Diaminoalkyldiphenyl ethers, a process for their preparation and their use
US4663484A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 25, 1985 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | Nov 25, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/771
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
New diaminoalkyldiphenyl ethers of the formula ##STR1## wherein R.sup.1 and R.sup.2 are identical or different and denote hydrogen or methyl, but R.sup.1 and R.sup.2 do not simultaneously represent methyl, are prepared by a process wherein alkyldiphenyl ethers of the formula ##STR2## wherein R.sup.1 and R.sup.2 have the above-mentioned meaning are acetylated, the diacetyl compounds obtained, in aqueous-alcoholic solution or suspension, are converted to the corresponding dioximes with hydroxylamine, the dried dioximes are subjected to a Beckmann rearrangement and thereafter the diacetylaminoalkyldiphenyl ethers formed are hydrolyzed by means of aqueous mineral acids or alkali metal hydroxide solutions to give the diamines. The new diaminoalkyldiphenyl ethers are used in the preparation of dyestuffs and polyurethanes and serve as monomers for the preparation of polymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.