(Cyclo)condensation of isocyanate compounds
US7524435B2 · kind B2 · utility
14Cited by
15References
8Claims
0Family size
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Inventor
Key dates
| Filing date | Feb 23, 2005 |
| Grant date | Apr 28, 2009 |
| Priority date | — |
| Expiry date | Nov 25, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/222
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The use of a compound comprising a nitrogenous heterocyclic group with five cyclic members including, at least two nitrogen atoms, one of the nitrogen atoms bearing a hydrogen atom to promote the opening/closing reaction of uretidione cycles in the presence of a nucleophile compound provided that, when the nitrogenous heterocyclic group is imidazole, the opening/closing reaction is not the closing reaction of the uretidione cycle in the presence of a quaternary ammonium salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.