Process for the preparation of uretdione group containing polyisocyanates
US5329003A · kind A · utility
23Cited by
0References
12Claims
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Assignee
Inventor
Key dates
| Filing date | Jul 30, 1992 |
| Grant date | Jul 12, 1994 |
| Priority date | — |
| Expiry date | Jul 30, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/798
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention deals with a process for the preparation of uretdione group containing polyisocyanates comprising reacting monomeric aromatic diisocyanates in the presence of a catalyst whereby imidazoles or benzimidazoles having general structure formulas I or II are used as catalysts ##STR1## or their mixtures are used whereby R.sup.1 through R.sup.7 have the meaning cited in claim 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.