Ozone-resistant long-term stabilisers
AssigneeCiba Specialty Chemicals Corporation
InventorFran.cedilla.ois Gugumus
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Abstract
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 ##STR1## wherein G is hydrogen or methyl, and G.sub.1 and G.sub.2 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.
Claims9
A process for stabilising an organic polymer against ozone in the ambient air, wherein the ozone concentration averaged by the service life of the organic polymer is more than 10 .mu.g/m.sup.3, which comprises adding to the polymer an effective ozone stabilising amount of 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 stabiliser containing a radical of formula I ##STR39## wherein G is hydrogen or methyl, and
- G.sub.1 and G.sub.2 are hydrogen, methyl, or taken together, oxygen.
Dependencies are inferred from the claim text.