Use of (per)fluoropolyether derivatives in the treatment of substrata having a low surface energy
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United States of America Patent
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-
Nov 16, 2004
Grant Date -
Dec 13, 2001
app pub date -
May 4, 2001
filing date -
May 10, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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--R.sub.f --CFY--L--W (I) R.sub.f --CFY--L--W (II) wherein: L is a linking organic group --CO--NR'--(CH.sub.2).sub.q --, with R'.dbd.H or C.sub.1 -C.sub.4 alkyl; q is comprised between 1 and 8; Y.dbd.F, CF.sub.3 ; W is a --Si(R.sub.1).sub..alpha. (OR.sub.2).sub.3-.alpha. group with .alpha.=0,1,2, R.sub.1 and R.sub.2 equal to or different from each other are C.sub.1 -C.sub.6 alkyl groups, C.sub.6 -C.sub.10 aryl groups, C.sub.7 -C.sub.12 alkyl-aryls or aryl-alkyls; R.sub.f 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), (CF.sub.2 CF.sub.2 O), (CF(CF.sub.3)CF.sub.2 O), (CF.sub.2 CF(CF.sub.3)O), wherein X.dbd.F, CF.sub.3.
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