Abstract: A fluorinated pyridinium cationic compound of formula (I) wherein, Rf is F(CF2)6(CH2CF2)m(CH2CH2)n—, m and n are each independently integers of 1 to 3, and R is H, C1 to C5 linear or branched alkyl, or C1 to C5 linear or branched alkoxy, having surfactant properties for lowering surface tension in an aqueous medium or solvent medium, and for use as a foaming agent.
Type:
Grant
Filed:
October 15, 2009
Date of Patent:
May 1, 2012
Assignee:
E. I. du Pont de Nemours and Company
Inventors:
Sheng Peng, Allison Mary Yake, Cheryl Lynn Casper
Abstract: The invention concerns modified hydrophobic polyelectrolytes by amide formation of a hydrophilic skeleton by n-alkylamines whereof the alkyl chain comprises 6 to 22 carbon atoms. Preferably, the amide formation is obtained by di-n-dodecylamine. The hydrophilic skeleton is preferably a sodium polyacrylate or polyacrylic acid corresponding to a statistical acrylate-AMPS copolymer. Said polymers can be used for stabilizing direct or invert emulsions likely to be destabilized or inverted by a modification in the degree of salinity of the aqueous phase or a pH modification. The invention is particularly useful for stabilizing oil drilling fluids or the like in particular drilling, fracturation, acidification or completion fluids.
Type:
Grant
Filed:
July 16, 2004
Date of Patent:
August 28, 2007
Assignee:
M-I L.L.C.
Inventors:
Nathalie Monfreux-Gaillard, Patrick Perrin, Françoise LaFuma, Christopher Sawdon
Abstract: The invention provides a microemulsion that comprises from 0.1 to 99.0 parts by weight hydrofluoroether, from 1.0 to 99.9 parts by weight water, the sum of the parts of hydrofluoroether and water being 100 parts, and fluorinated surfactant. The microemulsions of the invention preferably contain a mixture of fluorinated surfactants and may also contain a non-fluorinated surfactant. The microemulsions of the invention may also further contain cosurfactant and/or cosolvent.
Type:
Grant
Filed:
December 16, 1998
Date of Patent:
October 3, 2000
Assignee:
3M Innovative Properties Company
Inventors:
Jimmie R. Baran, Jr., Mark J. Pellerite