Preparation of N,N'-di-2-naphthyl-p-phenylenediamine
US4060552A · kind A · utility
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7Claims
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Key dates
| Filing date | Dec 12, 1975 |
| Grant date | Nov 29, 1977 |
| Priority date | — |
| Expiry date | Dec 12, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C209/18
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.