HK20790A - Magnetic recording medium having a perfluoropolyether polymer protective coating - Google Patents

Magnetic recording medium having a perfluoropolyether polymer protective coating

Info

Publication number
HK20790A
HK20790A HK207/90A HK20790A HK20790A HK 20790 A HK20790 A HK 20790A HK 207/90 A HK207/90 A HK 207/90A HK 20790 A HK20790 A HK 20790A HK 20790 A HK20790 A HK 20790A
Authority
HK
Hong Kong
Prior art keywords
magnetic recording
recording medium
protective coating
perfluoropolyether
polymer protective
Prior art date
Application number
HK207/90A
Other languages
English (en)
Inventor
Mario Dominguez Burguette
George Delman Foss
Original Assignee
Minnesota Mining & Mfg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minnesota Mining & Mfg filed Critical Minnesota Mining & Mfg
Publication of HK20790A publication Critical patent/HK20790A/xx

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F299/00—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers
    • C08F299/02—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates
    • C08F299/022—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates from polycondensates with side or terminal unsaturations
    • C08F299/024—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates from polycondensates with side or terminal unsaturations the unsaturation being in acrylic or methacrylic groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D171/00—Coating compositions based on polyethers obtained by reactions forming an ether link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D171/02—Polyalkylene oxides
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/72—Protective coatings, e.g. anti-static or antifriction
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/72—Protective coatings, e.g. anti-static or antifriction
    • G11B5/725—Protective coatings, e.g. anti-static or antifriction containing a lubricant, e.g. organic compounds
    • G11B5/7253—Fluorocarbon lubricant
    • G11B5/7257—Perfluoropolyether lubricant
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/72—Protective coatings, e.g. anti-static or antifriction
    • G11B5/726—Two or more protective coatings
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
    • Y10T428/264—Up to 3 mils
    • Y10T428/265—1 mil or less
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31536—Including interfacial reaction product of adjacent layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/3154—Of fluorinated addition polymer from unsaturated monomers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/3154—Of fluorinated addition polymer from unsaturated monomers
    • Y10T428/31544—Addition polymer is perhalogenated

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Magnetic Record Carriers (AREA)
  • Paints Or Removers (AREA)
  • Lubricants (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Laminated Bodies (AREA)
  • Polyethers (AREA)
  • Liquid Crystal (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
HK207/90A 1983-10-03 1990-03-15 Magnetic recording medium having a perfluoropolyether polymer protective coating HK20790A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/538,662 US4526833A (en) 1983-10-03 1983-10-03 Magnetic recording medium having a perfluoropolyether polymer protective coating

Publications (1)

Publication Number Publication Date
HK20790A true HK20790A (en) 1990-03-23

Family

ID=24147888

Family Applications (1)

Application Number Title Priority Date Filing Date
HK207/90A HK20790A (en) 1983-10-03 1990-03-15 Magnetic recording medium having a perfluoropolyether polymer protective coating

Country Status (11)

Country Link
US (1) US4526833A (xx)
EP (1) EP0140582B1 (xx)
JP (1) JPH0740354B2 (xx)
KR (1) KR930002485B1 (xx)
AT (1) ATE45236T1 (xx)
AU (1) AU564966B2 (xx)
CA (1) CA1225546A (xx)
DE (1) DE3479260D1 (xx)
HK (1) HK20790A (xx)
MX (1) MX167249B (xx)
ZA (1) ZA846198B (xx)

Families Citing this family (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4671999A (en) * 1983-09-19 1987-06-09 Minnesota Mining And Manufacturing Company Magnetic recording media having perfluoropolyether coating
US4705699A (en) * 1983-09-19 1987-11-10 Minnesota Mining And Manufacturing Company Method of coating magnetic recording media with perfluoropolyether compositions which are soluble in non-fluorinated solvents
US4689254A (en) * 1984-02-01 1987-08-25 Verbatim Corporation Magnetic recording element having a lubricative and protective coating
US4759991A (en) * 1984-03-06 1988-07-26 Toagosei Chemical Industry Co., Ltd. Magnetic recording medium having a lubricating coating layer
CA1235808A (en) * 1984-03-22 1988-04-26 Tetsuo Oka Vertical magnetic recording medium and process for preparation thereof
JPH0610866B2 (ja) * 1984-06-26 1994-02-09 ティーディーケイ株式会社 磁気記録媒体
US4696845A (en) * 1984-08-27 1987-09-29 Nec Corporation Magnetic storage medium with lubricating coating
US4729924A (en) * 1984-12-21 1988-03-08 Minnesota Mining And Manufacturing Company Metallic thin film magnetic recording medium having a hard protective layer
US4803130A (en) * 1984-12-21 1989-02-07 Minnesota Mining And Manufacturing Company Reactive sputtering process for recording media
JPS61189693A (ja) * 1985-02-19 1986-08-23 旭硝子株式会社 電子部品の防湿コ−テイング方法
JPS61240430A (ja) * 1985-04-18 1986-10-25 Tdk Corp 磁気記録媒体
JPS61253634A (ja) * 1985-05-01 1986-11-11 Hitachi Maxell Ltd 磁気記録媒体
IT1187676B (it) * 1985-07-03 1987-12-23 Montefluos Spa Processo per la lubrificazione di organi accessori di cassette contenenti nastri magnetici
US4797303A (en) * 1985-09-04 1989-01-10 Unisys Corp. Surface lubricants for disc record
IT1191634B (it) * 1985-10-30 1988-03-23 Ausimont Spa Procedimento per la protezione e la lubrificazione di superfici sottoposte ad attrito ed usura
US4642246A (en) * 1985-11-12 1987-02-10 Magnetic Peripherals, Inc. Process for chemically bonding a lubricant to a magnetic disk
US4758474A (en) * 1985-11-20 1988-07-19 Nec Corporation Magnetic recording member
JPH0673178B2 (ja) * 1986-02-04 1994-09-14 株式会社日立製作所 磁気記録媒体
IT1188635B (it) * 1986-03-27 1988-01-20 Ausimont Spa Lubrificanti per fluoropolieterei interni per mezzi magnetici di registrazione
JPH0690787B2 (ja) * 1987-06-16 1994-11-14 株式会社日立製作所 磁気記録媒体
JPH0675287B2 (ja) * 1987-10-07 1994-09-21 富士写真フイルム株式会社 磁気記録媒体
US4849291A (en) * 1987-12-02 1989-07-18 Eastman Kodak Company Magnetic recording element
US4873140A (en) * 1988-04-27 1989-10-10 Minnesota Mining And Manufacturing Company Articles having low adhesion articles having coatings thereon
US4977021A (en) * 1988-08-05 1990-12-11 Hoechst Celanese Corporation Methods for forming magnetic coatings using trioxane recording media having such coatings
US5030478A (en) * 1989-03-03 1991-07-09 International Business Machines Corporation Process for bonding lubricants to thin film recording media
GB8916739D0 (en) * 1989-07-21 1989-09-06 Minnesota Mining & Mfg Protective layer for magnetic recording media
AU632869B2 (en) * 1989-12-14 1993-01-14 Minnesota Mining And Manufacturing Company Fluorocarbon-based coating compositions and articles derived therefrom
US5114482A (en) * 1990-03-02 1992-05-19 Hertel Terry J Ski wax for use with sintered base snow skis
JPH03267178A (ja) * 1990-03-16 1991-11-28 Hitachi Ltd 潤滑膜の形成方法及び磁気記録媒体の製造方法
US5252400A (en) * 1990-11-13 1993-10-12 Matsushita Electric Industrial Co., Ltd. Fluorine-containing compounds
DE69219521T2 (de) * 1991-07-15 1997-08-14 Matsushita Electric Ind Co Ltd Magnetisches Aufzeichnungsmedium, Gleitkörper und Methode zu ihrer Herstellung
US5232791A (en) * 1991-12-23 1993-08-03 Minnesota Mining And Manufacturing Company Magnetic recording medium having a carbon rich coating
JPH06274859A (ja) * 1993-03-18 1994-09-30 Hitachi Ltd 磁気記録媒体および磁気記録再生装置
US5464667A (en) * 1994-08-16 1995-11-07 Minnesota Mining And Manufacturing Company Jet plasma process and apparatus
US5624713A (en) * 1996-01-25 1997-04-29 Zardoz Llc Method of increasing lubricity of snow ski bases
US6203898B1 (en) 1997-08-29 2001-03-20 3M Innovatave Properties Company Article comprising a substrate having a silicone coating
JP2956674B2 (ja) * 1997-12-01 1999-10-04 日本電気株式会社 磁気記録媒体用潤滑剤、磁気記録媒体及び磁気記録装置
US6589641B1 (en) 1998-06-04 2003-07-08 Seagate Technology Llc Thin films of crosslinked fluoropolymer on a carbon substrate
US6617011B2 (en) * 1999-05-07 2003-09-09 Seagate Technology Llc Elastomeric lubricants for magnetic recording media
US6680079B1 (en) * 2000-06-02 2004-01-20 Seagate Technology Llc Planarization and corrosion protection of patterned magnetic media
US6673429B1 (en) 2000-07-25 2004-01-06 Seagate Technology Llc Magnetic recording media with a multiple-layer lubricant
US6638622B2 (en) * 2001-01-11 2003-10-28 Hitachi Global Storage Technologies Perfluorinated polyethers with metal carboxylate end groups as anti-wetting and corrosion-protective agents
US6849304B1 (en) 2001-03-16 2005-02-01 Seagate Technology Llc Method of forming lubricant films
US6753060B1 (en) 2001-05-04 2004-06-22 Seagate Technology Llc Method for improving performance of thin film recording media and media obtained thereby
WO2003102500A1 (fr) * 2002-06-04 2003-12-11 Olympus Corporation Procede d'obtention de coordonnees 3 d
KR100646557B1 (ko) * 2002-06-27 2006-11-14 티디케이가부시기가이샤 복합 하드 코트층이 부여된 물체 및 복합 하드 코트층의형성방법
US20050037932A1 (en) * 2003-08-15 2005-02-17 Jianwei Liu Ultra-thin lubricant film for advanced tribological performance of magnetic storage media
US7060377B2 (en) * 2003-10-20 2006-06-13 Seagate Technology Lubricant film containing additives for advanced tribological performance of magnetic storage medium
KR102005840B1 (ko) 2003-12-19 2019-07-31 더 유니버시티 오브 노쓰 캐롤라이나 엣 채플 힐 소프트 또는 임프린트 리소그래피를 이용하여 분리된 마이크로- 및 나노- 구조를 제작하는 방법
JP4661140B2 (ja) * 2004-09-07 2011-03-30 旭硝子株式会社 撥水撥油剤用溶液組成物、基材およびその製造方法
WO2006102592A1 (en) * 2005-03-24 2006-09-28 3M Innovative Properties Company Metallized films and articles containing the same
JP2008534317A (ja) * 2005-03-24 2008-08-28 スリーエム イノベイティブ プロパティズ カンパニー 耐食金属化フィルムおよびその製造方法
KR101439538B1 (ko) * 2007-08-14 2014-09-12 삼성전자주식회사 보호막 형성용 조성물 및 이에 의한 보호막을 포함한유기박막 트랜지스터
US8512935B2 (en) * 2009-05-08 2013-08-20 Hewlett-Packard Development Company, L.P. Functionalized perfluoropolyether material as a hydrophobic coating
US10539405B2 (en) 2015-12-24 2020-01-21 Cosimo Fuda Jig of spirit level clamping aid tools, squares and hand clamps
WO2018139058A1 (ja) * 2017-01-26 2018-08-02 昭和電工株式会社 含フッ素エーテル化合物、磁気記録媒体用潤滑剤および磁気記録媒体
CN111032625B (zh) 2017-08-21 2022-12-09 昭和电工株式会社 含氟醚化合物、磁记录介质用润滑剂和磁记录介质
US11261394B2 (en) * 2017-09-13 2022-03-01 Showa Denko K.K. Fluorine-containing ether compound, lubricant for magnetic recording media, and magnetic recording medium
US11180457B2 (en) * 2017-10-31 2021-11-23 Showa Denko K. K. Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium
US11655330B2 (en) 2017-12-04 2023-05-23 Daikin America, Inc. Article including a substrate, a phosphate binding layer and a fluoroplyether layer
US11767483B2 (en) 2018-09-12 2023-09-26 Resonac Corporation Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium
JP7435589B2 (ja) 2019-03-12 2024-02-21 株式会社レゾナック 含フッ素エーテル化合物、磁気記録媒体用潤滑剤および磁気記録媒体
US11879109B2 (en) 2019-09-18 2024-01-23 Resonac Corporation Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium
JPWO2021132252A1 (xx) 2019-12-26 2021-07-01
US20240240097A1 (en) * 2023-01-04 2024-07-18 Western Digital Technologies, Inc. Fluorinated media lubricants with reduced hydrocarbon fraction for data storage devices

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2941912A (en) * 1953-03-24 1960-06-21 Pittsburgh Plate Glass Co Surface treatment of halogenated fluoroethylenes and laminates thereof
US2994632A (en) * 1958-01-21 1961-08-01 Goodrich Co B F Laminated compositions and method for their preparation
US2979418A (en) * 1958-03-03 1961-04-11 Minnesota Mining & Mfg Chemically resistant coatings and method for preparation thereof
US3066112A (en) * 1959-01-30 1962-11-27 Rafael L Bowen Dental filling material comprising vinyl silane treated fused silica and a binder consisting of the reaction product of bis phenol and glycidyl acrylate
US3380974A (en) * 1964-10-30 1968-04-30 Du Pont Tetrafluoroethylene, isobutylene, carboxylic copolymers
US3470014A (en) * 1966-11-23 1969-09-30 Pennsalt Chemicals Corp Substrates coated with pigmented acrylate coating and a fluorocarbon topcoat
US4094911A (en) * 1969-03-10 1978-06-13 Minnesota Mining And Manufacturing Company Poly(perfluoroalkylene oxide) derivatives
US3778308B1 (en) * 1970-12-18 1991-06-04 Magnetic storage device coating and process
US3919719A (en) * 1974-04-04 1975-11-11 Iit Res Inst Surface lubrication of magnetic media
GB1569021A (en) * 1976-03-17 1980-06-11 Kuraray Co Adhesive cementing agents containing partial phosphonic orphosphonic acid esters
JPS5891B2 (ja) * 1977-09-30 1983-01-05 俊一 岩崎 磁気記録媒体
US4188434A (en) * 1978-05-15 1980-02-12 Storage Technology Corporation Lubricant for a magnetic member
US4268556A (en) * 1979-01-08 1981-05-19 Minnesota Mining And Manufacturing Company Rigid magnetic recording disks lubricated with fluorinated telechelic polyether
US4267238A (en) * 1979-12-18 1981-05-12 Minnesota Mining And Manufacturing Company Flexible magnetic recording media lubricated with fluorinated telechelic polyether polymer
US4321404A (en) * 1980-05-20 1982-03-23 Minnesota Mining And Manufacturing Company Compositions for providing abherent coatings
JPS57135442A (en) * 1981-02-16 1982-08-21 Fuji Photo Film Co Ltd Magnetic recording medium and its manufacture
JPS57154648A (en) * 1981-03-20 1982-09-24 Hitachi Maxell Ltd Magnetic recording medium
US4404247A (en) * 1982-07-02 1983-09-13 Minnesota Mining And Manufacturing Company Protective covering for magnetic recording medium
US4569962A (en) * 1983-09-19 1986-02-11 Minnesota Mining And Manufacturing Company Perfluoropolyether compositions which are soluble in non-fluorinated solvents

Also Published As

Publication number Publication date
EP0140582B1 (en) 1989-08-02
MX167249B (es) 1993-03-11
JPH0740354B2 (ja) 1995-05-01
ATE45236T1 (de) 1989-08-15
EP0140582A3 (en) 1987-06-03
KR850003024A (ko) 1985-05-28
AU564966B2 (en) 1987-09-03
ZA846198B (en) 1985-05-29
AU3167484A (en) 1985-04-18
DE3479260D1 (en) 1989-09-07
EP0140582A2 (en) 1985-05-08
JPS60101717A (ja) 1985-06-05
US4526833A (en) 1985-07-02
CA1225546A (en) 1987-08-18
KR930002485B1 (ko) 1993-04-02

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