FLUORHALTIGES OBERFLÄCHENBEHANDLUNGSMITTEL UND DAMIT BEHANDELTE OBERFLÄCHE EINES GEGENSTANDS

摘要

The purpose of the present invention is to provide a surface treating agent which provides a surface where stain does not easily adheres, does not stand out and is easily wiped off.
The present invention is a perfluoropolyether group-containing polyorganosiloxane represented by the following formula (1) and a surface treating agent comprising the same,
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒA k (R) n Z-Q-Rf-Q-Z(R) n A k €ƒ€ƒ€ƒ€ƒ€ƒ(1)
wherein Rf is a divalent perfluoropolyether group; Q is a divalent group linking Rf with Z; Z is a polyorganosiloxane group having at least three siloxane bonds with its valency being trivalent to hendecavalent; R is a monovalent organic group having 8 to 40 carbon atoms, n is an integer of from 1 to 8; A is a group represented by the following formula (2); and k is an integer of from 1 to 9, provided that a total of n + k = the valency of Z - 1
wherein R' is an alkyl group having 1 to 4 carbon atoms or a phenyl group; X is a hydrolysable group, a is 2 or 3; and b is an integer of from 2 to 10.