IP Library › Granted Patent US 12,338,407
Granted Patent B2
US 12,338,407 · App. 17/772,043 · Granted Jun 24, 2025

Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium

Inventors: Tsuyoshi Kato (Ichihara, JP); Ayano Asano (Ichihara, JP); Natsumi Shibata (Ichihara, JP); Daisuke Yagyu (Ichihara, JP)
Assignee: Resonac Corporation
C10M105/54C07C43/137C07D309/12G11B5/7257C10M2211/0425C10N2040/18
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Quick Facts
Patent No.
US 12,338,407
App. No.
17/772,043
Granted
Jun 24, 2025
Kind
B2
Abstract

This fluorine-containing ether compound is represented by formula (1) shown below. R 1 —CH 2 —R 2 —CH 2 —R 3   (1) In formula (1), R 2 is a perfluoropolyether chain represented by a formula (2) shown below. R 1 is a terminal group that is bonded to R 2 via a CH 2 group, and is represented by a formula (3) shown below. R 3 is bonded to R 2 via a CH 2 group, is a terminal group having at least one hydroxyl group, and may be the same as, or different from, R 1 . —(CF 2 ) p-1 —O—((CF 2 ) p O) q —(CF 2 ) p-1 —  (2) In formula (2), p represents an integer of 2 to 3, and q indicates the average polymerization degree and is a number within a range from 1 to 20. —O(CH 2 —CH(OH)—CH 2 —O) 2 —CH 2 —(CH 2 ) n —OH  (3) In formula (3), n represents an integer of 1 to 8.

Claims (17)

1. A fluorine-containing ether compound represented by formula (Q) shown below:

wherein in formula (Q), yq indicates an average polymerization degree, and represents a number from 1 to 20.

2. A lubricant for a magnetic recording medium, the lubricant containing the fluorine-containing ether compound according to claim 1 .

3. A magnetic recording medium comprising at least a magnetic layer, a protective layer and a lubricant layer provided sequentially on a substrate, wherein the lubricant layer contains the fluorine-containing ether compound according to claim 1 .

4. A fluorine-containing ether compound represented by formula (T) shown below:

wherein

in formula (T), yt indicates the average polymerization degree, and represents a number from 1 to 20.

5. A lubricant for a magnetic recording medium, the lubricant containing the fluorine-containing ether compound according to claim 4 .

6. A magnetic recording medium comprising at least a magnetic layer, a protective layer and a lubricant layer provided sequentially on a substrate, wherein the lubricant layer contains the fluorine-containing ether compound according to claim 4 .

7. A fluorine-containing ether compound represented by formula (A) shown below:

wherein

in formula (G), xg indicates the average polymerization degree, and represents a number from 1 to 14,

wherein

in formula (J), xj indicates the average polymerization degree, and represents a number from 1 to 14.

8. A lubricant for a magnetic recording medium, the lubricant containing the fluorine-containing ether compound according to claim 7 .

9. A lubricant for a magnetic recording medium according to claim 8 , wherein the amount of the fluorine-containing ether compound within the lubricant is 70% by mass or greater.

10. A magnetic recording medium comprising at least a magnetic layer, a protective layer and a lubricant layer provided sequentially on a substrate, wherein the lubricant layer contains the fluorine-containing ether compound according to claim 7 .

Assignments (3)
CHANGE OF ADDRESS Recorded Feb 9, 2024
From: RESONAC CORPORATION
To: RESONAC CORPORATION
Reel/Frame 066547/0677 →
CHANGE OF NAME Recorded Jun 23, 2023
From: SHOWA DENKO K.K.
To: RESONAC CORPORATION
Reel/Frame 064082/0513 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 26, 2022
From: KATO, TSUYOSHI; ASANO, AYANO; SHIBATA, NATSUMI; YAGYU, DAISUKE
To: SHOWA DENKO K.K.
Reel/Frame 059739/0859 →
Priority Claims (1)
JP 2019-202285 · Nov 7, 2019 · national
Continuity (1)
Related Publication 20230002696A1 · Jan 5, 2023
References Cited (132)
US 4526833A · Burguette et al. · 1985 [cited by applicant]
US 6323163B1 · Sasaki et al. · 2001 [cited by applicant]
US 10803898B2 · Fukumoto et al. · 2020 [cited by applicant]
US 11011200B2 · Uetake et al. · 2021 [cited by applicant]
US 11220649B2 · Fukumoto et al. · 2022 [cited by applicant]
US 11225624B2 · Kato · 2022 [cited by examiner]
US 11261394B2 · Kato · 2022 [cited by examiner]
US 11279664B2 · Yagyu et al. · 2022 [cited by applicant]
US 11427779B2 · Yamaguchi et al. · 2022 [cited by applicant]
US 11639330B2 · Nanko · 2023 [cited by examiner]
US 20040235685A1 · Russo et al. · 2004 [cited by applicant]
US 20050123855A1 · Hegel · 2005 [cited by applicant]
US 20050197408A1 · Shirakawa · 2005 [cited by examiner]
US 20060111251A1 · Tonelli et al. · 2006 [cited by applicant]
US 20090281250A1 · Desimone et al. · 2009 [cited by applicant]
US 20100233513A1 · Imai et al. · 2010 [cited by applicant]
US 20100261039A1 · Itoh et al. · 2010 [cited by applicant]
US 20120008228A1 · Mabuchi et al. · 2012 [cited by applicant]
US 20120225217A1 · Itoh et al. · 2012 [cited by applicant]
US 20130209837A1 · Sagata et al. · 2013 [cited by applicant]
US 20150274960A1 · Fukuda et al. · 2015 [cited by applicant]
US 20150371672A1 · Sagata · 2015 [cited by applicant]
US 20160068778A1 · Conley et al. · 2016 [cited by applicant]
US 20170152456A1 · Sagata et al. · 2017 [cited by applicant]
US 20170260472A1 · Sagata · 2017 [cited by examiner]
US 20180009773A1 · Uetake et al. · 2018 [cited by applicant]
US 20180022851A1 · Takao et al. · 2018 [cited by applicant]
US 20180047419A1 · Fukumoto · 2018 [cited by examiner]
US 20180127543A1 · Watanabe et al. · 2018 [cited by applicant]
US 20190084911A1 · Yagyu et al. · 2019 [cited by applicant]
US 20190185621A1 · Naitou et al. · 2019 [cited by applicant]
US 20190352573A1 · Hatta et al. · 2019 [cited by applicant]
US 20190382675A1 · Fukumoto et al. · 2019 [cited by applicant]
US 20190382676A1 · Yamaguchi et al. · 2019 [cited by applicant]
US 20200010619A1 · Minami et al. · 2020 [cited by applicant]
US 20210062101A1 · Kato et al. · 2021 [cited by applicant]
US 20210062102A1 · Kato et al. · 2021 [cited by applicant]
US 20210188766A1 · Nanko et al. · 2021 [cited by applicant]
US 20220169941A1 · Shibata · 2022 [cited by applicant]
US 20220372390A1 · Ayano · 2022 [cited by applicant]
US 20230090239A1 · Nanko · 2023 [cited by applicant]
CN 101121908A · 2008 [cited by applicant]
CN 114599631A · 2022 [cited by applicant]
EP 1479753A2 · 2004 [cited by applicant]
EP 3081549A1 · 2016 [cited by applicant]
JP 61126052A · 1986 [cited by applicant]
JP 1160720A · 1999 [cited by applicant]
JP 1171440A · 1999 [cited by applicant]
JP 2866622B2 · 1999 [cited by applicant]
JP 2000264883A · 2000 [cited by applicant]
JP 2001134924A · 2001 [cited by applicant]
JP 2001209924A · 2001 [cited by applicant]
JP 200269037A · 2002 [cited by applicant]
JP 2004115640A · 2004 [cited by applicant]
JP 2004346318A · 2004 [cited by applicant]
JP 2006131874A · 2006 [cited by applicant]
JP 2009266360A · 2009 [cited by applicant]
JP 2010143855A · 2010 [cited by applicant]
JP 2010241831A · 2010 [cited by applicant]
JP 4632144B2 · 2011 [cited by applicant]
JP 2012009090A · 2012 [cited by applicant]
JP 201233253A · 2012 [cited by applicant]
JP 2013163667A · 2013 [cited by applicant]
JP 2013181014A · 2013 [cited by applicant]
JP 2013181140A · 2013 [cited by applicant]
JP 2014509677A · 2014 [cited by applicant]
JP 5465454B2 · 2014 [cited by applicant]
JP 5613916B2 · 2014 [cited by applicant]
JP 5909837B2 · 2016 [cited by applicant]
JP 6122191B1 · 2017 [cited by applicant]
JP 2018002673A · 2018 [cited by applicant]
JP 2018024614A · 2018 [cited by applicant]
JP 2018035348A · 2018 [cited by applicant]
WO 9817617A1 · 1998 [cited by applicant]
WO 2006011387A1 · 2006 [cited by applicant]
WO 2009035075A1 · 2009 [cited by applicant]
WO 2009123043A1 · 2009 [cited by applicant]
WO 2011099131A1 · 2011 [cited by applicant]
WO 2012170009A2 · 2012 [cited by applicant]
WO 2015087615A1 · 2015 [cited by applicant]
WO 2015199037A1 · 2015 [cited by applicant]
WO 2016084781A1 · 2016 [cited by applicant]
WO 2017145995A1 · 2017 [cited by applicant]
WO 2017154403A1 · 2017 [cited by applicant]
WO 2018116742A1 · 2018 [cited by applicant]
WO 2018139058A1 · 2018 [cited by applicant]
WO 2018139174A1 · 2018 [cited by applicant]
WO 2018147017A1 · 2018 [cited by applicant]
WO 2018159232A1 · 2018 [cited by applicant]
WO 2019039200A1 · 2019 [cited by applicant]
WO 2019049585A1 · 2019 [cited by applicant]
WO 2019054148A1 · 2019 [cited by applicant]
WO 2019087548A1 · 2019 [cited by applicant]
International Search Report for PCT/JP2020/041613, dated Dec. 28, 2020. [cited by applicant]
International Search Report for PCT/JP2020/033971 dated Nov. 24, 2020 [PCT/ISA/210]. [cited by applicant]
International Search Report for PCT/JP2021/003708 dated Mar. 23, 2021. [cited by applicant]
Office Action issued Dec. 21, 2022 in U.S. Appl. No. 17/274,466. [cited by applicant]
Office Action Non-Final dated Jan. 28, 2021, issued in U.S. Appl. U.S. Appl. No. 16/480,464. [cited by applicant]
“Cihai Sciences vol. 1” Edited by Cihai Editorial Committee, Shanghai Lexicographical Publishing House, Aug. 30, 1980, p. 329 (3 pages total). [cited by applicant]
Notice of Reasons for Rejection dated Dec. 24, 2019 from the Japanese Patent Office in Application No. 2016-133653. [cited by applicant]
International Search Report for PCT/JP2017/003165 dated May 9, 2017. [cited by applicant]
International Search Report for PCT/JP2019/033697 dated Nov. 5, 2019. [cited by applicant]
Notice of Allowance dated Feb. 8, 2021 from the US Patent & Trademark Office in U.S. Appl. No. 15/640,729. [cited by applicant]
Notice of Allowance dated Nov. 16, 2021 from the US & Patent & Trademark Office in U.S. Appl. No. 16/082,349. [cited by applicant]
Office Action dated Dec. 2, 2020 from the China National Intellectual Property Administration in CN Application No. 201780012469.9. [cited by applicant]
Office Action dated Jun. 10, 2019 from the US & Patent & Trademark Office in U.S. Appl. No. 15/640,729. [cited by applicant]
Office Action dated Jun. 8, 2021 from the US & Patent & Trademark Office in U.S. Appl. No. 16/082,349. [cited by applicant]
Office Action dated Mar. 4, 2021 from the US & Patent & Trademark Office in U.S. Appl. No. 15/640,729. [cited by applicant]
Office Action dated May 13, 2020 from the US & Patent & Trademark Office in U.S. Appl. No. 15/640,729. [cited by applicant]
Office Action dated May 25, 2021 from the China National Intellectual Property Administration in CN Application No. 201780012469.9. [cited by applicant]
Office Action dated Nov. 12, 2020 from the US & Patent & Trademark Office in U.S. Appl. No. 15/640,729. [cited by applicant]
Office Action dated Oct. 29, 2019 from the US & Patent & Trademark Office in U.S. Appl. No. 15/640,729. [cited by applicant]
Advisory Action Dated Aug. 11, 2021 Issued in U.S. Appl. No. 16/480,464. [cited by applicant]
International Search Report for PCT/JP2017/043451 dated Feb. 27, 2018 [PCT/ISA/210]. [cited by applicant]
International Search Report of PCT/JP2020/010759 dated May 26, 2020 [PCT/ISA/210]. [cited by applicant]
Notice of Allowance Dated Sep. 10, 2021 issued in U.S. Appl. No. 16/480,464. [cited by applicant]
Office Action dated Mar. 11, 2021 from the China National Intellectual Property Administration in CN Application No. 201780070908.1. [cited by applicant]
Office Action Final Dated Apr. 16, 2021 Issued in U.S. Appl. No. 16/480,464. [cited by applicant]
Restriction Election Requirement Dated Nov. 23, 2020 Issued in U.S. Appl. No. 16/480,464. [cited by applicant]
Office Action issued Jan. 19, 2023 in U.S. Appl. No. 17/437,251. [cited by applicant]
International Search Report for PCT/JP2018/000071 dated Mar. 6, 2018 [PCT/ISA/210]. [cited by applicant]
Notice of Allowance issued May 5, 2022 in U.S. Appl. No. 16/480,483. [cited by applicant]
Office Action issued Jan. 19, 2022 in U.S. Appl. No. 16/480,483. [cited by applicant]
Office Action issued Jun. 21, 2021 in U.S. Appl. No. 16/480,483. [cited by applicant]
Office Action issued Oct. 25, 2022 in U.S. Appl. No. 17/274,702. [cited by applicant]
International Search Report for PCT/JP2019/033700 dated Nov. 12, 2019 [PCT/ISA/210]. [cited by applicant]
Office Action issued Jul. 23, 2021 in U.S. Appl. No. 16/644,586. [cited by applicant]
International Search Report for PCT/JP2018/031161, dated Nov. 27, 2018 (PCT/ISA/210). [cited by applicant]
Notice of Allowance issued Feb. 9, 2023 in U.S. Appl. No. 17/274,702. [cited by applicant]
Notice of Allowance issued Nov. 9, 2021 in U.S. Appl. No. 16/644,586. [cited by applicant]
Office Action issued Jun. 7, 2023 in U.S. Appl. No. 17/797,177. [cited by applicant]
Supplemental Notice of Allowance issued Dec. 2, 2021 in U.S. Appl. No. 16/644,586. [cited by applicant]