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US 5,672,752 AGranted
Liquid alkylated diphenylamine antioxidant
AssigneeThe BFGoodrich Company
InventorsJohn T. Lai, Deborah S. Filla
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Abstract
A process for monoalkylating diphenylamine using clay catalyst is disclosed which results in a reaction product having substantial amounts of desirable monoalkylated diphenylamine and minimal amounts of less desirable disubstituted diphenylamine and unsubstituted diphenylamine. The disclosed process uses clay catalysts which favor monoalkylation over dialkylation and specific conditions such as reaction temperature and mole ratios of alkylating olefin to diphenylamine.
Claims12
A process for alkylating diphenylamine, comprising:
- reacting unsubstituted diphenylamine with one or more linear olefins having from 6 to 18 carbon atoms and unsaturation between the first and second carbon atom in the presence of a clay catalyst at a temperature from about 130.degree. to about 200.degree. C. for at least one hour with a diphenylamine:linear olefin mole ratio of from about 1:1 to about 1:1.9, and wherein said unsubstituted diphenylamine has less than 20 weight percent of monosubstituted diphenylamine and disubstituted diphenylamine, and
- forming a mixture of diphenylamine and alkylated diphenylamines having at least 50 weight percent monoalkyl substituted diphenylamine, less than 50 weight percent of dialkyl-substituted diphenylamine, and from about 0.01 to about 5 weight percent of unsubstituted diphenylamine
- and wherein said weight percents are based on said mixture of diphenylamine and alkylated diphenylamine.
Dependencies are inferred from the claim text.