| 摘要 |
Carboxylic acids comprising perfluoropolyether chains, of formula: <?in-line-formulae description="In-line Formulae" end="lead"?>T<SUB>1</SUB>-CFW<SUB>1</SUB>-O-R<SUB>f</SUB>-CFW<SUB>2</SUB>-T<SUB>2</SUB> (I)<?in-line-formulae description="In-line Formulae" end="tail"?> wherein T<SUB>1</SUB>, T<SUB>2</SUB>, equal to or different from each other, are selected from the group formed of -CH<SUB>2</SUB>-B-Y-(COOH)<SUB>n</SUB>, -CH(CF<SUB>3</SUB>) O-Y(COOH)<SUB>n</SUB>, -F, -CF<SUB>3</SUB>, -C<SUB>2</SUB>F<SUB>5</SUB>, -(C<SUB>2</SUB>F<SUB>4</SUB>)Cl, wherein B=-O- or -S-; Y=C<SUB>1</SUB>-C<SUB>20 </SUB>alkylene chain, n=1-4; with the proviso that at least one of the two end groups T<SUB>1</SUB>, T<SUB>2 </SUB>be -CH<SUB>2</SUB>-B-Y-(COOH)<SUB>n</SUB>, -CH(CF<SUB>3</SUB>)O-Y(COOH)<SUB>n</SUB>; W<SUB>1</SUB>, W<SUB>2</SUB>, equal to or different from each other, are -F or -CF<SUB>3</SUB>; R<SUB>f </SUB>is a (per)fluoropolyoxyalkylene chain formed of one or more repeating units, statistically distributed along the chain, having a number average molecular weight in the range 500-10,000.
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