- METHODS USING AMPHOTERIC SURFACTANTS
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A method of providing a surface effect to a medium or substrate comprising contacting the medium or substrate with a compound of formula (I): wherein Ra is linear or branched F(CF2)n(CH2CF2)m—, or linear or branched F(CF2)r—O—B—;B is (CsF2s) optionally interrupted by 1 to 2 catenary oxygen atoms, each oxygen bonded to two carbon atoms,n is 2 to 4, m is 1 to 4, r is 1 to 4, s is 1 to 4, provided that (r+s) is a maximum of 7,A is O or (CH2)k—COO,R1 is hydrogen or a methyl,R2 and R3 are each independently alkyl having 1 to 6 carbon atoms, andp, q and k are each independently integers from 1 to 10.
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(2011/05/03)
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