Method for the purification of 4,4'-diamino-diphenylmethane
US5312989A · kind A · utility
1Cited by
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13Claims
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Key dates
| Filing date | May 28, 1993 |
| Grant date | May 17, 1994 |
| Priority date | — |
| Expiry date | May 28, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C209/84
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of purifying 4,4'-diaminodiphenylmethane comprising partially melting a crystal of crude 4,4'-diaminodiphenylmethane and removing a melt to obtain a high purity 4,4'-diaminodiphenylmethane. By utilizing the method, a high purity 4,4'-diaminodiphenylmethane is obtained efficiently with a low level of energy consumption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.