GB1448457A - Magnetic recording media - Google Patents

Magnetic recording media

Info

Publication number
GB1448457A
GB1448457A GB5279073A GB5279073A GB1448457A GB 1448457 A GB1448457 A GB 1448457A GB 5279073 A GB5279073 A GB 5279073A GB 5279073 A GB5279073 A GB 5279073A GB 1448457 A GB1448457 A GB 1448457A
Authority
GB
United Kingdom
Prior art keywords
derived
diisocyanate
magnetic
polyurethane
magnetic recording
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
GB5279073A
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of GB1448457A publication Critical patent/GB1448457A/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
    • G11B5/702—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 bonding agent
    • G11B5/7021—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 bonding agent containing a polyurethane or a polyisocyanate
    • G11B5/7022—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 bonding agent containing a polyurethane or a polyisocyanate containing mixtures of polyurethanes or polyisocyanates with other polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
    • C08L75/04—Polyurethanes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

1448457 Magnetic recording media BASF AG 14 Nov 1973 [15 Nov 1972] 52790/73 Headings C3P and C3R A magnetic recording medium has a non- magnetic base and a coating comprising a magnetic pigment and a binder containing 30-90% by weight of a polyurethane substantially free of isocyanate groups and soluble in a volatile organic solvent, derived from a linear aliphatic polyester or polyether, and a C 6-24 diisocyanate, and 10-70% by weight of a copolymer of at least 50% vinyl chloride and 5-50% of a monoester of a C 2-4 aliphatic diol and (meth)- acrylic acid. Preferably the polyurethane is formed from a polyester derived from aliphatic C 4-6 dicarboxylic acids and C 4-10 aliphatic diol, or from a polyether derived from a C 3-6 aliphatic diol or a C 3-6 cyclic ether. Optionally a polyisocyanate may be added to the magnetic layer. In examples the polyurethane is derived from adipic acid, 1,4-butanediol, and diphenylmethane-4,4<SP>1</SP>-diisocyanate or from polyoxytetramethylene, diphenylmethane - 4,41 - diisocyanate, and 1,4-butanediol; the copolymer is formed from vinyl chloride with propanediol monoacrylate; the magnetic pigment is acicular γ-iron(III) oxide and an isocyanate formed from 1,1,1-trimethylolpropane and toluylene diisocyanate may also be added. The coating compositions are prepared in a mixture of tetrahydrofuran and dioxane, the compositions also containing lecithin and polydimethyl siloxane.
GB5279073A 1972-11-15 1973-11-14 Magnetic recording media Expired GB1448457A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2255802A DE2255802C3 (en) 1972-11-15 1972-11-15 Layer magnetogram carrier

Publications (1)

Publication Number Publication Date
GB1448457A true GB1448457A (en) 1976-09-08

Family

ID=5861711

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5279073A Expired GB1448457A (en) 1972-11-15 1973-11-14 Magnetic recording media

Country Status (7)

Country Link
JP (1) JPS5633774B2 (en)
BE (1) BE807421A (en)
CA (1) CA1010309A (en)
DE (1) DE2255802C3 (en)
FR (1) FR2206547B1 (en)
GB (1) GB1448457A (en)
IT (1) IT996447B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2442762C2 (en) * 1974-09-06 1983-02-24 Basf Ag, 6700 Ludwigshafen Layered magnetogram carrier with polyurethane elastomer binders in the magnetic layer
FR2446855A1 (en) * 1979-01-19 1980-08-14 Minnesota Mining & Mfg COATING OF FINE PARTICLES IN A POLYURETHANE SEQUENCE COPOLYMER BINDER AND MAGNETIC RECORDING MEDIUM COMPRISING SUCH A COATING
DE3127884A1 (en) * 1981-07-15 1983-02-03 Agfa-Gevaert Ag, 5090 Leverkusen MAGNETIC STORAGE MEDIUM
JPS6032142U (en) * 1983-08-12 1985-03-05 株式会社クボタ Headlight structure of reaping harvester
DE3341698A1 (en) * 1983-11-18 1985-05-30 Basf Ag, 6700 Ludwigshafen MAGNETIC RECORDING CARRIERS
DE3341699A1 (en) * 1983-11-18 1985-05-30 Basf Ag, 6700 Ludwigshafen MAGNETIC RECORDING CARRIERS

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899411A (en) * 1956-07-30 1959-08-11 Polyurethane elastomers from hy-
DE1130612B (en) * 1961-01-03 1962-05-30 Agfa Ag Process for the production of layered magnetic memories for sound, image and pulse recording
NL126092C (en) * 1962-10-15 1900-01-01
DE1906548A1 (en) * 1968-02-12 1969-09-18 Fuji Photo Film Co Ltd Magnetic recording medium
DE2101490C3 (en) * 1971-01-14 1978-04-13 Basf Ag, 6700 Ludwigshafen Magnetic cards for data acquisition

Also Published As

Publication number Publication date
BE807421A (en) 1974-05-16
IT996447B (en) 1975-12-10
FR2206547A1 (en) 1974-06-07
CA1010309A (en) 1977-05-17
JPS4982307A (en) 1974-08-08
DE2255802A1 (en) 1974-05-22
FR2206547B1 (en) 1977-06-03
DE2255802B2 (en) 1981-01-22
DE2255802C3 (en) 1981-10-15
JPS5633774B2 (en) 1981-08-06

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee