Polymerization co-inhibitors for vinyl aromatic compounds
AssigneeCosden Technology, Inc.
InventorsJames M. Watson, James R. Butler, Karen A. Mikkelson
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Abstract
A compound and a process for utilizing the compound to prevent the polymerization of vinyl aromatic compounds, such as styrene, during heating. The compound includes effective amounts of phenothiazine, 4-tert-butylcatechol and 2,6-dinitro-p-cresol respectively, as a polymerization inhibitor system in the presence of oxygen resulting in a less viscous polymer tar and in the effective inhibition of polymerization to temperatures as high as 150.degree. C.
Claims13
A composition for inhibiting polymerization of vinyl aromatic compounds and for reducing the viscosity of polymer formed, comprising:
- (a) an effective amount of 2,6-dinitro-p-cresol;
- (b) an effective amount of phenothiazine;
- and
- (c) an effective amount of 4-tert-butylcatechol.
A process for inhibiting the polymerization of a vinyl aromatic compound and for reducing the viscosity of polymer formed, said process comprising subjecting the vinyl aromatic compound when heated to an inhibitory composition including effective amounts of 2,6-dinitro-p-cresol, 4-tert-butylcatechol, and phenothiazine respectively, in the presence of oxygen.
Dependencies are inferred from the claim text.