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1. EP0074410 - MAGNETIC RECORDING MEDIUM

Office
European Patent Office
Application Number 82900988
Application Date 17.03.1982
Publication Number 0074410
Publication Date 23.03.1983
Publication Kind B1
IPC
C09D 5/23
CCHEMISTRY; METALLURGY
09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
DCOATING 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
5Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
23Magnetisable or magnetic paints or lacquers
C09D 7/12
CCHEMISTRY; METALLURGY
09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
DCOATING 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
7Features of coating compositions, not provided for in group C09D5/88; Processes for incorporating ingredients in coating compositions
12Other additives
G11B 5/706
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
62Record carriers characterised by the selection of the material
68comprising one or more layers of magnetisable particles homogeneously mixed with a bonding agent
70on a base layer
706characterised by the composition of the magnetic material
CPC
G11B 5/706
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
62Record carriers characterised by the selection of the material
68comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
70on a base layer
706characterised by the composition of the magnetic material
Y10S 428/90
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
428Stock material or miscellaneous articles
90Magnetic feature
Y10T 428/256
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
428Stock material or miscellaneous articles
25Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
256Heavy metal or aluminum or compound thereof
Y10T 428/31609
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
428Stock material or miscellaneous articles
31504Composite [nonstructural laminate]
31551Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
31609Particulate metal or metal compound-containing
Y10T 428/31935
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
428Stock material or miscellaneous articles
31504Composite [nonstructural laminate]
31855Of addition polymer from unsaturated monomers
31935Ester, halide or nitrile of addition polymer
Applicants SONY CORPORATION
Inventors CHUBACHI, RYOJI SONY MAGNETIC PRODUCTS INC.
KAWAMURA, YOSHIHISA SONY MAGNETIC PRODUCTS INC.
SOMEZAWA, MASASHI SONY MAGNETIC PRODUCTS INC.
Designated States
Priority Data 1981040202 19.03.1981 JP
Title
(DE) MAGNETISCHES AUFNAHMEMEDIUM.
(EN) MAGNETIC RECORDING MEDIUM
(FR) SUPPORT D'ENREGISTREMENT MAGNETIQUE.
Abstract
(EN) Magnetic recording medium having a magnetic layer containing ferromagnetic alloy powder as a magnetic recording medium for recording short wavelengths, for example, in a video tape recorder. The relative surface area BET of the ferromagnetic alloy powder is set to larger than 45m2/g with the coercive force of the magnetic layer being higher than 1000 Oe., and the central recording wavelength may be high density recording less than 1 $g(u)m, thereby enabling low noise and high power recording and reproduction.
(FR) Support d'enregistrement magnetique ayant une couche magnetique contenant une poudre d'un alliage ferromagnetique en tant que support d'enregistrement magnetique pour enregistrer des longueurs d'ondes courtes, par exemple dans un enregistreur a bande video. La surface specifique BET de la poudre d'alliage ferromagnetique est determinee a une valeur superieure a 45m2/g avec la force coercive de la couche magnetique superieure a 1000Oe, et la longueur d'onde d'enregistrement centrale peut permettre un enregistrement de haute densite inferieure a 1(Alpha)m, permettant ainsi un enregistrement et une reproduction a faible bruit et haute puissance.
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