Magnetic recording medium, fluorine-containing ether compound and lubricant for magnetic recording medium
A fluorine-containing ether compound of the present invention is represented by the following General Formula (1). (In the General Formula (1), X is a trivalent atom or a trivalent atom group, A is a linking group including at least one polar group, B is a linking group having a perfluoropolyether chain, and D is a polar group or a substituent having a polar group at the end.) [Chem. 1] X A-B-D) 3 (1)
1. A fluorine-containing ether compound represented by the following General Formula (1):
[Chem. 1]
X A-B-D) 3 (1)
(in the General Formula (1), X is a trivalent atom or a trivalent atom group represented by any one of the following General Formula (9) to (23),
A is a linking group including at least one hydroxyl group represented by any one of the following General Formula (2) to General Formula (4):
(in the General Formula (4), p is an integer of 1 to 5), B is a linking group having a perfluoropolyether chain, and D is a polar group or a substituent having a polar group at the end, wherein the polar group included in D is selected from a hydroxyl group, a carboxyl group, an amino group, and an aminocarboxyl group).
2. The fluorine-containing ether compound according to claim 1 ,
wherein B in the General Formula (1) is a linking group represented by the following General Formula (5) or the following General Formula (6):
(in the General Formula (5), m is an integer of 1 to 30 and n is an integer of 1 to 30), (in the General Formula (6), q is an integer of 1 to 30).
3. The fluorine-containing ether compound according to claim 1 ,
wherein D in the General Formula (1) represents a hydroxyl group or any of the following General Formulae (7-1) to (7-3):
(in the General Formula (7-1), r is an integer of 0 to 5),
(in the General Formula (7-2), s is an integer of 0 to 5),
(in the General Formula (7-3), t is an integer of 1 to 5).
4. The fluorine-containing ether compound according to claim 1 , wherein the number-average molecular weight is in a range of 1,000 to 10,000.
5. A lubricant for a magnetic recording medium comprising the fluorine-containing ether compound according to claim 1 .
6. A magnetic recording medium in which at least a magnetic layer, a protective layer, and a lubricating layer are sequentially provided on a substrate,
wherein the lubricating layer contains the fluorine-containing ether compound according to claim 1 .
7. The magnetic recording medium according to claim 6 ,
wherein the average film thickness of the lubricating layer is 0.5 nm to 3 nm.