Impact modified polyacetal compositions

US5599860A · kind A · utility

Inventors

• Nazir A. Memon · Yardley, US
• Richard H. Weese · Washington Crossing, US
• Ursula Ziegler · Hochheim, DE

Key dates

• Filing date: Jun 7, 1995
• Grant date: Feb 4, 1997
• Expiry date: Jun 7, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L59/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to improved polyacetal compositions composed of polyoxymethylene (component A) and a stabilized MBS core shell graft copolymer (component B) formed from a rubber-elastic core based on polybutadiene, and a hard graft shell. The stabilized MBS core shell graft copolymer (component B) contains a special stabilization formulation of at least one hindered phenol, a phosphite, a sulfide, and a pH buffer system. The shaped articles produced from these mixtures are particularly distinguished by an excellent low-temperature impact strength and a good heat aging performance.