Process for the preparation of sterically hindered nitroxyl...

C - Chemistry – Metallurgy – 07 – D

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C07D 211/94 (2006.01) C07B 43/00 (2006.01)

Patent

CA 2654837

The present invention relates to a novel process for the preparation of specific sterically hindered nitroxyl ethers from their corresponding sterically hindered nitroxyl radicals by reacting it with an aldehyde and a hydroperoxide. This nitroxyl ether formation may be carried out from different starting nitroxyl radicals, which are subsequently further reacted to the desired compounds. The compounds prepared by this process are effective as stabilizers for polymers against harmful effects of light, oxygen and/or heat and as flame-retardants for polymers.

La présente invention concerne un nouveau procédé de préparation de nitroxyléthers à encombrement stérique spécifiques à partir de leurs radicaux nitroxyle à encombrement stérique correspondants, par réaction avec un aldéhyde et un hydroperoxyde. La formation de nitroxyléthers peut être réalisée à partir de différents radicaux nitroxyle de départ, lesquels sont ensuite soumis à une réaction supplémentaire en vue de l'obtention des composés souhaités. Les composés préparés au moyen de ce procédé sont efficaces comme stabilisants pour polymères contre les effets nuisibles de la lumière, de l'oxygène et/ou de la chaleur, et comme ignifugeants pour polymères.

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