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AssigneeStamicarbon B.V.
InventorsPaul Smith, Pieter J. Lemstra, Robert Kirschbaum, Jacques P. L. Pijpers
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An improved process for the preparation of polymer filaments having a high tensile strength and modulus by spinning a solution of high-molecular weight polymer and thereafter stretching the filament thus formed. A solution of an ethylene polymer or copolymer, containing at least 80 percent by weight solvent, is spun at a temperature above the gel point of the solution. The ethylene polymer or copolymer contains at most about 5 percent by weight of an alkene having 3 to 8 carbon atoms, has a weight-average molecular weight Mw higher than 4.times.10.sup.5 kg/kmole, and has a weight/number average molecular weight ratio Mw/Mn lower than 5. The spun polymer solution is thereafter cooled to a temperature below its gel point to form a gel filament, which gel filament is thereafter stretched to form a polymer filament having a tensile strength of at least about 1.5 GPa at room temperature.
An improved process for the preparation of polyethylene filaments having a high tensile strength and modulus by spinning a solution of linear high-molecular weight polyethylene and thereafter stretching the filament thus formed, the improvement essentially comprising:
An improved process for the preparation of polymer filaments having a high tensile strength and modulus by spinning a solution of high-molecular weight polymer and stretching the gel filament thus formed, the improvement essentially comprising spinning a solution of a linear polymer or copolymer capable of forming a polymer or copolymer gel, said polymer or copolymer solution containing at least 80 percent by weight solvent relative to said solution, at a temperature above the gel point of said solution, cooling the spun polymer solution thus formed to a temperature below its gel point to form a gel filament, and stretching said gel filament while simultaneously twisting said filament around its axis, under conditions such that a polymer filament having a tensile strength of at least 1.5 GPa at room temperature is formed.
Dependencies are inferred from the claim text.