Polyoxymethylene compositions

A polyoxymethylene composition comprising:

• (A) 80 to 99 weight percent of at least one polyoxymethylene polymer;
• (B) 1 to 20 weight percent of at least one modified styrene maleic anhydride copolymer having an acid value of 50 mg KOH/g or less that is the product of modifying a styrene-maleic anhydride copolymer consisting of copolymerized monomers of styrene and maleic anhydride;
• and
• (C) optionally 0.5 to 5 weight percent of at least one additive;
• wherein weight percent is based on the weight of components (A), (B), and (C) in the polyoxymethylene composition and totals 100 weight percent;
• and
• wherein the polyoxymethylene composition exhibits:
• a heat deflection temperature of at least 100° C. when measured according to ISO 75-2A:
• 2013;
• a tensile creep to 10% strain of at least 2 hours when measured at 90° C. and 25 MPa load as determined according to ISO 899-1:2017;
• and
• a melt viscosity retention of at least 90 percent when measured at 215° C., 100 sec−1 shear rate after 20 min of holdup time.