| 摘要 |
Subject of the invention is a composition stabilized against premature polymerization comprising a) a light olefin monomer, and an effective polymerization inhibiting amount of b) at least one phenylenediamine of formula (I) wherein R1, R2, and R3 are the same or different and are hydrogen, straight or branched chain alkyl of 1 to 20 carbon atoms, straight or branched chain alkyl of 1 to 20 carbon atoms which is substituted by one to three aryl groups, aryl of 1 to 12 carbon atoms, or aryl of 1 to 12 carbon atoms which is substituted by one to three alkyl groups of 1 to 6 carbon atoms; and c) at least one nitroxide of formula (II) wherein R4 and R5 are independently alkyl of 1 to 4 carbon atoms or are together pentamethylene; and Z1 and Z2 are each methyl or Z1 and Z2 together form a linking moiety which may or may not contain heteroatoms or carbonyl groups and which additionally may be substituted by hydroxy, cyanohydrin, amino, alkoxy, amido, ketal, carboxy, hydantoin, carbamate, or a urethane group. A further subject of the invention is a method for inhibiting the premature polymerization of reactive light olefins and the use of a phenylendiamine together with at least one nitroxide to prevent polymerization of reactive light olefins.
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