Wear resistant polymer composition having improved surface appearance
AssigneeCelanese Sales Germany GmbH
InventorsQamer Zia, Kirsten Markgraf
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Abstract
A tribologically modified polyoxymethylene polymer composition is disclosed. The polyoxymethylene polymer composition is comprised of a polyoxymethylene polymer in combination with a tribological modifier system. The tribological modifier system may include the combination of a fluoropolymer with a high density polyethylene, such as an oxidized high density polyethylene. The particular formulation provides a synergistic blend of properties. For instance, the polymer composition not only has an excellent surface appearance when molded into articles but has excellent low friction characteristics when tested against aluminum.
Claims19
A polymer composition comprising:
- a polyoxymethylene polymer;
- a first tribological modifier comprising a fluoropolymer, the fluoropolymer being present in the composition in an amount of at least about 1% by weight;
- and
- a second tribological modifier comprising a high density polyethylene, the high density polyethylene having a density greater than 0.94 g/cm3 and less than about 0.99 g/cm3.
A polymer composition comprising;
- a polyoxymethylene polymer;
- a first tribological modifier comprising a fluoropolymer, the fluoropolymer being present in the composition in an amount of at least about 1% by weight;
- a second tribological modifier comprising a high density polyethylene, the high density polyethylene having a density of greater than 0.94 g/cm3 to about 0.99 g/cm3;
- and
- a third tribological modifier comprising an ultrahigh molecular weight polyethylene.
Dependencies are inferred from the claim text.