Urea and biuret liquid prepolymers of MDI
US5428124A · kind A · utility
4Cited by
6References
6Claims
0Family size
Assignee
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Key dates
| Filing date | May 23, 1994 |
| Grant date | Jun 27, 1995 |
| Priority date | — |
| Expiry date | May 23, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2120/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Storage stable, liquid prepolymers of diphenylmethane diisocyanate containing urea and/or biuret groups are prepared by reacting an aminocrotonate with a mixture of isocyanates having a specified diphenylmethane diisocyanate isomer content. These prepolymers have isocyanate group contents of from about 5 to about 30%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.