Fluorinated ether composition, surface modifier, surfactant, liquid composition, and article

Abstract

To provide a fluorinated ether composition capable of satisfying both high lubricity and high adhesive property, a lubricant, surface modifier or surfactant containing the fluorinated ether composition, and a liquid composition containing the fluorinated ether composition. The fluorinated ether composition comprises a fluorinated ether compound (A) represented by (X) n —Y A —(Z) m and a fluorinated ether compound (B) represented by (X) s —Y B —(Z) t , wherein the content of the fluorinated ether compound (A) is from 15 to 80 mass % to the total amount of the fluorinated ether compound (A) and the fluorinated ether compound (B), and in the above formulae, X is HO—CH 2 —P 1 -[(C a F 2a O) b (CFQ 1 CF 2 O) c ]—, Z is R—P 2 —[(C d F 2d O) e (CFQ 2 CF 2 O) f ]—, n is 5 or 6, m is an integer of from 0 to 10, n+m is an integer of from 5 to 16, s is an integer of from 0 to 4, t is an integer of from 0 to 10, s+t is an integer of from 2 to 14, and each of Y A and Y B is a linking group.

What is claimed is: 
     
         1 . A fluorinated ether composition comprising a fluorinated ether compound (A) represented by the following formula (A) and a fluorinated ether compound (B) represented by the following formula (B), wherein the content of the fluorinated ether compound (A) is from 15 to 80 mass % to the total amount of the fluorinated ether compound (A) and the fluorinated ether compound (B):
   (X) n —Y A —(Z) m   (A)
     (X) s —Y B —(Z) t   (B)
   
       provided that the symbols in the formulae have the following meanings:
 in the above formula (A), X is a group represented by the following formula (X), Z is a group represented by the following formula (Z), n is 5 or 6, m is an integer of from 0 to 10, n+m is an integer of from 5 to 16, and Y A  is a (n+m) valent linking group, and 
 in the above formula (B), X and Z have the same meanings as above, respectively, s is an integer of from 0 to 4, t is an integer of from 0 to 10, s+t is an integer of from 2 to 14, and Y B  is a (s+t) valent linking group:
   HO—CH 2 —P 1 -[(C a F 2a O) b (CFQ 1 CF 2 O) c ]—  (X)
 
   R—P 2 -[(C d F 2d O) e (CFQ 2 CF 2 O) f ]—  (Z)
 
 
 in the above formula (X), a is an integer of from 1 to 5, b is an integer of from 1 to 100, c is an integer of from 0 to 100, P 1  is a bivalent linking group containing neither hydroxy group nor alkoxy group, or a single bond, and Q 1  is a halogen atom other than a fluorine atom, a hydrogen atom, a monovalent hydrocarbon group, a fluoroalkyl group, or a fluoroalkyl group having an etheric oxygen atom inserted between carbon-carbon atoms, provided that when b is 2 or more, the plurality of a corresponding to b present in the same molecule may be the same or different from one another, when c is 2 or more, the plurality of Q 1  corresponding to c present in the same molecule may be the same or different from one another, and alignment sequence of b number of (C a F 2a O) units and c number of (CFQ 1 CF 2 O) units in a molecule may be any sequence, 
 in the above formula (Z), d is an integer of from 1 to 5, e is an integer of from 1 to 100, f is an integer of from 0 to 100, P 2  is a bivalent linking group containing neither hydroxyl group nor alkoxy group, or a single bond, Q 2  is a halogen atom other than a fluorine atom, a hydrogen atom, a monovalent hydrocarbon group, a fluoroalkyl group, or a fluoroalkyl group having an etheric oxygen atom inserted between carbon-carbon atoms, and R is a hydrogen atom, a halogen atom, a monovalent hydrocarbon group, a fluoroalkyl group, or a fluoroalkyl group having an etheric oxygen atom inserted between carbon-carbon atoms, provided that when e is 2 or more, the plurality of d corresponding to e present in the same molecule may be the same or different from one another, when f is 2 or more, the plurality of Q 2  corresponding to f present in the same molecule may be the same or different from one another, and alignment sequence of e number of (C d F 2d O) units and f number of (CFQ 2 CF 2 O) units in a molecule may be any sequence. 
 
     
     
         2 . The fluorinated ether composition according to  claim 1 , wherein the number average molecular weight in total of the fluorinated ether compound (A) and the fluorinated ether compound (B) is from 500 to 50,000. 
     
     
         3 . The fluorinated ether composition according to  claim 1 , wherein the fluorinated ether compound (A) has a number average molecular weight of from 2,000 to 50,000 and a molecular weight distribution (Mw/Mn) of from 1.00 to 1.65. 
     
     
         4 . The fluorinated ether composition according to  claim 1 , wherein the fluorinated ether compound (B) has a number average molecular weight of from 500 to 10,000 and a molecular weight distribution (Mw/Mn) of from 1.00 to 1.65. 
     
     
         5 . The fluorinated ether composition according to  claim 1 , wherein the fluorinated ether compound (A) is a compound of the above formula (A) wherein m is an integer of from 0 to 3, X is a group represented by the following formula (X-1), and Z is a group represented by the following formula (Z-1):
   HO—CH 2 —CF 2 O—(CF 2 CF 2 O) b-1 —  (X-1)
     R—O—(CF 2 CF 2 O) e —  (Z-1)
   
       provided that the symbols in the formulae have the following meanings:
 in the above formula (X-1), b is an integer of from 1 to 100, 
 in the above formula (Z-1), e is an integer of from 1 to 100, and R is as defined above. 
 
     
     
         6 . The fluorinated ether composition according to  claim 5 , wherein the above Y A  is a perfluoro organic group obtained by perfluorinating a group with a structure having hydroxy groups removed from a penta- or hexa-polyhydric alcohol. 
     
     
         7 . The fluorinated ether composition according to  claim 1 , wherein the fluorinated ether compound (B) is a compound of the above formula (B) wherein s is 4, t is from 0 to 2, X is a group represented by the following formula (X-1), and Z is a group represented by the following formula (Z-1):
   HO—CH 2 —CF 2 O—(CF 2 CF 2 O) b-1 —  (X-1)
     R—O—(CF 2 CF 2 O) e —  (Z-1)
   
       provided that the symbols in the formulae have the following meanings:
 in the above formula (X-1), b is an integer of from 1 to 100, 
 in the above formula (Z-1), e is an integer of from 1 to 100, and R is as defined above. 
 
     
     
         8 . The fluorinated ether composition according to  claim 7 , wherein the above Y B  is a perfluoro organic group obtained by perfluorinating a group with a structure having hydroxy groups removed from a tetra- to hexa-polyhydric alcohol. 
     
     
         9 . A surface modifier or surfactant containing the fluorinated ether composition as defined in  claim 1 . 
     
     
         10 . A lubricant for a magnetic recording medium, containing the fluorinated ether composition as defined in  claim 1 . 
     
     
         11 . A liquid composition comprising the fluorinated ether composition as defined in  claim 1  and a liquid medium. 
     
     
         12 . The liquid composition according to  claim 11 , wherein the concentration of the fluorinated ether composition is from 0.005 to 50 mass %. 
     
     
         13 . The liquid composition according to  claim 11 , wherein the liquid medium is a fluorinated organic solvent selected from a fluoro-alkane, a fluoro-aromatic compound and a fluoro-alkyl ether. 
     
     
         14 . A coating method which comprises applying the liquid composition as defined in  claim 11  to a substrate surface and then, removing the liquid medium to form a film made of the fluorinated ether composition on the substrate surface. 
     
     
         15 . An article having a film made of the fluorinated ether composition as defined in  claim 1 , on a substrate.