Liquification of diphenylmethane diisocyanate by partially reacting the isocyanate groups with blocking agents
US5288899A · kind A · utility
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6Claims
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Key dates
| Filing date | Jun 30, 1993 |
| Grant date | Feb 22, 1994 |
| Priority date | — |
| Expiry date | Jun 30, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/8077
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a liquid, storage-stable isocyanate having a viscosity of less than 100,000 mPa.s at 25.degree. C. and an isocyanate content of from about 10 to 29% by weight, and is prepared by reacting a solid or semi-solid diphenylmethane diisocyanate with a blocking agent. More generally, the liquid isocyanate is prepared by reacting the solid or semi-solid diphenylmethane diisocyanate with the blocking agent in quantities such that from 7 to 55% of the isocyanate groups are blocked. Preferred blocking agents are the ketoximes, and mixtures thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.