Polyolefin nanocomposites

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 3/34 (2006.01) C08F 2/44 (2006.01) C08K 7/08 (2006.01) C08K 7/10 (2006.01)

Patent

CA 2323667

The present invention is a nanocomposite which is a dispersion of nanofiller particles derived from layered metal oxides or metal oxide salts. The nanocomposite is advantageously prepared by first swelling an untreated clay in water, then removing the water to form an organophilic clay that is dispersible in non-polar organic solvents. The organophilic clay can then be treated with an alkyl aluminoxane and subsequently a catalyst to form a complex that promotes olefin or styrenic polymerization and platelet dispersion. The nanocomposite can be prepared directly by in situ polymerization of the olefin or the styrene at the nanofiller particles without shear, without an ion exchange step, and without the need to incorporate polar substituents into the polyolefin or polystyrene.

La présente invention concerne un nanocomposite constitué d'une dispersion de particules nanocharges obtenues à partir d'oxydes métalliques en couches ou de sels d'oxyde métallique. On prépare avantageusement ce nanocomposite en faisant d'abord gonfler de l'argile non traitée dans de l'eau, et en retirant ensuite l'eau pour former de l'argile organophilique dispersable dans des solvants organiques non polaires. On peut alors traiter l'argile organophilique obtenue avec un aluminoxane d'alkyle puis avec un catalyseur, pour former un complexe activant la polymérisation oléfinique ou styrénique et la dispersion en plaquettes. Par ailleurs, on peut directement préparer le nanocomposite par polymérisation in situ de l'oléfine ou du styrène dans les particules nanocharges sans cisaillement, ni étape d'échange ionique, et sans avoir à ajouter des substituants polaires dans la polyoléfine ou le polystyrène.

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