Preservatives of formulations for topical use

Use as preservative, in formulations for topical use containing water, of:

• component A):
• a (per)fluoropolyether phosphate of general formula:
• Rf—[CF2CH2—O—L—P(O)(OZ1)(OZ2)]l (I)
• wherein l=1 or 2;
• L is a bivalent linking group, preferably of the (CHR1CHR2O)n type wherein R1, R2 equal to or different from each other are selected from H, CH3;
• n is an integer in the range 1-50, preferably 1-6;
• Z1 equal to or different from Z2 selected from H, alkaline or ammonium cation, di- or tri-alkanolammonium cation wherein alkanol comprises from 1 to 20 C atoms, preferably 1-4 C atoms, di- or tri- or tetra-alkylammonium cation wherein alkyl comprises from 1 to 20 C atoms, preferably 1-4 C atoms, or Rf—CF2CH2——O—L—;
• Rf represents a (per)fluoropolyether chain having number average molecular weight in the range from about 400 to about 1,800, preferably from 500 to 1,300, said (per)fluoropolyether chain comprising repeating units selected from one or more of the following:
• a)—(C3F6O)—;
• b)—(CF2CF2O)—;
• c)—(CFL0O)—, wherein L0=—F, —CF3;
• d)—CF2(CF2) CF2O—, wherein z′ is an integer 1 or 2;
• e)—CH2CF2CF2O—.