Inhibition of polymerization of unsaturated monomers

C - Chemistry – Metallurgy – 07 – B

Patent

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C07B 63/04 (2006.01) C07C 7/20 (2006.01) C07C 15/46 (2006.01) C09K 15/30 (2006.01)

Patent

CA 2395620

Disclosed herein is a method for inhibiting the premature polymerization of ethylenically unsaturated monomers comprising adding to said monomers an effective amount of: A) at least one stable hindered nitroxyl compound having the structural formula (I) wherein R1 and R4 are independently selected from the group consisting of hydrogen, alkyl, and heteroatom-substituted alkyl and R2 and R3 are independently selected from the group consisting of alkyl and heteroatom-substituted alkyl; and X1 and X2 (1) are independently selected from the group consisting of halogen, cyano, COOR7, -S-COR7, -OCOR7, (wherein R7 is alkyl or aryl), amido, -S-C6H5, carbonyl, alkenyl, or alkyl of 1 to 15 carbon atoms, or (2) taken together, form a ring structure with the nitrogen; and B) at least one phenylenediamine, and, optionally, C) at least one nitroaromatic compound.

Procédé permettant d'inhiber la polymérisation prématurée de monomères éthyléniquement insaturés, qui consiste à ajouter à ces monomères une quantité efficace (A) d'au moins un composé nitroxyle inhibé stable de formule structurale (I) dans laquelle R¿1? et R¿4? sont indépendamment sélectionnés dans le groupe constitué par hydrogène, alkyle, et alkyle substitué par un hétéroatome, R¿2? et R¿3? sont indépendamment sélectionnés dans le groupe constitué par alkyle et alkyle substitué par un hétéroatome, et X¿1? et X¿2? (1) sont indépendamment sélectionnés dans le groupe constitué par halogène, cyano, COOR¿7?, -S-COR¿7?, -OCOR¿7?, (R¿7? étant alkyle ou aryle), amido, -S-C¿6?H¿5?, carbonyle, alcényle, ou alkyle ayant 1 à 15 atomes de carbone, ou (2) forment ensemble une structure cyclique avec l'azote, (B) d'au moins une phénylènediamine, et éventuellement (C) d'au moins un composé nitroaromatique.

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