Isolation/purification of isocyanate condensates by extraction with liquid or supercritical gas
US4871460A · kind A · utility
5Cited by
1References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1989 |
| Grant date | Oct 3, 1989 |
| Priority date | — |
| Expiry date | Mar 22, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/54
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Isocyanate condensates containing free NCO groups are separated and purified from crude reaction mixtures thereof which include unreacted excess di- or polyisocyanate monomer and at least one isocyanate antagonist, by extracting such crude reaction mixtures with an inert gas, notably carbon dioxide, in either the liquid or supercritical state; the highly purified isocyanate condensates are well adopted for the production of foams, elastomers, adhesives, paints and varnishes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.