| 摘要 |
Use for improving the hydro- and oil-repellence properties of substrata having a low surface energy of (per)fluoropolyether mono- and bifunctional derivatives having the structures:<paragraph lvl="0"><in-line-formula>W-L-YFC-O-Rf-CFY-L-W (I)</in-line-formula><paragraph lvl="0"><in-line-formula>Rf-CFY-L-W (II)</in-line-formula>wherein: L is a linking organic group -CO-NR'-(CH2)q-, with R'=H or C1-C4 alkyl; q is comprised between 1 and 8; Y=F, CF3; W is a -Si(R1)alpha(OR2)3-alpha group with alpha=0,1,2, R1 and R2 equal to or different from each other are C1-C6 alkyl groups, C6-C10 aryl groups, C7-C12 alkyl-aryls or aryl-alkyls; Rf has a number average molecular weight in the range 200-5,000 and comprises repeating units having at least one of the following structures:<paragraph lvl="0"><in-line-formula>(CFXO), (CF2CF2O), (CF(CF3)CF2O), (CF2CF(CF3)O),</in-line-formula>wherein X=F, CF3.
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