Patent ID: 6083424
Filing Date: 2000-07-04
Classification: B01D,C07C,C11D,C23G

Abstract:
A composition used to remove traces of water and/or organic solvents and/or oils from the surfaces of components, comprising:i) hydrofluoropolyethers having the formula:HF.sub.2 CO(CF.sub.2 O).sub.n (CF.sub.2 CF.sub.2 O).sub.m CF.sub.2 Hwherein n and m are integers comprised between 0 and 20, excluding the case wherein m and n are contemporaneously 0, and having boiling point between 30 and 200.degree. C., and having a molar ratio O/C comprised between 0.5 and 1;ii) fluorinated additives having a structure selected from the following:T--OR.sub.f (CFY)--L (I)andL--CF.sub.2 OR.sub.f CF.sub.2 --L (II)wherein L.dbd.X--CH.sub.2 CH.sub.2 (OCH.sub.2 CH.sub.2).sub.n.spsb.o Bwherein X.dbd.CH.sub.2 O, CH.sub.2 NR"", CONR"", CH.sub.2 OCH.sub.2 CH.sub.2 NR"" or CH.sub.2 OCOCH.sub.2 O;wherein R"".dbd.H or a C.sub.1 -C.sub.3 alkyln.sup.0 =0-50;B.dbd.NHC(CH.sub.2 OH).sub.3 or OC(CH.sub.2 OH).sub.3 ;Y.dbd.CF.sub.3 or F;T is selected from --CF.sub.3, --C.sub.2 F.sub.5, --C.sub.3 F.sub.7,ClCF.sub.2 CF(CF.sub.3)--, CF.sub.3 CFClCF.sub.2 --, ClCF.sub.2 CF.sub.2 -- and ClCF.sub.2 --;R.sub.f is selected from the radicals of (per)fluoroalkane having from 4 to 20 carbon atoms, and (per)fluoropolyether comprising repeating units statistically distributed along the polymer chain selected from:--CF.sub.2 CF.sub.2 O; CFYO, wherein Y is equal to F or CF.sub.3 ; C.sub.3 F.sub.6 O; CF.sub.2 (CF.sub.2).sub.z O, wherein z is an integer equal to 2 or 3; CF.sub.2 CF(OR.sub.f)O, wherein R.sub.f is equal to --CF.sub.3, --C.sub.2 F.sub.5, --C.sub.3 F.sub.7 ; and CR.sub.4 R.sub.5 CF.sub.2 CF.sub.2 O wherein R.sub.4 and R.sub.5 are equal to or different from each other and selected from H, Cl and perfluoroalkyl.