Method for separating isocyanate monomers
US9834508B2 · kind B2 · utility
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2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2014 |
| Grant date | Dec 5, 2017 |
| Priority date | — |
| Expiry date | Dec 18, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a method for the separation of isocyanate monomers from isocyanate-containing mixtures by the provision of the mixture in a solvent and dialysis of the dissolved mixture against the solvent by means of a permeable membrane having a pore size in the range of between 5 and 400 nm. The method may in particular be employed for the separation of isocyanate monomers from prepolymers containing isocyanate groups, with said prepolymers being used for the production of adhesives, insulating, and expanding foams.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.