GB1237978A - - Google Patents

Info

Publication number
GB1237978A
GB1237978A GB1237978DA GB1237978A GB 1237978 A GB1237978 A GB 1237978A GB 1237978D A GB1237978D A GB 1237978DA GB 1237978 A GB1237978 A GB 1237978A
Authority
GB
United Kingdom
Prior art keywords
specified
acid ester
cyanic acid
magnetic
trimer
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
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 filed Critical
Publication of GB1237978A publication Critical patent/GB1237978A/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
    • G11B5/7023—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 polyesters, polyethers, silicones, polyvinyl resins, polyacrylresins or epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/83—Chemically modified polymers
    • C08G18/833—Chemically modified polymers by nitrogen containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/0622—Polycondensates containing six-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms
    • C08G73/0638—Polycondensates containing six-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms with at least three nitrogen atoms in the ring
    • C08G73/065—Preparatory processes
    • C08G73/0655—Preparatory processes from polycyanurates
    • 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

Landscapes

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

Abstract

1,237,978. Magnetic recording medium. AGFA - GEVAERT - A.G. 12 Aug., 1969 [16 Aug., 1968], No. 40211/69. Heading H1H. A magnetic recording medium comprises a rigid or flexible support e.g. a tape, card or disc, bearing a layer including a magnetizable pigment and, as a binder, a polymer derived from a bifunctional or polyfunctional cyanic acid ester. The polymer may be made by curing a trimer of the cyanic acid ester or by reacting the ester of its trimer with a compound containing -OH or -NH 2 groups, which may itself be polymeric e.g. vinyl chloride/acetate copolymer containing -OH groups. A specified cyanic acid ester is 2,2-bis(4 - cyanatophenyl)- propane. Specified magnetic materials are iron and chromium oxides, ferrites, iron, cobalt and Fe-Ni-Co alloy. Metal, polymeric and paper substrates are specified. The magnetic composition may be cast on to the substrate, and cured by heating. A smooth surface may be obtained by calendering or by grinding and polishing. An adhesive layer between the substrate and magnetic layers may be used, e.g. vinylidene chloride/acrylonitrile copolymer.
GB1237978D 1968-08-16 1969-08-12 Expired GB1237978A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681774681 DE1774681A1 (en) 1968-08-16 1968-08-16 Magnetic layer storage with binders containing cyanate ester

Publications (1)

Publication Number Publication Date
GB1237978A true GB1237978A (en) 1971-07-07

Family

ID=5702228

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1237978D Expired GB1237978A (en) 1968-08-16 1969-08-12

Country Status (5)

Country Link
BE (1) BE737568A (en)
DE (1) DE1774681A1 (en)
FR (1) FR2019348A1 (en)
GB (1) GB1237978A (en)
NL (1) NL6912461A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2620423B2 (en) * 1976-05-08 1978-06-22 Stopinc Ag, Zug (Schweiz) Slide plate unit for slide gate locks

Also Published As

Publication number Publication date
DE1774681A1 (en) 1972-01-05
NL6912461A (en) 1970-01-26
FR2019348A1 (en) 1970-07-03
BE737568A (en) 1970-02-18

Similar Documents

Publication Publication Date Title
GB1497891A (en) Magnetic recording media
GB1488483A (en) Credit cards and other security documents
GB1498165A (en) Magnetic recording media
US3242005A (en) High density magnetic recording medium
ES423486A1 (en) Magnetic head devices enclosed by a shield having superposed layers and an intervening layer of solder
GB1244109A (en) Magnetic recording medium
JPS62241130A (en) Magnetic recording medium
GB1275031A (en) Magnetic recording mediums
US3922439A (en) Magnetic recording media
GB1237978A (en)
GB1290834A (en)
GB1260873A (en) Improvements in or relating to magnetic recording media
GB1363448A (en) Magnetic recording material
GB1232337A (en)
JPS5750327A (en) Magnetic recording medium
GB1427731A (en) Magnetic recording media and to methods for their production
ES383572A1 (en) Magnetic ledger cards and a method for forming the same
GB1366192A (en) Dual-layer magnetic recording tape
JPS6222170B2 (en)
GB1247065A (en) Magnetic recording medium
GB902838A (en) A process for the production of magnetic recording media
JPS5737720A (en) Magnetic recording medium and its manufacture
JPS6381623A (en) Disk medium
JPH06195702A (en) Magnetic recording medium and its manufacture
JPS60195738A (en) Manufacture of magnetic disk

Legal Events

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