WO1996000440A1 - Support d'enregistrement - Google Patents

Support d'enregistrement Download PDF

Info

Publication number
WO1996000440A1
WO1996000440A1 PCT/GB1995/001463 GB9501463W WO9600440A1 WO 1996000440 A1 WO1996000440 A1 WO 1996000440A1 GB 9501463 W GB9501463 W GB 9501463W WO 9600440 A1 WO9600440 A1 WO 9600440A1
Authority
WO
WIPO (PCT)
Prior art keywords
substrate
recording medium
layer
medium according
recording
Prior art date
Application number
PCT/GB1995/001463
Other languages
English (en)
Inventor
Malcolm Ronald Deex
Hazel Watson
Original Assignee
Imperial Chemical Industries Plc
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
Priority to APAP/P/1996/000868A priority Critical patent/AP9600868A0/en
Application filed by Imperial Chemical Industries Plc filed Critical Imperial Chemical Industries Plc
Publication of WO1996000440A1 publication Critical patent/WO1996000440A1/fr

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/254—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers
    • G11B7/2542—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers consisting essentially of organic resins
    • G11B7/2545—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers consisting essentially of organic resins containing inorganic fillers, e.g. particles or fibres
    • 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
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/735—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the back layer
    • G11B5/7356—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the back layer comprising non-magnetic particles in the back layer, e.g. particles of TiO2, ZnO or SiO2
    • 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
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73923—Organic polymer substrates
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
    • G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
    • G11B7/2535—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins polyesters, e.g. PET, PETG or PEN
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/254—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers
    • G11B7/2542—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers consisting essentially of organic resins
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
    • G11B7/2585—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on aluminium

Definitions

  • This invention relates to recording media such as are used to record information in a form which enables it to be read back by means of a read device.
  • Such media in general comprise a polymeric substrate having on one side thereof a layer of recording material which may take a variety of forms, including magnetic, magneto-optical or optical recording materials.
  • Recording media are usually provided with a back coat, ie on the opposite side of the substrate to the recording layer, in order to impart desired handling and frictional properties to that side of the substrate.
  • the back coat layer in general has comprised a layer of plastics material with a hard, inorganic filler, eg silica with a size of the order of 1 to 10 ⁇ m inco ⁇ orated therein so that the filler particles impart a surface texture or roughness to that side of the substrate.
  • the back coat for optical recording media can be formed of a layer of cured material comprising a polymer wherein the surface texture is imparted by the polymer itself.
  • the back coat gives a high static friction coefficient in the region of 1. This value is satisfactory and is compatible with the required handling properties for the reel to reel tape drives and 75 ⁇ m substrate currently in use.
  • a recording medium having a back coat which has a friction coefficient low enough to allow slippage and which is softer and thus less likely to damage the recording layer than the conventional types containing inorganic filler particles.
  • a recording medium comprising a polymeric substrate, a recording layer on one side of the substrate and a textured backcoat on the opposite side of the substrate, the backcoat layer comprising carbon black, a binder resin and a hyperdispersant.
  • hyperdispersant is defined as meaning a polymeric material having an anchor group capable of being absorbed on to the surface of a particle in a colloidal system and polymeric chains giving steric stabilisation so as to hold the particles apart. Further information on hyperdispersants may be obtained by reference to the paper presented by J.D.Schofield of ICI Specialties Research Centre at PRA Seminar on Paint Additives, Teddington, March 1991 and published in pages 204 to 210 of JOCCA 1991(6).
  • the carbon black has a particle size in the range 0.5 ⁇ m to 0.9 ⁇ m.
  • the hyperdispersant is an eicosa(propoxy)deca(ethoxy)diethylamine or a mixture of a poly(polycaprolactone)-polyethyleneimine and a diocta decyldimethylammonium copper phthalocyanine-sulpho.
  • the resin may be a polyurethane, preferably a uv curable, aliphatic polyurethane with acrylic end groups.
  • the back coat of the invention has the advantage that carbon black which is a relatively soft filler can be used.
  • carbon black does not easily form a stable dispersion in a resin/solvent medium and the presence of the hyperdispersant is essential for this purpose.
  • the invention is illustrated by reference to the accompanying drawing which shows a diagrammatic sectional view through an optical recording medium having a back coat applied thereto.
  • the optical recording medium illustrated is in a form suitable for use as a flexible optical tape.
  • the medium comprises a flexible substrate 10 which is coated on one face with a subbing or smoothing layer 12.
  • a thin layer 15 of reflective material eg a metal such as aluminium is applied to the smooth surface of the subbing layer 12 to provide a surface which is highly reflective with respect to the wavelength used for writing into and reading from the medium.
  • An amorphous recording layer 18, comprising, for example, a dye, such as is disclosed in US Patent 4606859, combined with an amorphous, polyester, thermoplastic binder resin, is coated over the reflecting layer 15.
  • the reverse face of the substrate is coated with a back coat 13.
  • the substrate 10 is formed from a 23 ⁇ m thick, biaxially oriented, polyethylene terephthalate film of Melinex ( a registered trademark of ICI Pic) and has sufficient flexibility to function, when coated with the layers 12, 13, 15, 18 and 20, as a flexible optical tape medium which may be wound up on a spool.
  • Data is written on to the tape by moving it relative to an optical recording head operable in writing or reading modes using a laser beam adjusted to higher or lower power levels according to the mode of operation, recording being effected with increased power and read back with reduced power.
  • the laser beam is focused through the overcoat layer on to the recording layer so as to form pits, representing binary information, in the recording layer.
  • the recording layer may be of the metallic alloy type as disclosed in EP 224313 where information is recorded by effecting a phase change.
  • IRGACURE 907 0.43 was prepared as follows. The Solsperse 5000 and 24000 were dissolved in the toluene, 1.96 parts of the Ebecryl 5129 and the Monarch 1000 added and the mixture stirred for 30 minutes in a high speed disperser before being placed in a bead mill where it was milled for 4 hours until the maximum particle size was 0.75 ⁇ m. 4.44 parts of Ebecryl were then added and the mixture milled for a further 10 minutes.
  • the mixture was replaced in the high speed disperser and the remainder of the Ebecryl added. Mixing was carried out for ten minutes before the acetone was slowly added over 10 minutes and then the methanol over 5 minutes. The dispersion was stable for over 4 weeks whereas a similar dispersion without the Solsperse hyperdispersants settled out within 2 hours.
  • SOLSPERSE 5000 is a dioctadecyldimethylammonium copper phthalocyanine-sulpho available from ZENECA.
  • SOLSPERSE 24000 is a poly(polycaprolactone)-polyethyle ⁇ eimine available from ZENECA.
  • EBECRYL 5129 is a UV curable aliphatic polyurethane with reactive acrylic end groups available from UCB Chemicals.
  • MONARCH 1000 is a furnace type carbon black having an average particle size of 1.6 ⁇ m available from Cabot.
  • UVECRYL P115 is an amino acrylate available from UCB Chemicals.
  • IRGACURE 907 is a 2-methyl-1- ⁇ (4-methylthio)phenyl ⁇ -2-morpholino-propanone available from Ciba Geigy.
  • Example 2 A resin stock was prepared by dissolving 1280g of EBECRYL 5129 in a mixture of 1440g of acetone and 480 g of methanol. From this resin stock, a mill base was prepared by adding 18.7g of SOLSPERSE 20000 to 250g of the stock and mixing for 15 minutes in a high speed disperser, adding 94.3 g of Degussa Special Black 4 and further mixing for 15 minutes. the mill base was added slowly and stirring continued for 15 minutes. 42g of IRGACURE 907 was then added and stirring continued for 10 minutes.
  • the stability of the resulting dispersion was similar to that of the dispersion of Example 1 , although the energy requirements for preparation were significantly lower as no milling was required..
  • SOLSPERSE 20000 is an eicosa(propoxy)deca(ethoxy)diethylamine available from ZENECA
  • SPECIAL BLACK 4 is a Channel type carbon black having an average particle size of 2.5 ⁇ m available from Degussa.
  • Example 1 The dispersion of Example 1 was bead coated on to one face of a 23 ⁇ m Melinex substrate, and dried in an oven at 85 °C for approximately 6 seconds. The dried coating was cured by one pass at 20 mpm under two focussed 300W/inch (118W/cm) medium pressure mercury arc lamps. The cured coating thickness was approximately 0.5 ⁇ m.
  • the other face of the substrate was coated with a smoothing layer, an aluminium relective layer, a dye/binder layer and a sub-micron overcoat layer to form an optical data storage medium as shown in the drawing.
  • the static friction coefficient between the back coat and the over coat was found to be 0.5 whereas the equivalent friction coefficient o ⁇ similar medium with a back coat as described in Example 1 A of EP 51 f 9 was 0.96.
  • the friction coefficients were determined using a force gauge available from Instron Ltd.
  • a 35mm x 150mm sample was attached by double sided adhesive tape to the base plate of the instrument with the back coat uppermost and a 12.5mm x 150mm sample was fixed with the overcoat lowermost in the jaws of the instrument so as to be aligned with and in contact with the larger sample.
  • a 0.17Kg weight was then placed on the upper sample and the instrument operated to draw the upper sample over the lower sample for a distance of 5mm in both directions.
  • the static coefficient of friction was calculated by dividing the maximum force by the weight.
  • the medium was slit into tapes and cycling robustness was determined by subjecting a tape to multiple cycling at a speed of 4m/s on a reel to reel tape drive. After 25,000 cycles the damage at the centre of the recording side of the tape was assessed using a microscope and an image analyser to measure the Geometric Error Rate (GER), ie the ratio of the total area of damage to the total area measured.
  • GER Geometric Error Rate
  • the GER was found to be 1 x 10 3 whereas a similar tape with the backcoat of Example 1A of EP 516929 had a GER of 3.1 x 10 3 .
  • Example 3 was repeated except that the back coat was formed from the dispersion of Example 2. Similar results were obtained.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

Couche de support conçue pour des supports d'enregistrement, en particulier des bandes de mémorisation de données optiques, composée de noir de carbone, d'une résine liante et d'un agent hyperdispersant. Ladite couche confère des caractéristiques de friction plus appropriées au substrat plus mince (23νm) utilisé pour des cassettes que les couches de support de l'état actuel de la technique utilisées pour le substrat de 75νm des entraînements à deux bobines.
PCT/GB1995/001463 1994-04-23 1995-06-21 Support d'enregistrement WO1996000440A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
APAP/P/1996/000868A AP9600868A0 (en) 1994-04-23 1995-04-19 Polymer coated tablet comprising amoxycillin and clavulanate.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9412584A GB9412584D0 (en) 1994-06-23 1994-06-23 Recording media
GB9412584.6 1994-06-23

Publications (1)

Publication Number Publication Date
WO1996000440A1 true WO1996000440A1 (fr) 1996-01-04

Family

ID=10757187

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/001463 WO1996000440A1 (fr) 1994-04-23 1995-06-21 Support d'enregistrement

Country Status (2)

Country Link
GB (1) GB9412584D0 (fr)
WO (1) WO1996000440A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6762157B1 (en) 2000-07-31 2004-07-13 S. C. Johnson & Son, Inc. Low residue surface treatment
WO2011076948A1 (fr) 2009-12-24 2011-06-30 Shell Internationale Research Maatschappij B.V. Compositions de carburant liquide
WO2011076949A1 (fr) 2009-12-24 2011-06-30 Shell Internationale Research Maatschappij B.V. Compositions de carburant liquide
WO2012163935A2 (fr) 2011-05-30 2012-12-06 Shell Internationale Research Maatschappij B.V. Compositions de carburants liquides

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0322826A1 (fr) * 1987-12-28 1989-07-05 Konica Corporation Milieux d'enregistrement magnétique
EP0464827A2 (fr) * 1990-07-05 1992-01-08 Matsushita Electric Industrial Co., Ltd. Support d'enregistrement magnétique et sa méthode de fabrication
US5151333A (en) * 1989-08-07 1992-09-29 Nippon Zeon Co., Ltd Magnetic recording medium comprising a magnetic layer or backcoat layer containing a specified dispersant
EP0519629A1 (fr) * 1991-06-11 1992-12-23 Imperial Chemical Industries Plc Supports d'enregistrement
EP0551072A1 (fr) * 1992-01-07 1993-07-14 Diafoil Hoechst Co., Ltd Bande optique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0322826A1 (fr) * 1987-12-28 1989-07-05 Konica Corporation Milieux d'enregistrement magnétique
US5151333A (en) * 1989-08-07 1992-09-29 Nippon Zeon Co., Ltd Magnetic recording medium comprising a magnetic layer or backcoat layer containing a specified dispersant
EP0464827A2 (fr) * 1990-07-05 1992-01-08 Matsushita Electric Industrial Co., Ltd. Support d'enregistrement magnétique et sa méthode de fabrication
EP0519629A1 (fr) * 1991-06-11 1992-12-23 Imperial Chemical Industries Plc Supports d'enregistrement
EP0551072A1 (fr) * 1992-01-07 1993-07-14 Diafoil Hoechst Co., Ltd Bande optique

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6762157B1 (en) 2000-07-31 2004-07-13 S. C. Johnson & Son, Inc. Low residue surface treatment
WO2011076948A1 (fr) 2009-12-24 2011-06-30 Shell Internationale Research Maatschappij B.V. Compositions de carburant liquide
WO2011076949A1 (fr) 2009-12-24 2011-06-30 Shell Internationale Research Maatschappij B.V. Compositions de carburant liquide
WO2012163935A2 (fr) 2011-05-30 2012-12-06 Shell Internationale Research Maatschappij B.V. Compositions de carburants liquides

Also Published As

Publication number Publication date
GB9412584D0 (en) 1994-08-10

Similar Documents

Publication Publication Date Title
US5382463A (en) Data storage media
US4560616A (en) Magnetic recording medium having binder cured by electron beam radiation
US4547419A (en) Magnetic recording medium
US4780366A (en) Magnetic recording medium for image recording
EP1118980B1 (fr) Support d'enregistrement magnétique
WO1996000440A1 (fr) Support d'enregistrement
US4666754A (en) Magnetic recording medium
US4592942A (en) Magnetic recording medium
US4810435A (en) Method of making substrate for magnetic recording medium
US5576087A (en) Magneto-optical recording medium
US5073439A (en) Magnetic recording medium comprising a vinyl chloride based resin group containing an epoxy group or a polar or both and further a polyurethane resin containing three hydroxyl groups and one polar group
JP4626599B2 (ja) 磁気記録媒体
JPH0685267B2 (ja) フレキシブル磁気デイスク
EP0519629A1 (fr) Supports d'enregistrement
JPH0533447B2 (fr)
JPH0464936A (ja) 光学的記録媒体
JP2001084549A (ja) 磁気記録媒体
US20050170214A1 (en) Magnetic recording medium and method for producing the same
JP2821054B2 (ja) 磁気記録媒体及び該磁気記録媒体を装填した磁気テープカセット
JPH10134337A (ja) コンピュータデータ記録用磁気テープ
EP0598096B1 (fr) Support d'enregistrement
JP2008165841A (ja) 光記録媒体
JPH064917A (ja) 光学的記録媒体、及びその製造方法
JPH08129742A (ja) 磁気記録媒体
JPH07121919A (ja) 光学的記録媒体

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase