Process for production of polyisocyanates containing at least partly blocked isocyanate groups, compounds obtainable by this process and their use in production of polyurethanes, stoving lacquers or aqueous polyisocyanate solutions or dispersions
US4507427A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1984 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Jul 5, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K2003/321
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the production of organic polyisocyanates containing at least partly blocked isocyanate groups characterized in that specific cyclic dicarbonyl compounds are used as the blocking agent. The present invention also relates to the polyisocyanates containing at least partly blocked isocyanate groups obtainable by this process and to the use of the polyisocyanates containing at least partly blocked isocyanate groups obtainable by this process as reactants for isocyanate-reactive compounds for the production of isocyanate polyaddition products. The present invention also relates to the use of polyisocyanates containing at least partly blocked isocyanate groups obtainable by the above process for the production of aqueous stoving lacquers and to the use of these polyisocyanates for the production of aqueous polyisocyanate solutions or dispersions. The aqueous stoving lacquers and aqueous polyisocyanate solutions or dispersions are mixed with water in the presence of a base used in a quantity which is sufficient to guarantee the solubility or dispersibility of the polyisocyanates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.