Substantially pure isocyanurate/polyisocyanates
US4864025A · kind A · utility
11Cited by
1References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1987 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Dec 2, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/54
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Substantially pure isocyanurate/polyisocyanates, i.e., containing no more than about 0.03% by weight of residual diisocyanate monomer and no more than about 1% by weight of diisocyanate dimer, are produced by extracting impure cyclotrimerized diisocyanates with an inert gas in either the liquid or supercritical state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.