Fluorosurfactants

Compounds of the formula (I))

• (Rf-Aa-Cc)n-(spacer)m-Xo (I)
• where
• Rf═CF3—CF2—CF2—O—CF(CF3)—CH2—, CF3—CF2—CF2— or CF3—CF2—CF2—O—CF(CF3)—CO—,
• A=—O—CH2—CHR′—,
• R′═H or alkyl,
• C=alkylene, O, —OCO— or —NR″—, where R″═H, alkyl or —(CH2CHR′″)m′—R″″, where m′=an integer from the range from 1 to 100 and R′″ and R″″, independently of one another, ═H or alkyl, where one or more non-adjacent C atoms may be replaced by O or N, preferably O,
• spacer=a saturated or unsaturated, branched or unbranched hydrocarbon unit, optionally containing heteroatoms,
• X is a hydrophilic group,
• a=0 or 1,
• n=1, 2, 3, 4, 5 or 6,
• c=0 or 1,
• m=0 or 1, and
• o=1, 2, 3 or 4 and o=0 if R″=—(CH2CHR′″)m′—R″″, where R′″ and/or R″″=alkyl, where one or more non-adjacent C atoms have been replaced by O or N,
• where n≧2 if Rf═CF3—CF2—CF2—O—CF(CF3)—CO—
• and the compounds CF3—CF2—CF2—O—CH2—CH2—OH,
• Rf′-O—CH2CH(OSO3Na)—CH2—O—CH2—CH—(C2H5)—C4H9,
• Rf′-O—CH2CH(OSO3H)—(CH2)5—CH3,
• Rf′-O—CO—CH2—CH(OSO3Na)—CO—O—Rf′,
• Rf″-CH2—CH(SO3Na)—Rf″,
• Rf″-CH2—CH(CH2SO3Na)—Rf″ and
• Rf″-CH—(CH3)CH(SO3Na)—Rf″,
• where Rf′═CF3CF2CF2—O—CF(CF3)—CH2—
• and Rf″═CF3CF2CF2—O—CF(CF3)—CO—NHCH2CH2—O—CO—, are excluded.