LBT process of making high-tenacity polyethylene fiber
First Claim
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1. A process of producing a high-tenacity polyethylene fiber, comprising the steps of:
- mixing an ultrahigh-molecular-weight polyethylene exhibiting an intrinsic viscosity [η
A ] of at least 10 and a solvent with heating for dissolution, the weight ratio of the polyethylene to the solvent being in the range of 5;
95 to 50;
50;
extruding the mixture and cooling the extrudate to form a semi-finished fiber; and
stretching the semi-finished fiber at a ratio of at least 10 times to form a finished fiber exhibiting an intrinsic viscosity [η
B ] of at least 7 and having a tenacity of at least 30 g/d and an elastic modulus of at least 900 g/d, the intrinsic viscosities [η
A ] and [η
B ] complying with the following relationship;
space="preserve" listing-type="equation">0.7×
[η
.sub.A ]≦
[η
.sub.B ]≦
0.9×
[η
.sub.A ].
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Abstract
There is disclosed a high-tenacity polyethylene fiber containing an ethylene component as a main repeating unit, the fiber exhibiting an intrinsic viscosity [ηB ] of at least 7 and having a tenacity of at least 30 g/d and an elastic modulus of at least 900 g/d; the peak value of loss tangent in the γ-dispersion being 0.025 to 0.06 and the peak temperature of loss modulus in the α-dispersion being 85° C. or higher, as determined by measurement of temperature dispersion of viscoelastic properties of the fiber. Also disclosed is a process of producing such a high-tenacity polyethylene fiber.
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Citations
4 Claims
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1. A process of producing a high-tenacity polyethylene fiber, comprising the steps of:
-
mixing an ultrahigh-molecular-weight polyethylene exhibiting an intrinsic viscosity [η
A ] of at least 10 and a solvent with heating for dissolution, the weight ratio of the polyethylene to the solvent being in the range of 5;
95 to 50;
50;extruding the mixture and cooling the extrudate to form a semi-finished fiber; and stretching the semi-finished fiber at a ratio of at least 10 times to form a finished fiber exhibiting an intrinsic viscosity [η
B ] of at least 7 and having a tenacity of at least 30 g/d and an elastic modulus of at least 900 g/d, the intrinsic viscosities [η
A ] and [η
B ] complying with the following relationship;
space="preserve" listing-type="equation">0.7×
[η
.sub.A ]≦
[η
.sub.B ]≦
0.9×
[η
.sub.A ]. - View Dependent Claims (2, 3, 4)
-
Specification