Low profile multidentate lubricants for use at sub-nanometer thicknesses in magnetic media
AssigneeWestern Digital Technologies, Inc.
InventorBala K. Pathem
Life of this patent
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Abstract
In one embodiment, a multidentate perfluoropolyether (PFPE) lubricant has the formula Se-So-Si-SL-Si-So-Se, where each So includes at least one perfluoroethyl ether unit, SL is a linker segment, and each Se and Si include at least one functional group configured to attach to a surface. In another embodiment, a multi dentate PFPE lubricant has the formula Se-So(a)-Si-Sm-Si-So(b)-Se, where each So(a), So(b), and Sm include at least one perfluoroethyl ether unit with the proviso that Sm has a different number of perfluoroethyl ether units than at least one of So(a) and So(b), and each Se and Si include at least one functional group configured to attach to a surface.
Claims26
A lubricant, comprising:
- a multidentate perfluoropolyether having the formula:
- Se-So-Si-SL-Si-So-Se,
- wherein each So segment has a molecular structure according to formula (8)
- —OCH2CF2O—(CF2CF2O)n—CF2CH2O—, (8)
- wherein n for each So segment is an integer ranging from 1 to 10;
- wherein SL has a molecular structure according to formula (9):
- —OCH2CH2O— (9),
- wherein Se and Si each includes at least one functional group configured to attach to a surface, wherein the at least one functional group is selected from the group consisting of:
- a hydroxyl group, a piperonyl group, an amine group, a carboxylic acid, a phosphazene group, and combinations thereof.
A lubricant, comprising:
- a multidentate perfluoropolyether having the formula:
- Se-So(a)-Si-Sm-Si-So(b)-Se,
- wherein So(a) has a molecular structure according to formula (16):
- —OCH2CF2O—(CF2CF2O)n—CF2CH2O— (16),
- So(b) has a molecular structure according to formula (17):
- —OCH2CF2O—(CF2CF2O)y—CF2CH2O— (17),
- Sm comprises a molecular structure according to formula 18:
- —(CF2CF2O)k— (18),
- wherein each of n, y and k is independently an integer greater than zero and k is different than at least one of n and y,
- wherein Se and Si each includes at least one functional group configured to attach to a surface, wherein the at least one functional group is selected from the group consisting of:
- a hydroxyl group, a piperonyl group, an amine group, a carboxylic acid, a phosphazene group, and combinations thereof.
Dependencies are inferred from the claim text.