Method of improving fluorinated surfactants
AssigneeCiba-Geigy Corporation
InventorRobert A. Falk
Life of this patent
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Abstract
Surface properties of solutions of fluorinated surfactants are improved by employing a fluorinated synergist (R.sub.f).sub.n T.sub.m Z wherein R.sub.f is a perfluorinated aliphatic group, T is alkylene, arylene, alkylenethio alkylene, alkyleneoxyalkylene or alkyleneiminoalkylene, Z is a neutral or a polar group, n is 1 or 2 and m is 0 to 2. The resulting synergistic surfactant compositions are useful for all applications where surfactants are employed.
Claims8
A method of improving the surface tension property of cationic, anionic, non-ionic, amphoteric or mixed function fluorinated surfactant by employing in conjunction with said surfactants an effective amount, to increase the surface tension reducing property of said surfactant, of a fluorinated synergist of the formula
- (R.sub.f).sub.n T.sub.m Z
- wherein
- R.sub.f is a straight or branched chain perfluoroalkyl of 1 to 18 carbon atoms or said perfluoroalkyl substituted by perfluoroalkoxy of 2 to 6 carbon atoms,
- n is an integer of 1 or 2,
- T is a divalent group --R.sub.3 -- or a group --R.sub.3 --SCH.sub.2 CHR.sub.1 -- wherein R.sub.3 is straight or branched chain alkylene or haloalkylene of 1 to 12 carbons, arylene of 6 to 12 carbons, alkylenethioalkylene or alkyleneiminoalkylene of 2 to 12 carbons where in said imino group the nitrogen is secondary or tertiary and R.sub.1 is hydrogen or alkyl of 1 to 12 carbons,
- Z is a polar group selected from --CONR.sub.1 R.sub.2, --CN, --CONR.sub.1 COR.sub.2, --SO.sub.2 NR.sub.1 R.sub.2, --R.sub.3 (O.sub.2 CR.sub.1) and --CO.sub.2 R.sub.1 where R.sub.1 and R.sub.2 are independently hydrogen, alkyl of 1 to 12 carbons or alkyl of 1 to 12 carbons substituted with 1 or more --OH, --COCH.sub.3, --SH, --CONH(CH.sub.3), and R.sub.3 is as defined above, with the proviso that said synergist is neutral,
- m is an integer from 0 to 2, and said fluorinated synergist having a solubility in water at 25.degree. C. below 0.01% by weight.
A surfactant composition having improved surface tension properties containing a mixture of cationic, anionic, non-ionic, amphoteric or mixed function fluorinated surfactant and an effective amount to increase the surface tension reducing property of said surfactant, of a fluorinated synergist of the formula
- (R.sub.f).sub.n T.sub.m Z
- wherein
- R.sub.f is a straight or branched chain perfluoroalkyl of 1 to 18 carbon atoms or said perfluoroalkyl substituted by perfluoroalkoxy of 2 to 6 carbon atoms,
- n is an integer of 1 or 2,
- T is a divalent group --R.sub.3 -- or a group --R.sub.3 --SCH.sub.2 CHR.sub.1 -- wherein R.sub.3 is straight or branched chain alkylene or haloalkylene of 1 to 12 carbons, arylene of 6 to 12 carbons, alkylenethioalkylene or alkyleneiminoalkylene of 2 to 12 carbons where in said imino group the nitrogen is secondary or tertiary and R.sub.1 is hydrogen or alkyl of 1 to 12 carbons,
- Z is a polar group selected from --CONR.sub.1 R.sub.2, --CN, --CONR.sub.1 COR.sub.2, --SO.sub.2 NR.sub.1 R.sub.2, --R.sub.3 (O.sub.2 CR.sub.1) and --CO.sub.2 R.sub.1 where R.sub.1 and R.sub.2 are independently hydrogen, alkyl of 1 to 12 carbons or alkyl of 1 to 12 carbons substituted with 1 or more --OH, --COCH.sub.3, --SH, --CONH(CH.sub.3), and R.sub.3 is as defined above, with the proviso that said synergist is neutral,
- m is an integer from 0 to 2, and said fluorinated synergist having a solubility in water at 25.degree. C. below 0.01% by weight.
Dependencies are inferred from the claim text.