GB1324795A - Magnetic recording element - Google Patents

Magnetic recording element

Info

Publication number
GB1324795A
GB1324795A GB5033270A GB5033270A GB1324795A GB 1324795 A GB1324795 A GB 1324795A GB 5033270 A GB5033270 A GB 5033270A GB 5033270 A GB5033270 A GB 5033270A GB 1324795 A GB1324795 A GB 1324795A
Authority
GB
United Kingdom
Prior art keywords
magnetic
magnetic recording
cro
recording element
binder
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
GB5033270A
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.)
RCA Corp
Original Assignee
RCA 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 RCA Corp filed Critical RCA Corp
Publication of GB1324795A publication Critical patent/GB1324795A/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
    • 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
    • G11B5/706—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 composition of the magnetic material
    • G11B5/70626—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 composition of the magnetic material containing non-metallic substances
    • G11B5/70636—CrO2

Landscapes

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

Abstract

1324795 Magnetic recording medium RCA CORPORATION 22 Oct 1970 [31 Oct 1969] 50332/70 Heading H1H A magnetic recording element comprises a non-magnetic substrate bearing a magnetic coating comprising magnetic chromium dioxide particles dispersed in a polymeric binder, the specific surface area of the CrO 2 being 5-30 m.<SP>2</SP>/g., and the chemical structure of the binder being such that the reactivity rate constant at 120‹ C. of the CrO 2 with the binder is not more than 4 x 10<SP>-4</SP> hrs.<SP>-1</SP>. The reactivity rate constant (k) is defined as A<SP>2</SP>/2t, where A=fractional decrease in magnetic recording element retentivity. Suitable binders (which do not have H atoms available for reaction with CrO 2 to form deleterious CrOOH) are polycarbonates, vinylidene fluoride/hexafluoropropylene copolymers and polymers of formula where R is an aliphatic radical. The magnetic composition may be applied to the substrate (e.g. polyethylene terephthalate) in a solvent, and magnetically orientated before hardening by removal of solvent.
GB5033270A 1969-10-31 1970-10-22 Magnetic recording element Expired GB1324795A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US87287669A 1969-10-31 1969-10-31

Publications (1)

Publication Number Publication Date
GB1324795A true GB1324795A (en) 1973-07-25

Family

ID=25360502

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5033270A Expired GB1324795A (en) 1969-10-31 1970-10-22 Magnetic recording element

Country Status (5)

Country Link
JP (1) JPS493566B1 (en)
DE (1) DE2052075A1 (en)
FR (1) FR2066708A5 (en)
GB (1) GB1324795A (en)
NL (1) NL7015937A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2556188C3 (en) * 1975-12-13 1979-07-05 Basf Ag, 6700 Ludwigshafen Flexible multilayer magnetogram carriers
JPS5430787U (en) * 1977-08-02 1979-02-28

Also Published As

Publication number Publication date
DE2052075A1 (en) 1971-05-06
JPS493566B1 (en) 1974-01-26
NL7015937A (en) 1971-05-04
FR2066708A5 (en) 1971-08-06

Similar Documents

Publication Publication Date Title
US3387993A (en) Magnetic tape with a lubricant containing mineral oil and fatty acid amide in the magnetic coating
GB1497891A (en) Magnetic recording media
JPS6111924A (en) Magnetic recording medium
GB1320779A (en) Magnetic coating formulation for recording tape
GB1498165A (en) Magnetic recording media
US3242005A (en) High density magnetic recording medium
GB977797A (en) Improved wear-resistant recording medium
US3262124A (en) Transducing system
JPS5744227A (en) Magnetic recording medium
JPS567233A (en) Magnetic recording medium
GB1244109A (en) Magnetic recording medium
GB999385A (en) Magnetic recording element
GB1324795A (en) Magnetic recording element
JPS5573928A (en) Magnetic recording medium
GB1403204A (en) Magnetic recording media and a process for their production
GB671269A (en) Improvements in or relating to multi-layer magnetic record members
GB1271730A (en) Magnetic recording medium
GB985859A (en) Improvements in or relating to magnetic recording apparatus
GB1203600A (en) Magnetic tapes
JPS56105338A (en) Magnetic card having forgery preventing function
GB1248504A (en) Magnetic recording element
US3595694A (en) Magnetic recording tape
ES383572A1 (en) Magnetic ledger cards and a method for forming the same
JPS52106500A (en) Magnetic recording medium
GB1237978A (en)

Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees