公开(公告)号：US20180268853A1

公开(公告)日：2018-09-20

申请号：US15977112

申请日：2018-05-11

申请人： WD MEDIA, LLC

发明人： KOICHI SHIMOKAWA ,  KATSUSHI HAMAKUBO ,  KAE ITOH

IPC分类号： G11B5/725 ,  G11B5/86 ,  C10M107/38 ,  C10M171/02 ,  C10M177/00 ,  G11B5/82 ,  G11B5/84

CPC分类号： G11B5/725 ,  C10M107/38 ,  C10M171/02 ,  C10M177/00 ,  C10M2213/003 ,  C10M2213/0606 ,  C10N2220/021 ,  C10N2230/06 ,  C10N2240/204 ,  C10N2250/14 ,  C10N2280/00 ,  G11B5/82 ,  G11B5/8408 ,  G11B5/86

摘要： A magnetic disk of is provided, the magnetic disk having at least a magnetic layer, a carbon protective layer, and a lubrication layer sequentially provided on a substrate. In an embodiment, the lubrication layer a film formed by a lubricant having a perfluoropolyether compound A having a perfluoropolyether main chain in the structure and also having a hydroxyl group at the end and a compound C obtained from a reaction between a compound B expressed by: [Chemical formula 1] CF3(—O—C2F4)m-(O—CF2)n-OCF3 [m and n in the formula are natural numbers.] and aluminum oxide.

公开(公告)号：US20180233166A1

公开(公告)日：2018-08-16

申请号：US15865201

申请日：2018-01-08

申请人： Seagate Technology LLC

发明人： John L. BRAND ,  James D. KIELY

IPC分类号： G11B5/31 ,  G11B5/667 ,  G11B5/82 ,  G11B5/00

CPC分类号： G11B5/3133 ,  G11B5/3116 ,  G11B5/3146 ,  G11B5/41 ,  G11B5/667 ,  G11B5/71 ,  G11B5/725 ,  G11B5/82 ,  G11B2005/0021

摘要： Provided herein is a magnetic write head including a near field transducer and a magnetic recording media including a media lubricant. The media lubricant includes a first portion and a second portion. The second portion of the media lubricant is evaporated in response to heat emitted from the near field transducer. The second portion of the media lubricant that is evaporated removes a contaminant over the near field transducer.

公开(公告)号：US09984715B2

公开(公告)日：2018-05-29

申请号：US14930229

申请日：2015-11-02

申请人： WD MEDIA, LLC

发明人： Koichi Shimokawa ,  Katsushi Hamakubo ,  Kae Itoh

IPC分类号： G11B5/725 ,  G11B5/86 ,  C10M107/38 ,  C10M171/02 ,  C10M177/00 ,  G11B5/84 ,  G11B5/82

CPC分类号： G11B5/725 ,  C10M107/38 ,  C10M171/02 ,  C10M177/00 ,  C10M2213/003 ,  C10M2213/0606 ,  C10N2220/021 ,  C10N2230/06 ,  C10N2240/204 ,  C10N2250/14 ,  C10N2280/00 ,  G11B5/82 ,  G11B5/8408 ,  G11B5/86

摘要： A magnetic disk of is provided, the magnetic disk having at least a magnetic layer, a carbon protective layer, and a lubrication layer sequentially provided on a substrate. In an embodiment, the lubrication layer a film formed by a lubricant having a perfluoropolyether compound A having a perfluoropolyether main chain in the structure and also having a hydroxyl group at the end and a compound C obtained from a reaction between a compound B expressed by: [Chemical formula 1] CF3(—O—C2F4)m-(O—CF2)n-OCF3 [m and n in the formula are natural numbers.] and aluminum oxide.

公开(公告)号：US09890186B2

公开(公告)日：2018-02-13

申请号：US14896048

申请日：2014-06-03

申请人： SOLVAY SPECIALTY POLYMERS ITALY S.P.A.

发明人： Roberto Valsecchi ,  Rosaldo Picozzi ,  Pier Antonio Guarda

IPC分类号： C07F9/6593 ,  C07F9/6581 ,  G11B5/725 ,  C10M105/74 ,  C08G65/00 ,  C08G65/335 ,  C08G65/337

CPC分类号： C07F9/65815 ,  C07F9/65812 ,  C07F9/65817 ,  C08G65/007 ,  C08G65/3356 ,  C08G65/337 ,  C10M105/74 ,  G11B5/725

摘要： A method of manufacturing cyclophosphazenes PFPE derivatives to be used in the lubrication of magnetic recording media is herein provided. The method comprises: a) a (per)fluoropolyether (PFPE) polyol [PFPE (Ppol)] comprising a fluoropolyoxyalkylene chain (Rf) having two chain ends, each chain end comprising at least one hydroxy group, and b) the corresponding alkoxide of perfluoropolyether (Ppol) [PFPE (Palk)] wherein the equivalent concentration of PFPE (Palk) in PFPE (Ppol) is lower than 30%, preferably ranging from 5% to 15%; 2) contacting mixture (M) with a perhalocyclophosphazene (CPhalo) to provide a mixture (M1) containing an equivalent ratio of PFPE (Palk)/(CPhalo) of at least 1; 3) allowing mixture (M1) to react until complete disappearance of P—Cl groups to provide a mixture (M2); 4) submitting mixture (M2) to hydrolysis to provide a mixture (M3); 5) optionally removing (Ppol) from mixture (M3) to provide a mixture (M4). A method of purifying mixture (M4) is also herein provided.

公开(公告)号：US20180025748A1

公开(公告)日：2018-01-25

申请号：US15548335

申请日：2016-02-03

申请人： Dexerials Corporation

发明人： Nobuo TANO ,  Kouki HATSUDA ,  Hirofumi KONDO

IPC分类号： G11B5/725 ,  C10M105/54 ,  C10M105/72 ,  C10M105/58 ,  G11B5/84 ,  C10M159/12

CPC分类号： G11B5/725 ,  C10M105/54 ,  C10M105/58 ,  C10M105/60 ,  C10M105/72 ,  C10M171/00 ,  C10M2215/003 ,  C10M2215/0425 ,  C10M2219/0406 ,  C10N2220/021 ,  C10N2220/04 ,  C10N2230/06 ,  C10N2230/08 ,  C10N2230/10 ,  C10N2240/204 ,  C10N2250/121 ,  G11B5/84

摘要： A lubricant for a magnetic recording medium including an ionic liquid including a Bronsted acid and a Bronsted base that is primary amine as constituents of the ionic liquid, wherein the Bronsted acid includes a fluorine-containing chain, the Bronsted base includes a fluorine-containing chain that is a perfluoroalkyl chain or a perfluoropolyether chain, wherein the fluorine-containing chain in the Bronsted acid is a perfluoropolyether chain or the fluorine-containing chain in the Bronsted base is the perfluoropolyether chain, or the fluorine-containing chain in the Bronsted acid is the perfluoropolyether chain and the fluorine-containing chain in the Bronsted base is the perfluoropolyether chain, and a number average molecular weight of the fluorine-containing chain in the Bronsted acid is 1,500 or less.

公开(公告)号：US20180016510A1

公开(公告)日：2018-01-18

申请号：US15546584

申请日：2016-01-07

申请人： Dexerials Corporation

发明人： Hirofumi Kondo ,  Kouki Hatsuda ,  Nobuo Tano ,  KyungSung Yun

IPC分类号： C10M105/72 ,  C07D471/04 ,  C07C255/05 ,  C07C309/06 ,  C07D233/58 ,  C07D207/06 ,  C10M105/70 ,  C07C211/63 ,  C07D285/15 ,  G11B5/725 ,  C07C311/48

CPC分类号： C10M105/72 ,  C07C211/63 ,  C07C255/05 ,  C07C309/06 ,  C07C311/48 ,  C07D207/06 ,  C07D233/58 ,  C07D285/15 ,  C07D471/04 ,  C10M105/70 ,  C10M171/00 ,  C10M2215/041 ,  C10M2215/16 ,  C10M2215/221 ,  C10M2215/223 ,  C10M2215/2245 ,  C10M2215/305 ,  C10M2219/0406 ,  C10M2219/09 ,  C10M2219/104 ,  C10N2220/04 ,  C10N2230/06 ,  C10N2230/08 ,  C10N2240/204 ,  G11B5/725

摘要： A lubricant, which includes an ionic liquid including a conjugate base and a conjugate acid including 2 or more cations in a molecule of the conjugate acid, wherein the conjugate acid includes a monovalent group including a straight-chain hydrocarbon group having 6 or more carbon atoms, and an acid that is a source of the conjugate base has a pKa in acetonitrile of 10 or less.

公开(公告)号：US20170337945A1

公开(公告)日：2017-11-23

申请号：US15535982

申请日：2015-12-16

申请人： SHOWA DENKO K.K.

发明人： Satoru NAKAMURA ,  Taining HUNG ,  Evance KUO ,  Daizo ENDO

IPC分类号： G11B5/725 ,  C10M111/04 ,  C10M105/54 ,  C10M107/38

CPC分类号： G11B5/725 ,  C10M105/54 ,  C10M107/38 ,  C10M111/04 ,  C10M2211/0425 ,  C10M2213/043 ,  C10N2220/021 ,  C10N2230/56 ,  C10N2240/20 ,  C10N2240/204 ,  C10N2250/08

摘要： The present invention relates to a magnetic recording medium in which a lubricant layer contains a compound A represented by general formula (1) and a compound B represented by general formula (2), satisfying (A/B)=0.2 to 3.0, and has an average thickness of 0.8 nm to 2 nm. R1—C6H4OCH2CH(OH)CH2OCH2—R2—CH2OCH2CH(OH)CH2OH . . . (1) (R1 is an alkoxy group having 1 to 4 carbon atoms. R2 is —CF2O(CF2CF2O)x(CF2O)yCF2— (x, y=0 to 15), —CF2CF2O(CF2CF2CF2O)zCF2CF2— (z=1 to 15), —CF2CF2CF2O(CF2CF2CF2CF2)nCF2CF2CF2— (n=0 to 4). HOCH2CF2CF2O(CF2CF2CF2O)mCF2CF2CH2OCH2CH(OH)CH2OH . . . (2) (m is an integer).

公开(公告)号：US09805755B1

公开(公告)日：2017-10-31

申请号：US14788654

申请日：2015-06-30

申请人： Seagate Technology LLC

发明人： Jiping Yang

IPC分类号： G11B5/66 ,  G11B5/725 ,  C10M105/54 ,  C07C43/13

CPC分类号： G11B5/725 ,  C07C43/137 ,  C10M105/54 ,  C10M107/38 ,  C10M2213/023 ,  C10N2220/021 ,  C10N2230/00 ,  C10N2240/204

摘要： Provided herein is a lubricant including a compound of Formula I L-(CF2CF2O)n—CF2CH2O—N—OCH2CF2O—(CF2CF2O)m-M  (Formula I) wherein L is selected from the group consisting of M is selected from the group consisting of wherein each instance of R1, R2, and R3 is independently selected from the group consisting of hydroxyl, alkoxyl, carbocycyl, phenyl, heterocycyl, piperonyl, carboxyl, alkylamido, acetamido, carbamoyl, N-alkylcarbamoyl, N,N-dialkylcarbamoyl, 2,3-dihydroxy-1-propoxyl, acryloyl, alkacryloyl, methacryloyl, a substituent of methyl methacrylate, and a substituent of glycidyl ether; and wherein n≧1, m≧1, and n and m are the same or different.

公开(公告)号：US20170249964A1

公开(公告)日：2017-08-31

申请号：US15442961

申请日：2017-02-27

申请人： FUJIFILM Corporation

发明人： Norihito KASADA ,  Takuto KUROKAWA ,  Masahito OYANAGI

IPC分类号： G11B5/73 ,  G11B5/706 ,  G11B5/725 ,  G11B5/733 ,  G11B5/735 ,  G11B5/78 ,  G11B5/71

CPC分类号： G11B5/7305 ,  G11B5/702 ,  G11B5/706 ,  G11B5/71 ,  G11B5/725 ,  G11B5/733 ,  G11B5/735 ,  G11B5/78

摘要： The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on one surface of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the other surface thereof, wherein the thickness of the backcoat layer is less than or equal to 0.20 μm, the contact angle for 1-bromonaphthalene that is measured on the surface of the backcoat layer falls within a range of 10.0° to 30.0°, and the contact angle for 1-bromonaphthalene that is measured on the surface of the magnetic layer falls within a range of 45.0° to 55.0°.

公开(公告)号：US20170221513A1

公开(公告)日：2017-08-03

申请号：US15420425

申请日：2017-01-31

申请人： HITACHI MAXELL, LTD.

发明人： Toshio HIROI ,  Shinji KAWAKAMI ,  Kenji TANAKA

IPC分类号： G11B5/65 ,  G11B5/78 ,  G11B5/725

CPC分类号： G11B5/78 ,  G11B5/00813 ,  G11B5/70 ,  G11B5/70642 ,  G11B5/725

摘要： A magnetic recording medium of the present invention includes a non-magnetic substrate, and a magnetic layer containing a magnetic powder. The magnetic powder is constituted by an ε-iron oxide powder. The magnetic layer has a squareness in a thickness direction of 0.65 or more. In a differential curve obtained by differentiating a hysteresis curve in the thickness direction of the magnetic layer, two or more peaks are present. In a case where, out of peaks in the same direction among the above-described peaks, a local maximum of a largest peak in a magnetic field range of +500 oersted [Oe] or more is taken as P1 and a local maximum of a largest peak in a magnetic field range of −500 oersted [Oe] or more and less than +500 oersted [Oe] is taken as P2, a relationship below is satisfied: 0.25≦P2/P1≦0.60.