Use of a betaine surfactant together with an anionic surfactant as a drag-reducing agent
US5902784A · kind A · utility
10Cited by
11References
16Claims
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Key dates
| Filing date | Sep 8, 1997 |
| Grant date | May 11, 1999 |
| Priority date | — |
| Expiry date | Sep 8, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/0391
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A combination of at least one betaine surfactant having an saturated or unsaturated alkyl or acyl group having 10-24 carbon atoms, preferably 14-24 carbon atoms, and an anionic surfactant having the general structure EQU R.sub.1 --B where R.sub.1 is a hydrocarbon group with 10-24 carbon atoms and B is a group ##STR1## or a group ##STR2## in which M is hydrogen or a cationic, preferably monovalent group in a proportion between the betaine surfactant and the anionic surfactant of from 20:1 to 1:2, preferably from 10:1 to 1:1, reduces the flow resistance between a flowing water-based liquid system and a solid surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.