| 摘要 |
Compositions in the form of multiple emulsions having a X/O/A structure, wherein X is a hydrophilic liquid immiscible with oil; O is an oily phase; A a water phase, comprising: A1) from 0.01% to 10% by weight of a bifunctional alkylamidic (per)fluoropolyether derivative having formula: <?in-line-formulae description="In-line Formulae" end="lead"?>R'-NH-C(O)-CF<SUB>2</SUB>O-R<SUB>f</SUB>-CF<SUB>2</SUB>-C(O)-NH-R (I) <?in-line-formulae description="In-line Formulae" end="tail"?> wherein R and R', equal or different, are a C<SUB>13</SUB>-C<SUB>20 </SUB>linear or branched alkyl chain; R<SUB>f </SUB>represents a (per)fluoropolyether chain comprising repeating units selected from the following: a) -(C<SUB>3</SUB>F<SUB>6</SUB>O)-; b) -(CF<SUB>2</SUB>CF<SUB>2</SUB>O)-; c) -(CFL<SUB>0</SUB>O)-, wherein L<SUB>0</SUB>=-F, -CF<SUB>3</SUB>; d) -CF<SUB>2</SUB>(CF<SUB>2</SUB>)<SUB>z'</SUB>CF<SUB>2</SUB>O-, wherein z' is 1 or 2; e) -CH<SUB>2</SUB>CF<SUB>2</SUB>CF<SUB>2</SUB>O-; the number average molecular weight of R<SUB>f </SUB>being from about 500 to about 5,000; B1) from 0.1% to 0.5% by weight of a copolymer, comprising monomers of acrylic type, swelling in water, characterized by the presence of acid groups and hydrophobic groups, having emulsifying activity after neutralization of the acid groups with bases; the pH of the composition being, at least, 5.
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