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

1. 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):

Rf Q-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 CF 3 group, m is an integer of 3 to 150, and d′ is an integer of 1 to 3,

C 3 F 7 O(CF 2 CF 2 CF 2 O) m C d′ F 2d′   (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 CF 3 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 CF 3 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,

C d F 2d O(CF 2 CF 2 CF 2 O) m′ C d F 2d —  (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 CF 3 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:

—CF 2 O—,

—CF 2 CF 2 O—,

—CF 2 CF 2 CF 2 O—

—CF(CF 3 )CF 2 O—,

—CF 2 CF 2 CF 2 CF 2 O—,

—CF 2 CF 2 CF 2 CF 2 CF 2 CF 2 O—, and

—C(CF 3 ) 2 O—

in combination with one another and contains no terminal hydrolysable groups, wherein the number of recurring units is 5 to 755.

2. The fluorine-based surface treating agent of claim 1 , wherein Q is selected from the group consisting of:

wherein Me is a methyl group.

3. The fluorine-based surface treating agent of claim 1 , wherein X is a hydrolyzable silyl group, or a linear, branched or cyclic siloxane group or silyl group having a hydrolyzable silyl group or hydrolyzable silylalkylene group.

4. The fluorine-based surface treating agent of claim 1 , wherein X is a group having an alkoxy group-bonded silyl group represented by any one of the following formulas:

wherein letter c is an integer of 2 to 6, and OR is an alkoxy group having 1 to 10 carbon atoms, an alkoxyalkoxy group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, or an acyloxy group having 1 to 10 carbon atoms.

5. The fluorine-based surface treating agent of claim 1 , wherein the fluorooxyalkylene group-containing polymer of component (B) is selected from the group consisting of a polymer having formula (9) and a polymer having formula (10):

wherein x, y and z are values satisfying that the weight average molecular weight of the fluorooxyalkylene group-containing polymer is 1,500 to 20,000.

6. The fluorine-based surface treating agent of claim 1 , which further comprises a fluorine-modified ether solvent or a fluorine-modified aromatic hydrocarbon solvent.

7. An article treated by vapor deposition with the surface treating agent of claim 1 .

8. An optical article treated by vapor deposition with the surface treating agent of claim 1 .

9. A touch panel treated by vapor deposition with the surface treating agent of claim 1 .

10. Antireflective film treated by vapor deposition with the surface treating agent of claim 1 .

11. SiO 2 -treated glass treated by vapor deposition with the surface treating agent of claim 1 .

12. Tempered glass treated by vapor deposition with the surface treating agent of claim 1 .