Nonionic gemini surfactants with three hydrophilic heads and two lipophilic tails
US5846926A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1997 |
| Grant date | Dec 8, 1998 |
| Priority date | — |
| Expiry date | Jun 9, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C323/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A novel class of nonionic gemini surfactants and methods for their preparation consist of compounds with three hydrophilic heads and two lipophilic tails of the general formula: ##STR1## wherein R.sub.1 and R.sub.3 independently represents a C.sub.1 to C.sub.22 straight or branched chain alkyl, alkylene, aryl or alkylaryl, or hydrogen, with the proviso that both cannot be hydrogen; R.sub.2 represents a C.sub.1 to C.sub.5 straight or branched chain alkyl, alkylene or hydrogen, (Y) represents ##STR2## wherein R.sub.4 represents C.sub.1 to C.sub.3 alkyl or hydrogen and may be the same or different; X represents --(CH.sub.2).sub.a -- wherein a is a whole number of from 1 to 5; --S--, --S--S--, --SO.sub.2, --(CH.sub.2).sub.a SO.sub.2 (CH.sub.2).sub.a --,--O--, --C.dbd.O, or --CH.sub.2 --NR--CH.sub.2 -- wherein R is a C.sub.1 to C.sub.3 straight or branched chain alkyl, alkylene or hydrogen and x, y, and z are whole numbers of from about 6 to about 300. The surfactants exhibit excellent surface active functionality, low cmc and pC.sub.20 values and provide superior efficacies when combined with conventional single chain surfactants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.