Use of a composition based on polyol-treated silicon dioxide...

C - Chemistry – Metallurgy – 08 – K

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C08K 9/04 (2006.01) C08J 3/22 (2006.01) C08K 9/08 (2006.01)

Patent

CA 2209566

The use of a composition based on silicon dioxide as antiblocking agent is described which is characterized in that it has silicon dioxide having a particle size of 2 to 8 µm, a specific surface of 150 to 850 m2/g and a specific pore volume of 1.4 to 2.0 ml/g which has been treated with polyol. This silicon dioxide can be used together with a slip agent as combined antiblocking agent and slip agent. The working-in of the antiblocking agent or of the combined antiblocking agent and slip agent into a polymer is preferably in the form of a masterbatch. A preferred antiblocking agent contains as polyol ethoxylated pentaerythritol in which the pentaerythritol/ethoxy ratio lies in the range from 1:0.5 to 1:25. The antiblocking agent can be obtained by micronizing silicon dioxide to the given particle size and impregnating it with the polyol.

L'invention se rapporte à l'utilisation d'une composition à base de dioxyde de silicium comme agent anti-adhérent, caractérisée en ce qu'elle contient du dioxyde de silicium présentant une grosseur de particules comprise entre 2 et 8 µm, une surface spécifique de 150 à 850 m?2¿/gramme et un volume poreux spécifique de 1,4 à 2,0 ml/gramme, qui a été traité au polyol. Ce dioxyde de silicium peut être utilisé avec un agent glissant pour former un agent anti-adhérent et un agent glissant combinés. L'agent anti-adhérent ou l'agent anti-adhérent et l'agent glissant combinés sont incorporés dans le polymère de préférence sous forme d'un mélange maître. Un agent anti-adhérent préféré contient, comme polyol, du pentaérythritol éthoxylé dans lequel le rapport pentaérythritol/éthoxy est compris entre 1:0,5 et 1:25. Cet agent anti-adhérent peut être obtenu par micronisation du dioxyde de silicium à la grosseur de particules donnée et imprégnation de ce constituant avec le polyol.

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