Purification of N,N-di-2-naphthyl-p-phenylenediamine using a mixed solvent system
US3941843A · kind A · utility
2Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 16, 1974 |
| Grant date | Mar 2, 1976 |
| Priority date | — |
| Expiry date | May 16, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2070/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Dark colored impurities, 2-aminonaphthalene and 2-naphthol are extracted from crude N,N'-di-2-naphthyl-p-phenylenediamine by contacting with a mixed solvent system comprising (A) at least one compound selected from the group consisting of alkanols and alkanediols and (B) at least one alkylated benzene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.