GB1527760A - Stabilization of chromium dioxide magnetic pigments - Google Patents

Stabilization of chromium dioxide magnetic pigments

Info

Publication number
GB1527760A
GB1527760A GB5156875A GB5156875A GB1527760A GB 1527760 A GB1527760 A GB 1527760A GB 5156875 A GB5156875 A GB 5156875A GB 5156875 A GB5156875 A GB 5156875A GB 1527760 A GB1527760 A GB 1527760A
Authority
GB
United Kingdom
Prior art keywords
chromium dioxide
stabilization
dec
silanes
magnetic pigments
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
GB5156875A
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
Priority claimed from DE19742459766 external-priority patent/DE2459766A1/en
Priority claimed from DE19752538792 external-priority patent/DE2538792A1/en
Application filed by BASF SE filed Critical BASF SE
Publication of GB1527760A publication Critical patent/GB1527760A/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
    • G11B5/706—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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/34—Compounds of chromium
    • C09C1/346—Chromium oxides
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/12—Treatment with organosilicon compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

1527760 Stabilization of chromium dioxide BASF AG 17 Dec 1975 [18 Dec 1974 1 Sept 1975] 51568/75 Heading C1A Magnetic chromium dioxide particles are suspended in an aqueous and/or alcoholic medium containing the compound R n SI(OR<SP>1</SP>) 4-n or a hydrolysis product thereof (wherein R is organic of 1-18 C, R' is aliphatic either with 1-8 C in an uninterrupted chain or with 1-10 C in a chain interrupted by oxygen and n is 1, 2 or 3) and are subsequently isolated with a coating of an at least partial hydrolysis product of the silane and dried at 50-200‹ C. Silanes exemplified are isobutyl-, vinyl-, y-methacryloxypropyl, and y-glycidyloxypropyltrimethoxy- and n-propyltrimethoxy-silanes. An acid or base may be added to ensure hydrolysis. The dried product may be heated at 70-200‹ C. before processing into magnetic recording media.
GB5156875A 1974-12-18 1975-12-17 Stabilization of chromium dioxide magnetic pigments Expired GB1527760A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19742459766 DE2459766A1 (en) 1974-12-18 1974-12-18 Stabilised chromium dioxide magnetic pigments - obtd. by treatment with a hydrolysis prod. of an alkoxy silane and heat treating the prod.
DE19752538792 DE2538792A1 (en) 1975-09-01 1975-09-01 Stabilising magnetic chromium dioxide pigments - by suspending in aqueous medium, treating with hydrolysable organic silane, and drying

Publications (1)

Publication Number Publication Date
GB1527760A true GB1527760A (en) 1978-10-11

Family

ID=25768117

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5156875A Expired GB1527760A (en) 1974-12-18 1975-12-17 Stabilization of chromium dioxide magnetic pigments

Country Status (6)

Country Link
JP (1) JPS5186796A (en)
CA (1) CA1079057A (en)
FR (1) FR2295096A1 (en)
GB (1) GB1527760A (en)
IT (1) IT1060452B (en)
NL (1) NL7514524A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51134899A (en) * 1975-05-17 1976-11-22 Hitachi Maxell Ltd Processing method of magnetic powder
DE2617809C2 (en) * 1976-04-23 1984-09-20 Basf Ag, 6700 Ludwigshafen Process for the stabilization of chromium dioxide magnetic pigments and its use
JPS56130822A (en) * 1980-03-19 1981-10-14 Hitachi Maxell Ltd Magnetic recording medium
JPH0677310B2 (en) * 1986-08-29 1994-09-28 富士写真フイルム株式会社 Magnetic recording medium
JPH04184903A (en) * 1990-11-19 1992-07-01 Toda Kogyo Corp Manufacture of magnetic particle power for magnetic recording

Also Published As

Publication number Publication date
FR2295096A1 (en) 1976-07-16
IT1060452B (en) 1982-08-20
CA1079057A (en) 1980-06-10
JPS5186796A (en) 1976-07-29
NL7514524A (en) 1976-06-22

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Legal Events

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