ULTRA-HIGH MOLECULAR WEIGHT POLYETHYLENE POLYMERS HAVING IMPROVED PROCESSABILITY AND MORPOLOGY
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United States of America Patent
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Issued Date -
Oct 5, 2023
app pub date -
Aug 30, 2021
filing date -
Aug 30, 2021
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Abstract
An ultra-high molecular weight polyethylene polymer has: a powder bulk density of at least 200 kg/m3; an intrinsic viscosity (I.V.) of at least 8 dl/g, as measured in accordance with ASTM D4020; and wherein, a specimen prepared from the ultra-high molecular weight polyethylene can be drawn in the absence of a solvent, at a total draw ratio of at least 50, when drawing at a drawing temperature of ≥Tm−30° C., wherein Tm is the melting temperature of the ultra-high molecular weight polyethylene polymer. A supported catalyst system for producing such UHMWPE polymers includes a transition metal complex and a particulate catalyst support including particles having a volume based median particle diameter of at least 0.3 micrometer. Articles derived from such polymers having excellent strength and modulus.
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