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AssigneeDsm IP Assets B.V.
InventorsJoseph Arnold Paul Maria Simmelink, Jacobus Johannes Mencke, Martinus Johannes Nicolaas Jacobs, Roeloef Marissen
Estimating the term…
Processes for making high-performance polyethylene multi-filament yarn are disclosed which include the steps of a) making a solution of ultra-high molar mass polyethylene in a solvent; b) spinning of the solution through a spinplate containing at least 5 spinholes into an air-gap to form fluid filaments, while applying a draw ratio DRfluid; c) cooling the fluid filaments to form solvent-containing gel filaments; d) removing at least partly the solvent from the filaments; and e) drawing the filaments in at least one step before, during and/or after said solvent removing, while applying a draw ratio DRsolid of at least 4, wherein in step b) each spinhole comprises a contraction zone of specific dimension and a downstream zone of diameter Dn and length Dn with Ln/Dn of from 0 to at most 25, to result in a draw ratio DRfluid=DRsp*DRag of at least 150, wherein DRsp is the draw ratio in the spinholes and DRag is the draw ratio in the air-gap, with DRsp being greater than 1 and DRag at least 1. High-performance polyethylene multifilament yarn, and semi-finished or end-use products containing said yarn, especially to ropes and ballistic-resistant composites, are also disclosed.
High-performance polyethylene multifilament yarn made from linear ultra-high molar mass polyethylene of IV 8-40 dL/g as measured on decalin solutions at 135° C., with total enthalpy of non-reversible transitions as measured by temperature-modulated differential scanning calorimetry (TMDSC) of at least 200 J/g.
High-performance polyethylene multifilament yarn made from linear ultra-high molar mass polyethylene of IV 8-40 dl/g as measured on decalin solutions at 135° C., characterized by a peak in the non-reversible TMDSC curve with a maximum at about 152° C. as measured by TMDSC having an enthalpy of at least 35 J/g.
Dependencies are inferred from the claim text.