US 12,110,470 B2
Perfluoropolyether compound, lubricant and magnetic disk
Tomomi Hatta, Kobe (JP); and Tsuyoshi Shimizu, Kobe (JP)
Assigned to Moresco Corporation, Kobe (JP)
Appl. No. 17/620,930
Filed by Moresco Corporation, Kobe (JP)
PCT Filed Jun. 15, 2020, PCT No. PCT/JP2020/023384
§ 371(c)(1), (2) Date Dec. 20, 2021,
PCT Pub. No. WO2021/002178, PCT Pub. Date Jan. 7, 2021.
Claims priority of application No. 2019-124427 (JP), filed on Jul. 3, 2019.
Prior Publication US 2022/0372395 A1, Nov. 24, 2022
Int. Cl. C10M 147/04 (2006.01); C10M 107/38 (2006.01); G11B 5/725 (2006.01); C10N 40/18 (2006.01)
CPC C10M 147/04 (2013.01) [G11B 5/7257 (2020.08); C10M 2213/06 (2013.01); C10N 2040/18 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A lubricant comprising:
a perfluoropolyether compound represented by the following formula (1):
R1—CH2—R2—CH2—R3  (1)
wherein: R1 is HOCH2CH(OH)CH2OCH2CH(OH)CH2O—;
R2 is —(CF2)xO(CF2CF2CF2O)m(CF2)x—, wherein x is a real number of 1 to 3, m is a real number of 1 to 15; and
R3 is —OCH2CH(OH)CH2OH or —OCH2CH(OH)CH2OCH2CH(OH)CH2OH,
wherein at a temperature of 550° C., from heating at a rate of temperature rise of 2° C./min under a nitrogen atmosphere, the lubricant exhibits a 50% weight reduction temperature of higher than 280° C.