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US 5,470,440 AGranted
Method for inhibiting vinyl aromatic monomer polymerization
AssigneeBetz Laboratories, Inc.
InventorGraciela B. Arhancet
Life of this patent
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Abstract
Vinyl aromatic monomer polymerization methods utilizing a composition of 2,6-di-tert-butyl-4-methylphenol and a substituted benzoquinonediimide compound are disclosed. Preferably, the composition is employed in an amount of 1 part to 10,000 parts per million parts monomer during distillation of styrene.
Claims9
A method for inhibiting the polymerization of vinyl aromatic monomers during their distillation comprising adding to said monomers an effective polymerization inhibiting amount of a combination of 2,6-di-tert-butyl-4-methylphenol and at least one substituted benzoquinonediimide compound.
Dependencies are inferred from the claim text.