Low Emission, UV Stabilized High Strength Acetal Copolymer

摘要

Polymer compositions and molded articles made from the polymer compositions are described which contain a high strength polyoxymethylene polymer, an emission control agent, and at least one light stabilizer. The polymer composition not only has excellent resistance to ultraviolet light but also exhibits low formaldehyde emission. In one embodiment, the emission control agent comprises allantoin while the light stabilizer comprises a hindered amine.

主权项

1. A molded product having resistance to ultraviolet light and low formaldehyde emission comprising:
a molded article made from a polymer composition, the polymer composition comprising: an emission control agent comprising allantoin; at least one light stabilizer; and an oxymethylene copolymer containing oxymethylene units and comonomers units, the proportion of comonomers units based on the proportion of oxymethylene units being between about 0.001% by weight and about 1% by weight; wherein the emission control agent and the at least one light stabilizer are present in the polymer composition in an amount such that the polymer composition exhibits a formaldehyde emission pursuant to VDA 275 of less than about 15 ppm and exhibits a color difference value (DEcmc) of less than about 5 after exposure to ten cycles of 280 kJ/m2 irradiation in a xenon arc weatherometer operated according to Volkswagen Test PV1303.