Fluorine-containing organopolysiloxane, a surface treatment composition comprising the same and an article treated with the composition

摘要

An organopolysiloxane represented by the following general formula (A), (B) or (C)

         <Bold>Si<Sub>n</Sub>R<Sup>1</Sup><Sub>2n+2</Sub>O<Sub>n-1</Sub></Bold>     <Bold>(A)</Bold>

         <Bold>S</Bold>i<Bold><Sub>n</Sub>R<Sup>1</Sup><Sub>2n</Sub>O<Sub>n</Sub></Bold>     <Bold>(B)</Bold>

         <Bold>Si<Sub>n</Sub>R<Sup>1</Sup><Sub>2n+2</Sub>R<Sup>2</Sup><Sub>k</Sub>O<Sub>n-k</Sub></Bold>     <Bold>(C)</Bold>

wherein R<Sup>1</Sup> may be the same with or different from each other and is a hydrogen atom or a monovalent organic group, R<Sup>2</Sup> is an alkylene group having 2 to 6 carbon atoms, n is an integer of from 2 to 40 and k is an integer of 1 to 3,
characterized in that at least two R<Sup>1</Sup> 's are represented by the following formula (i):
<Chemistry id="chema01" num="0001"><Image id="ia01" he="16" wi="57" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" /></Chemistry>
wherein X is a hydrolyzable group, R<Sup>3</Sup> is an alkyl group having 1 to 4 carbon atoms or a phenyl group, y is an integer of from 1 to 5 and a is 2 or 3; and
one SiR<Sup>1</Sup> bond is represented by the following formula (ii) or
one SiOSi bond is replaced with a bond represented by the following formula (iii):

         <Bold>SiQR<Sub>f</Sub><Sup>1</Sup></Bold>     <Bold>(ii)</Bold>

         <Bold>SiQR<Sub>f</Sub><Sup>2</Sup></Bold>QSi     <Bold>(iii)</Bold>

wherein R<Sub>f</Sub><Sup>l</Sup> is a monovalent group containing a perfluoroether residue, R<Sub>f</Sub><Sup>□</Sup> is a divalent group containing a perfluoroether residue, and Q is a divalent organic group.