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GB1161068A - Magnetic Coating Composition - Google Patents

Magnetic Coating Composition

Info

Publication number
GB1161068A
GB1161068A GB4949666A GB4949666A GB1161068A GB 1161068 A GB1161068 A GB 1161068A GB 4949666 A GB4949666 A GB 4949666A GB 4949666 A GB4949666 A GB 4949666A GB 1161068 A GB1161068 A GB 1161068A
Authority
GB
United Kingdom
Prior art keywords
dispersion
methyl ethyl
ethyl ketone
solution
mixed
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB4949666A
Inventor
Kengo Matsumoto
Hiroshi Kawai
Sadao Shiibashi
Etsuko Hamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Publication of GB1161068A publication Critical patent/GB1161068A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/7013—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the dispersing agent

Landscapes

  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

1161068 Magnetic compositions SONY CORP 4 Nov 1966 [6 Nov 1965] 49496/66 Index C3B B1 L4H C21 C8R C8B C6X C8P C11 L6G C1 C25 C12 C27 L5X. Index C3R 32 L4H C21 C8R C8B C6X C8P C11 L6G C1 C25 C12 C27 L5X A magnetic coating composition is prepared by dispersing magnetic pigment particles in a vehicle comprising an additive having a dispersing action for the pigment and containing an atomic grouping with active hydrogen or a carboxylic acid group, to form a dispersion, and adding to the dispersion a material capable of reacting with the additive to form a cured epoxy, urethane or urea resin or a mixture or compound of two or more of these resins. The vehicle preferably comprises also a polymeric binder which does not contain active hydrogen atoms or a carboxylic acid anhydride group. In typical Examples, (1) red Hematite is mixed with a polyoxyaminodiol, a vinyl chloride-vinyl acetate copolymer, dioctyl phthalate and methyl ethyl ketone to form a dispersion to which is added a tolylene diisocyanate/methyl ethyl ketone solution, the resulting solution being coated on to the base of a magnetic recording medium; (2) iron oxide of a Fe-Co alloy powder is mixed with a primaryl alkylamine, vinyl chloride-vinyl acetate copolymer, toluene and methyl ethyl ketone to form a dispersion to which is added a second solution comprising ditolylene diisocyanate and methyl ethyl ketone to form a urea resin: (3) iron oxide, diethylene triamine, a vinyl chloridevinyl acetate copolymer, dibutyl phthalate and methyl isobutyl ketone are mixed to form a dispersion to which is added a solution of an epoxy resin in methyl ethyl ketone. Other examples are specified.
GB4949666A 1965-11-06 1966-11-04 Magnetic Coating Composition Expired GB1161068A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6794865 1965-11-06

Publications (1)

Publication Number Publication Date
GB1161068A true GB1161068A (en) 1969-08-13

Family

ID=13359660

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4949666A Expired GB1161068A (en) 1965-11-06 1966-11-04 Magnetic Coating Composition

Country Status (2)

Country Link
DE (1) DE1669301A1 (en)
GB (1) GB1161068A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074012A (en) 1973-01-02 1978-02-14 Minnesota Mining And Manufacturing Company Fine-metal-particle-based magnetic recording medium of improved environmental stability
FR2376196A1 (en) * 1976-12-31 1978-07-28 Philips Nv MAGNETIC RECORDING FLUID, LUBRICANTS USED IN THIS FLUID AND METHOD FOR PREPARING LUBRICANTS

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074012A (en) 1973-01-02 1978-02-14 Minnesota Mining And Manufacturing Company Fine-metal-particle-based magnetic recording medium of improved environmental stability
FR2376196A1 (en) * 1976-12-31 1978-07-28 Philips Nv MAGNETIC RECORDING FLUID, LUBRICANTS USED IN THIS FLUID AND METHOD FOR PREPARING LUBRICANTS

Also Published As

Publication number Publication date
DE1669301A1 (en) 1971-03-18

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Legal Events

Date Code Title Description
PS Patent sealed
PE Patent expired