Process of making high tenacity, high modulus UHMWPE fiber
First Claim
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1. A process for producing an ultra-high molecular weight polyethylene (UHMW PE) multi-filament yarn having a tenacity of at least 45 g/denier, wherein said yarn is fabricated from an UHMW PE polymer having an intrinsic viscosity of at least about 21 dl/g and a yarn intrinsic viscosity that exceeds 90% relative to the intrinsic viscosity of the UHMW PE polymer;
- wherein said intrinsic viscosities are measured in decalin at 135°
C. according to ASTM D1601-99, the process comprising;
a) providing a mixture comprising an UHMW PE polymer and a spinning solvent, said UHMW PE polymer having an intrinsic viscosity of at least about 21 dl/g as measured in decalin at 135°
C. according to ASTM D1601-99;
b) forming a solution from said mixture;
c) passing the solution through a spinneret to form a plurality of solution filaments;
d) cooling the solution filaments to a temperature below the gel point of the UHMW PE polymer to thereby form a gel yarn;
e) removing the spinning solvent from the gel yarn to form a dry yarn; and
f) stretching at least one of the solution filaments, the gel filaments and the solid filaments in one or more stages to form a yarn product having a tenacity of greater than 45 g/d, and wherein said yarn product has an intrinsic viscosity that exceeds 90% relative to the intrinsic viscosity of the UHMW PE polymer;
wherein said intrinsic viscosities are measured in decalin at 135°
C. according to ASTM D1601-99.
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Abstract
Processes for preparing ultra-high molecular weight polyethylene (“UHMW PE”) filaments and multi-filament yarns, and the yarns and articles produced therefrom. Each process produces UHMW PE yarns having tenacities of 45 g/denier to 60 g/denier or more at commercially viable throughput rates.
46 Citations
18 Claims
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1. A process for producing an ultra-high molecular weight polyethylene (UHMW PE) multi-filament yarn having a tenacity of at least 45 g/denier, wherein said yarn is fabricated from an UHMW PE polymer having an intrinsic viscosity of at least about 21 dl/g and a yarn intrinsic viscosity that exceeds 90% relative to the intrinsic viscosity of the UHMW PE polymer;
- wherein said intrinsic viscosities are measured in decalin at 135°
C. according to ASTM D1601-99, the process comprising;a) providing a mixture comprising an UHMW PE polymer and a spinning solvent, said UHMW PE polymer having an intrinsic viscosity of at least about 21 dl/g as measured in decalin at 135°
C. according to ASTM D1601-99;b) forming a solution from said mixture; c) passing the solution through a spinneret to form a plurality of solution filaments; d) cooling the solution filaments to a temperature below the gel point of the UHMW PE polymer to thereby form a gel yarn; e) removing the spinning solvent from the gel yarn to form a dry yarn; and f) stretching at least one of the solution filaments, the gel filaments and the solid filaments in one or more stages to form a yarn product having a tenacity of greater than 45 g/d, and wherein said yarn product has an intrinsic viscosity that exceeds 90% relative to the intrinsic viscosity of the UHMW PE polymer;
wherein said intrinsic viscosities are measured in decalin at 135°
C. according to ASTM D1601-99. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 18)
- wherein said intrinsic viscosities are measured in decalin at 135°
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9. A process for producing an ultra-high molecular weight polyethylene (UHMW PE) multi-filament yarn, comprising:
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a) providing a mixture comprising a UHMW PE polymer and a spinning solvent, wherein the UHMW PE polymer is present in said mixture in an amount of less than 5.0% by weight based on the weight of the solvent plus the weight of the UHMW PE polymer; b) forming a solution from said mixture; c) passing the solution through a spinneret to form a plurality of solution filaments; d) cooling the solution filaments to a temperature below the gel point of the UHMW PE polymer to thereby form a gel yarn; e) removing the spinning solvent from the gel yarn to form a dry yarn; and f) stretching at least one of the solution filaments, the gel filaments and the solid filaments in one or more stages to form a yarn product. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification