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US 4,284,815 AGranted
Tungsten catalyzed aniline-formaldehyde condensation
AssigneeTexaco Inc.
InventorsEdward T. Marquis, Lewis W. Watts, Jr., Robert M. Gipson
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Abstract
Covers a method of preparing diaminodiphenylmethanes and higher homologues thereof which comprises the step of condensing aniline and formaldehyde in the presence of a tungsten boride or sulfide catalyst.
Claims3
A method of preparing diaminodiphenylmethane and higher homologues thereof which comprises the step of condensing aniline and formaldehyde in the presence of a tungsten boride or sulfide catalyst.
Dependencies are inferred from the claim text.