Process for the production of polyisocyanates containing allophanate groups
US4810820A · kind A · utility
56Cited by
8References
7Claims
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Key dates
| Filing date | Aug 12, 1987 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Aug 12, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/7837
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Aliphatic and/or cycloaliphatic polyisocyanates containing allophanate groups are produced by reacting (a) a di- and/or polyisocyanate with aliphatic and/or cycloaliphatic isocyanate groups with (b) a hydroxy compound at a temperature of at least 150.degree. C. for no more than 90 minutes and then rapidly cooling the reaction mixture to a temperature of less than 100.degree. C. It is preferred that the reaction be carried out in the absence of oxygen. The products thus obtained are virtually colorless, have a relatively low viscosity and excellent storage stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.