Process for the production of aqueous polyurethane dispersions
US5025064A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 1990 |
| Grant date | Jun 18, 1991 |
| Priority date | — |
| Expiry date | Jul 3, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/833
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the production of aqueous dispersions of polyurethanes containing chemically incorporated carboxylate groups wherein the counterions to the carboxylate groups are predominantly ammonium ions corresponding to the formula ##STR1## by mixing a starting aqueous dispersion of polyurethanes containing chemically incorporated carboxylate groups wherein the counterions to the carboxylate groups are ammonium ions corresponding to the formula ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 are the same or different and represent C.sub.1-4 alkyl groups, provided that the total number of carbon atoms in these substituents is 3 to 6, with at least an equivalent quantity of ammonia, based on the trialkyl ammonium ions, and subsequently removing under vacuum at least a portion of the displaced trialkyl amines and the excess ammonia, if present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.