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US 2025/0051562 A1Published application
Polyoxymethylene compositions
AssigneeDelrin USA, LLC
InventorRAMABHADRA RATNAGIRI
Life of this patent
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Abstract
Described herein are polyoxymethylene (POM) compositions comprising polyoxymethylene and styrene maleic anhydride (SMA) copolymers or modified SMA copolymers, said POM compositions exhibiting improved physical properties such as heat deflection temperatures compared to POM compositions which do not comprise SMA copolymers.
Claims29
A polyoxymethylene (POM) composition comprising:
- (A) 80 to 99 weight percent of at least one polyoxymethylene polymer;
- (B) 1 to 20 weight percent of at least one styrene maleic anhydride copolymer;
- and
- (C) optionally 0.5 to 5 weight percent of at least one additive;
- wherein the POM composition exhibits a heat deflection temperature of at least 100° C. when measured according to ISO 75-2A:
- 2013;
- and
- wherein weight percent is based on the weight of components (A), (B), and (C) in the POM composition and totals 100 weight percent.
5 more elements
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;
- 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.
9 more elements
Dependencies are inferred from the claim text.