Stabilized Polymer Composition Containing an Impact Modifier
AssigneeTicona LLC
InventorsMalvika Bihari, Lowell Larson
Life of this patent
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Abstract
An impact modified polyoxymethylene polymer composition is described containing a melt flow stabilizer. The polymer composition may contain a polyoxymethylene polymer containing functional groups, a thermoplastic elastomer and a coupling agent. A melt flow stabilizer is added to the composition in order to stabilize the melt volume flow rate of the composition after the components have been formulated. The melt flow stabilizer may comprise a pyridine derivative.
Claims27
A polymer composition comprising:
- a polyoxymethylene polymer containing functional groups;
- a thermoplastic elastomer;
- a coupling agent that attaches the thermoplastic elastomer to the polyoxymethylene polymer;
- and
- a melt flow stabilizer that inhibits changes in melt flow over time after the polyoxymethylene polymer, the thermoplastic elastomer, and the coupling agent have been combined together, the melt flow stabilizer being present in the polymer composition in an amount sufficient such that the melt flow rate of the polymer composition when tested at 190° C. and at a load of 2.16 kg does not vary by more than about 30% when comparing the melt flow rate 24 hours after the polyoxymethylene polymer, the thermoplastic elastomer and the coupling agent have been combined to the melt flow rate after 5 days.
A molded article made from the polymer composition defined in claim
A process for catalyzing a chemical reaction between functional groups on a polyoxymethylene polymer and an isocyanate, the process comprising reacting the polyoxymethylene polymer with the isocyanate in the presence of a pyridine derivative.
Dependencies are inferred from the claim text.