Color stable and low wear polymer composition and articles made therefrom
AssigneeCelanese International Corporation
InventorsQamer Zia, Thomas Seelmann, Kirsten Markgraf
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Abstract
A colorized and tribologically modified polyoxymethylene polymer composition is disclosed. The polyoxymethylene polymer composition is comprised of a polyoxymethylene polymer in combination with at least one tribological modifier. The tribological modifier may include a fluoropolymer. The polymer composition further contains at least one coloring agent in combination with a color stabilizer. The color stabilizer has been found to dramatically improve color consistency. Polymer articles molded from the polymer composition not only have excellent surface appearance but have excellent low friction characteristics when tested against aluminum.
Claims15
A conveyor device comprising:
- a conveyor chain that moves over a track, the conveyor chain including a plurality of conveyor components having a top surface for receiving and transporting products, the conveyor components being comprised of a polymer composition containing a polyoxymethylene polymer, a first tribological modifier, a coloring agent, and a color stabilizer comprising a non-oxidized polymer wax compounded with the coloring agent, the color stabilizer comprising a polyethylene polymer having a molecular weight of less than about 10,000 g/mol or comprising an ethylene bis-stearamide, the one or more coloring agents being present in the polymer composition in an amount from about 0.1% by weight to about 2% by weight, and wherein the color stabilizer is present in the polymer composition in an amount from about 0.5% by weight to about 2% by weight, and wherein the polymer composition does not contain a silicone, and wherein the polymer composition has a dynamic coefficient of friction against a countermaterial of less than about 0.2, the countermaterial comprising aluminum, and wherein the composition exhibits a wear track depth of less than 2 microns when tested against aluminum.
Dependencies are inferred from the claim text.