Fluorine-containing ether compound, lubricant for magnetic recording media, and magnetic recording medium
A fluorine-containing ether compound represented by R 1 —R 2 —CH 2 —R 3 —CH 2 —R 4 —R 5 is provided. (R 3 is a perfluoropolyether chain; R 1 and R 5 are each independently any one of an alkyl group that may have a substituent, an organic group having at least one double bond or at least one triple bond, and a hydrogen atom; and —R 2 —CH 2 —R 3 is represented by Formula (2), and R 3 —CH 2 —R 4 — is represented by Formula (3)) -[A]-[B]—O—CH 2 —R 3 (2) R 3 —CH 2 —O—[C]-[D]- (3) ([A] is represented by Formula (4), [B] is represented by Formula (5), [C] is represented by Formula (6), [D] is represented by Formula (7), and in the formula, a and b are integers of 0 to 2, c is an integer of 2 to 5, d and f are integers of 0 to 2, and e is an integer of 2 to 5, and at least one of b and d in the formula is 1 or more)
1. A fluorine-containing ether compound represented by Formula (1):
R 1 —R 2 —CH 2 —R 3 —CH 2 —R 4 —R 5 (1)
(in Formula (1), R 3 is a perfluoropolyether chain, R 1 is an end group bonded to R 2 , R 5 is an end group bonded to R 4 , R 1 and R 5 are each independently any one of an alkyl group that may have a substituent, an organic group having at least one double bond or at least one triple bond, and a hydrogen atom, —R 2 —CH 2 —R 3 is represented by Formula (2), and R 3 —CH 2 —R 4 — is represented by Formula (3))
-[A]-[B]—O—CH 2 —R 3 (2)
R 3 —CH 2 —O—[C]-[D]- (3)
(in Formula (2), [A] is represented by Formula (4), [B] is represented by Formula (5), and [A] and [B] in Formula (2) may be interchanged)
(in Formula (3), [C] is represented by Formula (6), [D] is represented by Formula (7), and [C] and [D] in Formula (3) may be interchanged)
(a in Formula (4) and b in Formula (5) are integers of 0 to 2, c in Formula (5) is an integer of 2 to 5, and d in Formula (6) and fin Formula (7) are an integer of 0 to 2, e in Formula (6) is an integer of 2 to 5, and at least one of b in Formula (5) and d in Formula (6) is 1 or more).
2. The fluorine-containing ether compound according to claim 1 ,
wherein the alkyl group that may have a substituent is an alkyl group having 1 to 6 carbon atoms, wherein the alkyl group includes a hydroxyl group or a cyano group.
3. The fluorine-containing ether compound according to claim 1 ,
wherein the organic group having at least one double bond or at least one triple bond is any one of a group containing an aromatic ring, a group containing a heterocyclic ring, an alkenyl group, and an alkynyl group.
4. The fluorine-containing ether compound according to claim 1 ,
wherein R 3 in Formula (1) is represented by any one of Formulas (8) to (10),
—CF 2 O—(CF 2 CF 2 O) m —(CF 2 O) n —CF 2 — (8)
(m and n in Formula (8) represent average polymerization degrees, and each represent 0 to 30, with a proviso that m or n is 0.1 or more)
—CF(CF 3 )—(OCF(CF 3 )CF 2 ) y —OCF(CF 3 )— (9)
(y in Formula (9) represents an average degree of polymerization and represents 0.1 to 30)
—CF 2 CF 2 O—(CF 2 CF 2 CF 2 O) z —CF 2 CF 2 — (10)
(in Formula (10), z represents an average degree of polymerization and represents 0.1 to 30).
5. The fluorine-containing ether compound according to claim 1 ,
wherein a number-average molecular weight thereof is in a range of 500 to 10000.
6. A lubricant for magnetic recording media, comprising:
the fluorine-containing ether compound according to claim 1 .
7. A magnetic recording medium, comprising:
a substrate; and
at least a magnetic layer, a protective layer, and a lubricating layer in this order on the substrate,
wherein the lubricating layer includes the fluorine-containing ether compound according to claim 1 .
8. The magnetic recording medium according to claim 7 ,
wherein an average film thickness of the lubricating layer is 0.5 nm to 2 nm.