Fluorinated ether compound, fluorinated ether composition, and coating liquid, as well as substrate having surface layer, and method for its production

1. A fluorinated ether compound represented by the following formula (1):

D 1 -R f1 —O—CH 2 —(C m F 2m O) n -A  (1)

wherein D 1 is CF 3 — or CF 3 —O—; R f1 is a C 1-20 fluoroalkylene group containing at least one hydrogen atom, a C 2-20 fluoroalkylene group containing at least one hydrogen atom and having an etheric oxygen atom between carbon-carbon atoms, a C 1-20 alkylene group, or a C 2-20 alkylene group having an etheric oxygen atom between carbon-carbon atoms; A is a group represented by the following formula (4); m is an integer of from 1 to 6; and

n is an integer of from 1 to 200, provided that when n is 2 or more, (C m F 2m O) n may be made of two or more types of C m F 2m O different in m;

—C a F 2a —B—C b H 2b —SiL c R 3-c   (4)

wherein B is a single bond, or —C g H 2g O—, —C h H 2h O—C(═O)NH— or —C(═O)—NH—; L is a hydrolysable group; R is a hydrogen atom or a monovalent hydrocarbon group; a is an integer of from 1 to 5; b is an integer of from 1 to 10; c is an integer of from 1 to 3; g is an integer of from 1 to 5; and h is an integer of from 1 to 5.

2. The fluorinated ether compound according to claim 1 , wherein —CH 2 —(C m F 2m O) n is —CH 2 CF 2 —O{(CF 2 O) n1 (CF 2 CF 2 O) n2 }(wherein n1 is an integer of at least 1, n2 is an integer of at least 1, n1+n2 is an integer of from 2 to 200, and the bond order of n1 CF 2 O and n2 CF 2 CF 2 O is not limited).

3. The fluorinated ether compound according to claim 1 , wherein R f1 is a group represented by the following formula (3-1), a group represented by the following formula (3-2), or a group represented by the following formula (3-3):

—R F —O—CHFCF 2 —  (3-1)

—R F —CHFCF 2 —  (3-2)

—R F —C z H 2z —  (3-3)

wherein R F is a single bond, a C 1-15 perfluoroalkylene group, or a C 2-15 perfluoroalkylene group having an etheric oxygen atom between carbon-carbon atoms; and z is an integer of from 1 to 4.

4. The fluorinated ether compound according to claim 1 , which has a number average molecular weight of from 2,000 to 10,000.

5. A fluorinated ether composition comprising the fluorinated ether compound as defined in claim 1 , and a fluorinated ether compound other than the fluorinated ether compound represented by the above formula (1).

6. The fluorinated ether composition according to claim 5 , wherein the content of the fluorinated ether compound represented by the above formula (1) is at least 70 mass % in the fluorinated ether composition (100 mass %).

7. The fluorinated ether composition according to claim 5 , wherein the fluorinated ether compound other than the fluorinated ether compound represented by the above formula (1) is a fluorinated ether compound represented by the following formula (2):

D 2 -R f2 —O—CH 2 —(C p F 2p O) q —C d F 2d —CH 2 —O—R f3 -D 3   (2)

wherein each of D 2 and D 3 which are independent of each other, is CF 3 — or CF 3 —O—; each of R f2 and R 3 which are independent of each other, is a C 1-20 fluoroalkylene group, or a C 2-20 fluoroalkylene group having an etheric oxygen atom between carbon-carbon atoms; d is an integer of from 1 to 5; p is an integer of from 1 to 6; q is an integer of from 1 to 200, provided that when q is 2 or more, (C p F 2p O) q may be made of two or more types of C p F 2p O different in p.

8. The fluorinated ether composition according to claim 7 , wherein the total content of the fluorinated ether compound represented by the above formula (1) and the fluorinated ether compound represented by the above formula (2) is at least 80 mass % in the fluorinated ether composition (100 mass %).

9. The fluorinated ether composition according to claim 5 , wherein the fluorinated ether compound other than the fluorinated ether compound represented by the above formula (1) is a fluorinated ether compound represented by the following formula (6):

R F1 —O—(C s F 2s O) t —R F2   (6)

wherein each of R F1 and R F2 which are independent of each other, is a C 1-6 perfluoroalkyl group; s is an integer of from 1 to 6; and t is an integer of from 1 to 200, provided that when t is 2 or more, (C s F 2s O) t may be made of two or more types of C s F 2s O different in s.

10. A coating liquid comprising the fluorinated ether composition as defined in claim 5 and a medium.

11. The coating liquid according to claim 10 , wherein the medium is at least one organic solvent selected from the group consisting of a fluorinated alkane, a fluorinated aromatic compound and a fluoro-alkyl ether.

12. A method for producing a substrate having a surface layer, which comprises applying the coating liquid as defined in claim 10 , on a surface of a substrate, followed by drying.

13. A method for producing a substrate having a surface layer, which comprises vacuum vapor depositing the fluorinated ether composition as defined in claim 5 , on a surface of a substrate.

14. A substrate having a surface layer which is formed of the fluorinated ether composition as defined in claim 5 .

15. A touch panel having, on its input surface, a substrate having a surface layer which is formed of the fluorinated ether composition as defined in claim 5 .

16. A coating liquid comprising the fluorinated ether compound as defined in claim 1 and a medium.

17. The coating liquid according to claim 16 , wherein the medium is at least one organic solvent selected from the group consisting of a fluorinated alkane, a fluorinated aromatic compound and a fluoro-alkyl ether.

18. A method for producing a substrate having a surface layer, which comprises applying the coating liquid as defined in claim 16 , on a surface of a substrate, followed by drying.

19. A method for producing a substrate having a surface layer, which comprises vacuum vapor depositing the fluorinated ether compound as defined in claim 1 , on a surface of a substrate.

20. A substrate having a surface layer which is formed of the fluorinated ether compound as defined in claim 1 .

21. A touch panel having, on its input surface, a substrate having a surface layer which is formed of the fluorinated ether compound as defined in claim 1 .