Use of (per)fluoropolyether derivatives in the treatment of substrata having a low surface energy

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: W-L-YFC-O-Rf-CFY-L-W Rf-CFY-L-W 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: (CFXO), (CF2CF2O), (CF(CF3)CF2O), (CF2CF (CF3) O), wherein X = F, CF3.