Lubricant for magnetic recording medium, and method for producing magnetic recording medium
A lubricant for a magnetic recording medium capable of forming a lubricant layer having excellent adhesion to a protective layer is provided. A lubricant for a magnetic recording medium contains a fluorine-containing ether compound in which a group having an ethylenic carbon-carbon double bond is disposed at one or both terminals of a perfluoroalkyl polyether chain. It is preferable that the group having the ethylenic carbon-carbon double bond is disposed at one terminal of the perfluoroalkyl polyether chain, and a hydroxyl group is disposed at other terminal. It is preferable that the lubricant for a magnetic recording medium contains a compound in which one or more functional groups selected from a hydroxyl group, an amino group, an amido group and a carboxyl group is disposed at one or both terminals of a perfluoroalkyl polyether chain.
1. A lubricant for a magnetic recording medium, comprising a fluorine-containing ether compound in which a group having an ethylenic carbon-carbon double bond is disposed at one terminal of a perfluoroalkyl polyether chain,
and a hydroxyl group is disposed at the other terminal.
2. The lubricant for a magnetic recording medium according to claim 1 , wherein the group having an ethylenic carbon-carbon double bond is a (meth)acryloyl group.
3. The lubricant for a magnetic recording medium according to claim 1 , wherein the group having an ethylenic carbon-carbon double bond is a (meth)acryloyloxy group.
4. The lubricant for a magnetic recording medium according to claim 1 , wherein the lubricant is represented by the following formula (3):
wherein x and y each represent an integer of 1 to 30.
5. The lubricant for a magnetic recording medium according to claim 1 , wherein the lubricant is represented by the following formula (4):
wherein x and y each represent an integer of 1 to 30.
6. The lubricant for a magnetic recording medium according to claim 1 , wherein the lubricant is represented by the following formula (5):
wherein x and y each represent an integer of 1 to 30.
7. The lubricant for a magnetic recording medium according to claim 1 , wherein the lubricant is represented by the following formula (6):
wherein x and y each represent an integer of 1 to 30.
8. The lubricant for a magnetic recording medium according to claim 1 , wherein, in the fluorine-containing ether compound, the perfluoroalkyl polyether chain and the group having an ethylenic carbon-carbon double bond are bonded via a urethane bond.
9. A method of producing a magnetic recording medium, comprising:
a lubricant layer forming step of forming a lubricant layer on a protective layer,
wherein the lubricant layer forming step comprises
applying a solution for forming a lubricant layer on the protective layer wherein the solution contains the lubricant for a magnetic recording medium according to claim 1 , and then
performing irradiation with ultraviolet rays.
10. A lubricant for a magnetic recording medium, comprising:
a fluorine-containing ether compound in which a group having an ethylenic carbon-carbon double bond is disposed at one or both terminals of a perfluoroalkyl polyether chain, and
a second compound in which one or more functional groups which are one or more types selected from the group consisting of a hydroxyl group, an amino group, an amido group and a carboxyl group are disposed at one or both terminals of a second perfluoroalkyl polyether chain.
11. A method of producing a magnetic recording medium, comprising:
a lubricant layer forming step of forming a lubricant layer on a protective layer,
wherein the lubricant layer forming step comprises
applying a solution for forming a lubricant layer on the protective layer wherein the solution contains the lubricant for a magnetic recording medium according to claim 10 , and then
performing irradiation with ultraviolet rays.