| 摘要 |
The present invention provides the use of a fluorinated polyether composition as a surfactant, said fluorinated polyether composition comprising a mixture of fluorinated polyethers of the formula: <?in-line-formulae description="In-line Formulae" end="lead"?>(R<SUB>f</SUB>)<SUB>n</SUB>-X<SUB>w</SUB>-Z (I)<?in-line-formulae description="In-line Formulae" end="tail"?> wherein n is 1 or 2, w is 0 or 1, X is a divalent or trivalent organic linking group, Z is a polar group selected from the group consisting of an acid group or a salt thereof, an ammonium group, an amine-oxide group and an amphoteric group, and R<SUB>f </SUB>represents a perfluorinated polyether group of the formula: <?in-line-formulae description="In-line Formulae" end="lead"?>CF<SUB>3</SUB>CF<SUB>2</SUB>CF<SUB>2</SUB>-O-[CF(CF<SUB>3</SUB>)CF<SUB>2</SUB>O]<SUB>k</SUB>-CF(CF<SUB>3</SUB>)-<?in-line-formulae description="In-line Formulae" end="tail"?> wherein k is at least 1; said mixture of fluorinated polyethers having a weight average molecular weight between 750 g/mol and 5000 g/mol and the amount of perfluorinated polyether groups in said mixture where k is 2 or less, is not more than 10% by weight of the total amount of perfluorinated polyether groups in said mixture.
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