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US 11,981,757 B2Granted
Injection molded medical devices made from a high molecular weight polyethylene
AssigneeCelanese International Corporation
InventorsChristina Schmid, Rainer Walkenhorst
Life of this patent
Estimating the term…
Abstract
A high molecular weight polyethylene polymer is formulated so that the polymer is capable of being injection molded. The polyethylene polymer has a Viscosity Number of greater than about 400 ml/g and has a melt flow rate of greater than about 0.9 g/10 min. The polyethylene polymer is of high purity and is particularly well suited for producing medical products.
Claims20
A medical device comprising:
- an injection molded polymer article, the polymer article comprising a high molecular weight polyethylene polymer, the high molecular weight polyethylene polymer contained in the polymer article having a melt flow index of greater than about 0.8 g/10 min and less than 2.5 g/10 min as measured by ISO Test 1133 at 190° C. and at a load of 21.6 kg, the high molecular weight polyethylene contained in the polymer article having a Viscosity Number of greater than about 400 cm3/g and less than about 900 cm3/g when tested according to ISO Test 1628-3, and wherein the high molecular weight polyethylene polymer contained in the polymer article is also a high density polyethylene polymer having a specific gravity of from about 0.94 g/cm3 to about 0.97 g/cm3 when tested according to ISO Test 1183-1, Method A, and wherein the injection molded article contains the high molecular weight polyethylene polymer in an amount greater than about 80% by weight.
Dependencies are inferred from the claim text.