Compositions and methods for inhibiting vinyl aromatic monomer polymerization
AssigneeBetzDearborn Inc.
InventorGraciela B. Arhancet
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Abstract
Synergistic composition and method of use are disclosed. The compositions comprise a quinone methide derivative and a hydroxylamine compound. These compositions demonstrate synergism at inhibiting the polymerization of a vinyl aromatic monomer. Preferably the quinone methide derivative is 2,6-di-tert-butyl-4-benzylidene-cyclo-2,5-dienone and the hydroxylamine compound is N,N-bis(hydroxypropyl)hydroxylamine.
Claims20
A method for inhibiting the polymerization of vinyl aromatic monomers comprising adding to said monomers an effective polymerization inhibiting amount of a composition comprising (A) a quinone methide derivative having the formula ##STR3## wherein:
- R.sub.1 and R.sub.2 are independently C.sub.4 to C.sub.18 alkyl;
- C.sub.5 to C.sub.12 cycloalkyl;
- or C.sub.7 to C.sub.15 phenylalkyl, and
- R.sub.3 is aryl, or aryl substituted with C.sub.1 to C.sub.6 alkyl, alkoxy, hydroxy, nitro, amino, carboxy, or mixtures thereof;
- and (B) a hydroxylamine compound having the formula ##STR4## wherein R.sub.10 and R.sub.11 are the same or different and are hydrogen, alkyl, aryl, alkaryl, aralkyl, or hydroxyalkyl groups and preferably have about three to about twenty carbon atoms wherein the weight ratio of (A) to (B) is about 9:1 to about 1:9.
A composition comprising (A) a quinone methide derivative having the formula:
- ##STR5## wherein:
- R.sub.1 and R.sub.2 are independently C.sub.4 to C.sub.18 alkyl;
- C.sub.5 to C.sub.12 cycloalkyl;
- or C.sub.7 to C.sub.15 phenylalkyl, and
- R.sub.3 is aryl, or aryl substituted with C.sub.1 to C.sub.6 alkyl, alkoxy, hydroxy, nitro, amino, carboxy, or mixtures thereof, and (B) a hydroxylamine compound having the formula ##STR6## wherein R.sub.10 and R.sub.11 are the same or different and are hydrogen, alkyl, aryl, alkaryl, aralkyl, or hydroxyalkyl groups and preferably have about three to about twenty carbon atoms wherein the weight ratio of (A) to (B) is about 9:1 to about 1:9.
Dependencies are inferred from the claim text.