| 摘要 |
Use in the treatment of ceramic materials for obtaining an easy stain removal, of mono- and bifunctional (per)fluoropolyether derivatives having the following structures: <paragraph lvl="0"><in-line-formula>[Rf-CFY-L-O]mP(O)(O-Z+)3-m (A)</in-line-formula><paragraph lvl="0"><in-line-formula>(O-Z+)2P(O)[O-L-YFC-O-Rf-CFY-L-O-P(O)(O-Z+)]m'-[O-L-YFC-O-Rf-CFY-L-O]P(O)(O-Z+)2 (B)</in-line-formula><paragraph lvl="0"><in-line-formula>Rf-CFY-L-W (C)</in-line-formula><paragraph lvl="0"><in-line-formula>W-L-YFC-O-Rf-CFY-L-W (D)</in-line-formula>wherein m' is an integer from 0 to 20, preferably from 0 to 4; L is an organic group selected from -CH2-(OCH2CH2)n-, -CO-NR'-(CH2)q-, with R'=H or C1-C4 alkyl group; n=0-8, preferably 1-3, q=1-8, preferably 1-3; Z=H, alkaline metal or NR4 group with R=H or C1-C4 alkyl group; Y=F, CF3; m=1,2,3, preferably 1,2; 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, optionally containing one or more ether O, C6-C10 aryl groups, C7-C12 alkyl-aryl or aryl-alkyl groups.
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