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US 5,616,774 AGranted
Inhibition of unsaturated monomers with 7-aryl quinone methides
AssigneeCiba-Geigy Corporation
InventorsSamuel Evans, Matthew E. Gande, Peter Nesvadba, Volker H. von Ahn, Roland A. E. Winter
Life of this patent
Estimating the term…
Abstract
Ethylenically unsaturated monomers are protected from premature polymerization during manufacture and storage by the incorporation therein of an effective stabilizing amount of a 7-aryl quinone methide compound.
Claims26
A composition for inhibiting the premature polymerization of an ethylenically unsaturated monomer which comprises
- (a) an ethylenically unsaturated monomer or mixture of monomers, and
- (b) an effective inhibiting amount of a compound of formula I ##STR8## where R.sub.1 and R.sub.2 are independently alkyl of 4 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms or phenylalkyl of 7 to 15 carbon atoms, and
- R.sub.3 is 2-, 3- or 4-pyridyl, 2- or 3-thienyl, 2- or 3-pyrryl, 2- or 3furyl, aryl of 6 to 10 carbon atoms, or said aryl substituted by one to three alkyl of 1 to 8 carbon atoms, alkoxy of 1 to 8 carbon atoms, alkylthio of 1 to 8 carbon atoms, alkylamino of 1 to 8 carbon atoms, dialkylamino of 2 to 8 carbon atoms, alkoxycarbonyl of 2 to 8 carbon atoms, hydroxy, nitro, amino, cyano, carboxy, aminocarbonyl, chloro or mixtures of said substituents.
A composition for inhibiting the premature polymerization of an ethylenically unsaturated monomer which comprises
- (a) an ethylenically unsaturated monomer or mixture of monomers, and
- (b) an effective inhibiting amount of a synergistic mixture of
- (i) at least one compound of formula I ##STR9## where R.sub.1 and R.sub.2 are independently alkyl of 4 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms or phenylalkyl of 7 to 15 carbon atoms, and
- R.sub.3 is 2-, 3- or 4-pyridyl, 2- or 3-thienyl, 2- or 3-pyrryl, 2- or 3-furyl, aryl of 6 to 10 carbon atoms, or said aryl substituted by one to three alkyl of 1 to 8 carbon atoms, alkoxy of 1 to 8 carbon atoms, alkylthio of 1 to 8 carbon atoms, alkylamino of 1 to 8 carbon atoms, dialkylamino of 2 to 8 carbon atoms, alkoxycarbonyl of 2 to 8 carbon atoms, hydroxy, nitro, amino, cyano, carboxy, aminocarbonyl, chloro or mixtures of said substituents, and
- (ii) at least stable one nitroxyl compound.
2 more elements
Dependencies are inferred from the claim text.