Fluoropolyether topcoat lubricants
AssigneeSeagate Technology LLC
InventorsMichael Joseph Stirniman, Samuel John Falcone
Life of this patent
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Abstract
A high-fraction, terminally nonfunctional fluoropolyether lubricant topcoat is applied to a magnetic recording medium. The topcoat provides good stiction and wear properties at a low thickness.
Claims22
A magnetic recording medium comprising a lubricant topcoat having a thickness of less than 1 nm, wherein the lubricant topcoat consists essentially of a high-fraction, terminally non-functional fluoropolyether having an average molecular weight of 6,000 Daltons or greater, and wherein the high-fraction, terminally non-functional fluoropolyether is free of a low molecular weight fraction having a boiling point of less than 150° C. at a pressure of about 10−2 Torr and has end groups that are non-reactive and are selected from the groups consisting of alkyl, haloalkyl, alkoxy, haloalkoxy, aryl, and haloaryl groups.
A method of manufacturing a magnetic recording medium, the method comprising:
- depositing a magnetic layer on a substrate;
- and
- depositing a lubricant on the magnetic layer to form a lubricant topcoat having a thickness of less than 1 nm;
- wherein the lubricant topcoat consists essentially of a high-fraction, terminally non-functional fluoropolyether having an average molecular weight of 6,000 Daltons or greater, and wherein the high-fraction, terminally non-functional fluoropolyether is free of a low molecular weight fraction having a boiling point of less than 150° C. at a pressure of about 10−2 Torr and has end groups that are non-reactive and are selected from the groups consisting of alkyl, haloalkyl, alkoxy, haloalkoxy, aryl, and haloaryl groups.
Dependencies are inferred from the claim text.