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US 11,898,117 B2Granted
High temperature lubricants for magnetic media
AssigneeWestern Digital Technologies, Inc.
InventorsXingliang He, Bala Krishna Pathem
Life of this patent
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Abstract
High temperature lubricants for magnetic media are provided. One such lubricant includes fluoroalkyl, fluoroalkenyl, perfluoroalkyl, or perfluoroalkyl ether segments, anchoring functional groups engageable with a protective overcoat of a magnetic recording media, and cyclic functional groups. The lubricants can be used in conjunction with a magnetic recording medium and/or a magnetic data storage system.
Claims20
A lubricant comprising:
- a plurality of segments according to general formula (I), (II), or (III):
- Re1—Rb1—Rc—Rb2—Re2 (I);
- Re1—Rb1—Re2 (II);
- or
- Re1—Rb1-(Rc-Rb2)m—Re2 (III);
- wherein Rc, when present, is a divalent linking segment comprising an anchoring functional group engageable with a protective overcoat of a magnetic recording media;
- wherein each Rb1 and Rb2, when present, independently comprises a chain segment comprising at least one of a fluoroalkyl ether moiety, a fluoroalkenyl ether moiety, a perfluoroalkyl ether moiety, a perfluoroalkenyl ether moiety, or a combination thereof;
- wherein each of Re1 and Re2 independently comprises a substituted or unsubstituted cyclic anchoring functional group engageable with the protective overcoat of a magnetic recording media;
- wherein one or more of Re1, Re2, and Rc, independently comprises a cyclic functional group comprising at least one of an alicyclic C3-C50 alkyl radical, an alicyclic C3-C50 alkenyl radical, a heterocyclic C3-C50 radical, an aromatic C5-C50 radical, a polycyclic aromatic C10-C50 radical, a heteroaromatic C5-C50 radical, a cyclotriphosphazine radical, or a combination thereof;
- wherein m is from 1 to 20;
- and
- wherein the unsubstituted cyclic anchoring functional group is selected from the group consisting of:
9 more elements
A method of synthesizing a lubricant comprising:
- reacting a perfluoroalkyl compound with an aromatic compound, to yield a compound comprising a plurality of segments according to general formula (I), (II), or (III):
- Re1—Rb1—Rc—Rb2—Re2 (I);
- Re1—Rb1—Re2 (II);
- or
- Re1—Rb1-(Rc-Rb2)m—Re2 (III);
- wherein Rc, when present, is a divalent linking segment comprising an anchoring functional group engageable with a protective overcoat of a magnetic recording medium;
- wherein each Rb1 and Rb2, when present, independently comprises a chain segment comprising at least one of a fluoroalkyl ether moiety, a fluoroalkenyl ether moiety, a perfluoroalkyl ether moiety, a perfluoroalkenyl ether moiety, or a combination thereof;
- wherein each of Re1 and Re2 independently comprises a substituted or unsubstituted cyclic anchoring functional group engageable with a protective overcoat of a magnetic recording media;
- wherein one or more of Re1, Re2 and Rc independently comprises a cyclic functional group comprising at least one of an alicyclic C3-C50 alkyl radical, an alicyclic C3-C50 alkenyl radical, a heterocyclic C3-C50 radical, an aromatic C5-C50 radical, a polycyclic aromatic C10-C50 radical, a heteroaromatic C5-C50 radical, a cyclotriphosphazine radical, or a combination thereof;
- wherein m is from 1 to 20;
- and
- wherein the unsubstituted cyclic anchoring functional group is selected from the group consisting of:
9 more elements
Dependencies are inferred from the claim text.