Nitrile rubber/polyvinyl chloride blends

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 9/02 (2006.01) C08J 3/22 (2006.01) C08K 5/098 (2006.01) C08L 27/06 (2006.01)

Patent

CA 2267568

Disclosed is a process for the making of a polyvinylchloride/acrylonitrile- butadiene rubber blend by: a) coating a polyvinylchloride resin with a stabilizer to form a precoated PVC; b) blending said precoated PVC with one or more acrylonitrile-butadiene rubbers to form a prestabilized NBR/PVC blend; and c) applying heat and pressure to intimately blend said prestabilized NBR/PVC blend into a fluxed NBR/PVC blend. Another aspect is a novel polyvinylchloride/acrylonitrile-butadiene rubber blend having a stabilizer homogeneously and uniformly distributed throughout the microscopic polyvinylchloride domains.

L'invention porte sur un procédé de préparation de mélanges de chlorure de polyvinyle et de caoutchouc acrylonitrile-butadiène consistant (a) à enrober une résine de chlorure de polyvinyle à l'aide d'un stabilisateur de manière à former du PVC préenrobé; (b) à mélanger ledit PVC préenrobé à un ou plusieurs caoutchoucs acrylonitrile-butadiène (NBR) de manière à former un mélange de NBR/PVC préstabilisé; et (c) à appliquer au mélange de la chaleur et de la pression pour le mélanger intimement et obtenir un mélange fluxé de NBR/PVC. L'invention porte également sur un nouveau mélange de chlorure de polyvinyle et de caoutchouc acrylonitrile-butadiène dans lequel le stabilisateur est réparti de manière homogène et régulière à l'intérieur des domaines microscopiques du chlorure de polyvinyle.

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