiang, Tam, Thomas Yiu-Tai, Tan, Chok B., Arnett, Charles R. Jr.
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Primary Examiner(s)EDWARDS, NEWTON O
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Application NumberUS11/205,939Publication NumberTime in Patent Office335 DaysField of Search428/364, 428/394, 428/357US Class Current428/394CPC Class CodesD01F 6/04 from polyolefinsY10T 428/29 Coated or structually defin...Y10T 428/2913 Rod, strand, filament or fiberY10T 428/2967 Synthetic resin or polymer
