Preparation of partially carbodiimidized methylenebis (phenyl isocyanate)
US4154752A · kind A · utility
20Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 5, 1978 |
| Grant date | May 15, 1979 |
| Priority date | — |
| Expiry date | May 5, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C267/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The instant invention is directed to storage stable liquid, partially carbodiimidized methylenebis(phenyl isocyanate) and to the method of manufacture thereof. The products of the instant invention are produced by heating methylenebis(phenyl isocyanate) at a temperature of from 150.degree. to 300.degree. C. in the presence of from 1 ppb to 10 ppm of a phospholine oxide catalyst. The reaction mixture is then cooled once the desired isocyanate content has been reached. The resultant product can be used to produce a variety of isocyanate-addition reaction products, including polyurethanes, polyureas and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.