Polyoxymethylene composition and molded article thereof

Details Polyoxymethylene composition and molded article thereof Polyoxymethylene composition and molded article thereof

C - Chemistry, Metallurgy

08

L

C08L 59/00 (2006.01) C08K 3/22 (2006.01) C08K 3/26 (2006.01) C08K 13/02 (2006.01) C08L 33/26 (2006.01) C08L 39/02 (2006.01)

Patent

CA 2136010

Abstract To provide a polyoxymethylene composition which is improved in heat stability, particularly the generation of mold deposits during molding and malfunction due to the formic acid generated from the composition (for example, stain with the substance bleeding from a part made from a rubber and corrosion of a magnetic metal member). To 100 parts by weight of a polyoxymethylene, (a) 0.01 to 5.0 parts by weight of an antioxidant. (b) 0.01 to 5.0 parts by weight of a specific amine polymer and (c) 0.001 to 10 parts by weight of at least one metal-containing compound selected from among oxides and carbonates of magnesium and calcium are added. - 26 -

L'invention concerne une composition de polyoxyméthylène à stabilité thermique améliorée et dont les dépôts dans le moule sont notablement réduits pendant les opérations de moulage. En outre, cette composition supprime les dysfonctionnements provoqués par l'acide formique généré à partir de la composition, et notamment la coloration provoquée par l'exsudat de caoutchouc ainsi que la corrosion des éléments métalliques magnétiques. Cette composition comporte pour 100 parties en poids de polyoxyméthylène, 0,01 à 5,0 parties en poids d'un antioxydant, 0,01 à 5,0 parties en poids d'un polymère aminé spécifié et 0,001 à 10 parties en poids d'au moins un composé métallique appartenant au groupe des oxydes et carbonates de magnésium et de calcium.

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