Stabilization of dibromostyrene
AssigneeEthyl Corporation
InventorPhilip F. Jackisch
Life of this patent
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Abstract
Dibromostyrene has a marked tendency to polymerize on storage. The induction period can be lengthened with the use of a stabilizing quantity of n-propylgallate. The induction period can be markedly prolonged when the gallate ester is admixed with phenothiazine, N,N,N',N'-tetramethyl-p-phenylenediamine, or 4-tert-butyl catechol.
Claims6
Dibromostyrene stabilized with a polymerization inhibiting quantity of a lower alkyl ester of gallic acid and a compound selected from the group consisting of phenothiazine, alkyl-substituted phenothiazines, and 4-tert-butylcatechol.
As a composition of matter, a mixture for stabilizing dibromostyrene comprising a lower alkyl gallate and an additional stabilizing compound selected from the class consisting of phenothiazine, 4-tert-butyl catechol and alkyl-substituted phenothiazines where the rate ratio of said gallate to said additional compound is from about 0.01 to about 10 to 1.
Dependencies are inferred from the claim text.