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US 4,060,552 AGranted
Preparation of N,N'-di-2-naphthyl-p-phenylenediamine
AssigneeThe B. F. Goodrich Company
InventorGeorge Kletecka
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Abstract
An improved method for the reaction of .beta.-naphthol with p-phenylenediamine to produce N,N'-di-2-naphthyl-p-phenylenediamine at lower temperatures and with decreased formation of undesirable by-products is accomplished by reacting with said materials in the presence of boric anhydride or boric acid.
Claims7
In a process for reacting .beta.-naphthol with p-phenylenediamine to form N,N'-di-2-naphthyl-p-phenylenediamine the improvement which comprises including a boric oxide in the reaction.
Dependencies are inferred from the claim text.