	US 12,415,964 B2
	High temperature lubricants for magnetic media having aromatic linker moiety
Daniel Demori Maksuta, San Jose, CA (US); Jianming Wen, Pleasanton, CA (US); and Charles Cheng-Hsing Lee, San Jose, CA (US)
Assigned to Western Digital Technologies, Inc., San Jose, CA (US)
Filed by Western Digital Technologies, Inc., San Jose, CA (US)
Filed on Jan. 19, 2024, as Appl. No. 18/417,018.
Prior Publication US 2025/0236805 A1, Jul. 24, 2025
Int. Cl. C10M 105/18 (2006.01); C10M 105/06 (2006.01); G11B 5/40 (2006.01); G11B 5/725 (2006.01); C10N 20/00 (2006.01); C10N 30/08 (2006.01); C10N 40/18 (2006.01); G11B 5/00 (2006.01)

CPC C10M 105/18 (2013.01) [G11B 5/40 (2013.01); G11B 5/7257 (2020.08); C10M 2207/0406 (2013.01); C10M 2211/0425 (2013.01); C10M 2211/063 (2013.01); C10N 2020/069 (2020.05); C10N 2030/08 (2013.01); C10N 2040/18 (2013.01); G11B 2005/0021 (2013.01)]

20 Claims

1. A lubricant comprising a plurality of segments according to general formula (I):

Rv¹-Rb¹—Re¹-Rc-Re²—Rb²-Rv² (I);

wherein Rc is a non-fluorinated linear divalent linking segment comprising at least one least one first anchoring functional group engageable with a protective overcoat of a magnetic recording medium;

wherein each Re¹and Re²is a moiety having a rotational energy barrier that is greater than a rotational energy barrier of CH₂;

wherein each Rb¹and Rb²independently 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 Rv¹and Rv²independently comprises a moiety having at least one second anchoring functional group engageable with the protective overcoat of the magnetic recording medium, and

wherein the lubricant is selected from the group consisting of formulas (VIII) through (XIII):

and