Process for the preparation of concentrated solutions of fluorinated amphoteric surfactants
US4081399A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1975 |
| Grant date | Mar 28, 1978 |
| Priority date | — |
| Expiry date | Sep 22, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S516/919
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention is directed to a process for the preparation of concentrated solutions of fluorinated surfactants of the formula ##STR1## wherein R.sub.f is a perfluoroalkyl or perfluoroalkoxy-perfluoroalkyl group, R.sup.1 is a branched or straight chain alkylene, alkylenethioalkylene, alkyleneoxy-alkylene or alkyleneiminoalkylene group, X is oxygen or an amino group, Q is an organic group containing at least one amino group and y is zero or 1, said process comprising (a) reacting an aqueous solution of an amine with an anhydride previously dissolved in an anhydrous water miscible organic solvent, dissolved in an anhydrous water miscible organic solvent, and (b) reacting the intermediate obtained from the first reaction with an R.sub.f -thiol in the presence of a non-reactive water miscible thiol solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.