Method of producing a lubricant for a magnetic disk, lubricant for a magnetic disk, magnetic disk, and method of producing a magnetic disk
AssigneeHoya Corporation
InventorsKota Hara, Koichi Shimokawa, Kota Suzuki
Life of this patent
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Abstract
On producing a lubricant which is used in making a lubrication layer included in a magnetic disk from the lubricant, a phosphorus-containing compound is removed from a raw-material lubricant including the phosphorus-containing compound to produce the lubricant. The magnetic disk includes a substrate on which at least a magnetic layer, a protection layer, and the lubrication layer formed by the use of the lubricant are successively formed.
Claims12
A method of producing a lubricant for a magnetic disk including a lubrication layer, said lubricant being used in making said lubrication layer from said lubricant, said method comprising a removing step of removing, from a raw-material lubricant including a phosphorus-containing compound, said phosphorus-containing compound to produce said lubricant,
- wherein said removing step is for removing, from said raw-material lubricant, said phosphorus-containing compound by bringing said raw-material lubricant into contact with a molecular sieve, and
- wherein said molecular sieve is crystalline zeolite having an effective pore size of 0.3 to 1.0 nm.
A method of producing a lubricant for a magnetic disk including a lubrication layer, said lubricant being used in making said lubrication layer from said lubricant, said method comprising a removing step of removing, from a raw-material lubricant including a phosphorus-containing compound, said phosphorus-containing compound to produce said lubricant,
- wherein said removing step is for removing, from said raw-material lubricant, said phosphorus-containing compound by bringing said raw-material lubricant into contact with a molecular sieve, and
- wherein said raw-material lubricant further includes a fluoropolyether compound having four hydroxyl groups in one molecule.
A method of producing a lubricant for a magnetic disk including a lubrication layer, said lubricant being used in making said lubrication layer from said lubricant, said method comprising a removing step of removing, from a raw-material lubricant including a phosphorus-containing compound, said phosphorus-containing compound to produce said lubricant,
- wherein said removing step is for removing, from said raw-material lubricant, said phosphorus-containing compound by bringing said raw-material lubricant into contact with a molecular sieve,
- wherein said molecular sieve is crystalline zeolite having an effective pore size of 0.3 to 1.0 nm, and
- wherein said raw-material lubricant further includes a fluoropolyether compound having four hydroxyl groups in one molecule.
A method of producing a lubricant for a magnetic disk including a lubrication layer, said lubricant being used in making said lubrication layer from said lubricant, said method comprising a removing step of removing, from a raw-material lubricant including a phosphorus-containing compound, said phosphorus-containing compound to produce said lubricant,
- wherein said removing step is for removing, from said raw-material lubricant, said phosphorus-containing compound by bringing said raw-material lubricant into contact with a molecular sieve and, subsequently, subjecting said raw-material lubricant to molecular distillation, and
- wherein said raw-material lubricant further includes a fluoropolyether compound having four hydroxyl groups in one molecule.
A method of producing a lubricant for a magnetic disk including a lubrication layer, said lubricant being used in making said lubrication layer from said lubricant, said method comprising a removing step of removing, from a raw-material lubricant including a phosphorus-containing compound, said phosphorus-containing compound to produce said lubricant,
- wherein said removing step is for removing, from said raw-material lubricant, said phosphorus-containing compound by bringing said raw-material lubricant into contact with a molecular sieve and, subsequently, subjecting said raw-material lubricant to molecular distillation,
- wherein said molecular sieve is crystalline zeolite having an effective pore size of 0.3 to 1.0 nm, and
- wherein said raw-material lubricant further includes a fluoropolyether compound having four hydroxyl groups in one molecule.
Dependencies are inferred from the claim text.