Ozone-resistant long-term stabilisers

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 5/3435 (2006.01) C08K 5/3492 (2006.01)

Patent

CA 2210555

A description is given of a process for stabilising an organic polymer against ozone in the ambient air, which comprises adding to the polymer as stabiliser a monomeric sterically hindered piperidine compound, or an oligomeric or polymeric sterically hindered piperidine compound containing one or several triazine units, or a secondary sterically hindered piperidine compound, the piperidine compound containing in any case at least one unit of formula I (see fig. I), wherein G is hydrogen or methyl, and G1 and G2 are hydrogen, methyl or, taken together, oxygen. With this process it is possible to make a more accurate prediction of the service time of the polymer and it helps to avoid unnecessarily high dosages of the stabiliser.

On donne la description d'un procédé pour stabiliser un polymère organique résistant à l'ozone à l'air ambiant, qui comprend l'ajout d'un composé pipéridine à encombrement stérique à un polymère, en tant que stabilisateur, ou un composé pipéridine à encombrement stérique oligomérique ou polymérique contenant une ou plusieurs unités de triazine ou un composé secondaire à encombrement stérique, le composé pipéridine contenant, dans tous les cas, au moins une unité de formule I (voir la figure I), où G représente de l'hydrogène ou du méthyle, et G1 et G2 sont de l'hydrogène, du méthyle ou, ensemble, de l'oxygène. Ce procédé permet de faire une prédiction plus juste de la durée des services du polymère et aide à éviter les doses inutilement élevées de stabilisateurs.

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