1,3-Diaminocyclohexanes
US4849544A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1988 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Apr 13, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2601/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Sterically hindered 1,3-diaminocyclohexanes which can be used in the preparation of polyurethane, polyurea, polyurethaneurea, and epoxy resins are prepared by hydrogenating a metaphenylenediamine having alkyl substituents of 1-6 carbons in the 4- and 6-positions and optionally also in the 2-position, at least one of the alkyl substituents containing at least two carbons, and the total number of carbons in the alkyl substituents being at least five, at a temperature of about 170.degree.-200.degree. C. and a pressure of at least about 6.9 MPa, preferably about 20-30 MPa, in the presence of a supported ruthenium catalyst and an activating amount of a modifier selected from alkali metal hydroxides and alkoxides and alkali metal amide salts of the meta-phenylenediamine to form the corresponding 1,3-diaminocyclohexane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.