Fluorine-based surface treating agent for vapor deposition and article finished with the surface treating agent by vapor deposition

A fluorine-based surface treating agent for vapor deposition, comprising (A) a hydrolyzable group-containing silane modified with a polymer containing a fluorooxyalkylene group and/or a partial hydrolytic condensate, and (B) a polymer containing a fluorooxyalkylene group having a higher weight average molecular weight than component (A), wherein components (A) and (B) are mixed in a weight ratio of from 6:4 to 9:1, and the ratio between the weight average molecular weight of component (A) and the weight average molecular weight of component (B) ranges from 1:1.5 to 1:5,

• wherein the silane of component (A) is one represented by formula (2):
• RfQ-X]a (2)
• wherein:
• a is 1 or 2;
• Rf is selected from the group consisting of formulae (3), (4), and (5) when letter a is 1:
• wherein Y is independently F or CF3 group, m is an integer of 3 to 150, and d′ is an integer of 1 to 3,
• C3F7O(CF2CF2CF2O)mCd′F2d′ (4)
• wherein m is an integer of 3 to 150 and d′ is an integer of 1 to 3, and
• wherein Y is independently F or CF3 group, Z is H or F, p and q each is an integer of 0 to 150, p+q is 3 to 150, d is an integer of 1 to 3, and the recurring units may be randomly joined together, or
• Rf is selected from the group consisting of formulae (6), (7), and (8) when a is 2:
• wherein Y is independently F or CF3 group, d′ is independently an integer of 1 to 3, e is an integer of 2 to 6, each of r and t is an integer of 0 to 150, s is an integer of 0 to 6, and r+t+s is 3 to 150, and the recurring units may be randomly joined together,
• CdF2dO(CF2CF2CF2O)m′CdF2d— (7)
• wherein m′ is an integer of 3 to 150 and d is an integer of 1 to 3, and
• wherein Y is independently F or CF3 group, d is independently an integer of 1 to 3, each of p′ and q′ is an integer of 0 to 150, and p′+q′ is 3 to 150, and the recurring units may be randomly joined together;
• Q is an unsubstituted or substituted divalent hydrocarbon group having 2 to 12 carbon atoms which contains at least one structure selected from the group consisting of amide linkage, ether linkage, ester linkage, vinyl linkage, and diorganosilylene group;
• X is a monovalent organic group having a hydrolyzable group-containing silane and a plurality of hydrolyzable groups;
• and
• wherein the fluorooxyalkylene group-containing polymer of component (B) contains recurring units selected from the group consisting of:
• —CF2O—,
• —CF2CF2O—,
• —CF2CF2CF2O—
• —CF(CF3)CF2O—,
• —CF2CF2CF2CF2O—,
• —CF2CF2CF2CF2CF2CF2O—, and
• —C(CF3)2O—
• in combination with one another and contains no terminal hydrolysable groups, wherein the number of recurring units is 5 to 755.