Fatty ester compositions with improved oxidative stability

Details Fatty ester compositions with improved oxidative stability Fatty ester compositions with improved oxidative stability

C - Chemistry, Metallurgy

10

L

C10L 1/14 (2006.01) C10L 1/22 (2006.01) C11B 5/00 (2006.01)

Patent

CA 2734885

Compositions containing unsaturated fatty esters may be stabilized against atmospheric oxidation by the addition of an antioxidant package containing at least onenitroxide free-radical scavenger and at least one alkylalkanolamine. Compositions treated in this manner show good resistance to atmospheric oxidation and resultant viscosity increase.An advantage of the nitroxide free-radical scavenger is that it stops the oxidation of the unsaturated fatty esters already during the initiation stage. Moreover, it is much less volatile than for example the known alkylhydroxylamine oxygen scavengers. By the use of a nitroxide free- radical scavenger, the composition can thus be stabilized for a longer period of time. The stability period is moreover less affected by the supply of oxygen to the composition. The solubility problem of the nitroxide in the fatty ester component can be solved by dissolving the nitroxide first in the alkylalkanolamine.

L'invention porte sur des compositions contenant des esters gras insaturés, que l'on peut stabiliser à l'oxydation atmosphérique en leur ajoutant un système antioxydant contenant au moins un intercepteur de radicaux libres nitroxyde et au moins une alkylalkanolamine. Les compositions ayant subi un tel traitement possèdent une bonne résistance à l'oxydation atmosphérique et, par conséquent, une viscosité augmentée. L'intercepteur de radicaux libres nitroxyde offre l'avantage d'arrêter l'oxydation des esters gras insaturés dès le stade initial. Il est en outre beaucoup moins volatil que les intercepteurs d'oxygène alkylhydroxylamine connus. En utilisant un intercepteur de radicaux libres nitroxyde, on parvient à stabiliser la composition pendant une période de temps beaucoup plus longue. En outre, la période de stabilité est moins influencée par l'apport en oxygène à la composition. On peut résoudre le problème de la solubilité du nitroxyde dans le composant ester gras en dissolvant d'abord le nitroxyde dans l'alkylalkanolamine.

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