GB1466798A – Process for the manufacture of magnetic recording discs
– Google Patents
GB1466798A – Process for the manufacture of magnetic recording discs
– Google Patents
Process for the manufacture of magnetic recording discs
Info
Publication number
GB1466798A
GB1466798A
GB1642274A
GB1642274A
GB1466798A
GB 1466798 A
GB1466798 A
GB 1466798A
GB 1642274 A
GB1642274 A
GB 1642274A
GB 1642274 A
GB1642274 A
GB 1642274A
GB 1466798 A
GB1466798 A
GB 1466798A
Authority
GB
United Kingdom
Prior art keywords
magnetic
coating
resin
binder
disc
Prior art date
1973-04-17
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
GB1642274A
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.)
1973-04-17
Filing date
1974-04-16
Publication date
1977-03-09
1973-04-17
Priority claimed from DE19732319363
external-priority
patent/DE2319363C3/en
1974-04-16
Application filed by BASF SE
filed
Critical
BASF SE
1977-03-09
Publication of GB1466798A
publication
Critical
patent/GB1466798A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
Abstract
1466798 Magnetic coatings BASF AG 16 April 1974 [17 April 1973] 16422/74 Heading B2E [Also in Division C3] A non-magnetic disc, e g. of optionally anodized Al or Al alloy, is coated on one or both sides with a polished, hard pigmentcontaining resin, and then with a magnetic coating composition which comprises a finelydivided magnetic pigment in a binder comprising volatile organic solvent(s) and a mixture of, by weight, 60-70% (A) an epoxy resin, 10-30% (B) a resole, and 10-30% (C) an etherified melamineformaldehyde resin, where (A) is a solid curable bisphenol-A/epichlorohydrin resin of epoxy E.W. 400-2500, with m.p. 50-150‹C, (B) is a curable allyloxybenzene/formaldehyde condensate with free or etherified methylol groups, with M.W. <1000, and (C) has >2 methylol groups etherified with n-butanol or isobutanol, with M.W. <2500. Also present may be 5-20%, based on (A + B + C), of polyvinyl methyl ether. Per part by weight of the binder there may be 0.5-3 parts magnetic pigment, e.g. Fe 3 O 4 or rod-shaped or acicular γ-Fe 2 O 3 , with av. particle size 0.1-2 Ám. Also present may be polysiloxane and non-magnetic powder of Moh hardness >6, with particle size 0.5-1.5Î the final magnetic coating thickness, e.g. corundum, non-magnetic Fe oxide, or B carbide. By wt based on (binder + magnetic pigment) there may be 100-150% solvent(s). Many solvents are specified. After coating, the magnetic coating is dried, cured at e.g. 150-300‹C, and ground or polished. The coating may be 1.5-4 Ám thick. The sub-coating composition may comprise Fe 2 O 3 , polysiloxane, epoxy resin electrocorundum, and solvents. The coating compositions may be applied by spraying on one or both sides of the slowly rotating/disc, which may be inclined, followed by rotating the disc at a higher speed to adjust the coating thickness.
GB1642274A
1973-04-17
1974-04-16
Process for the manufacture of magnetic recording discs
Expired
GB1466798A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
DE19732319363
DE2319363C3
(en)
1973-04-17
Process for the production of magnetic recording disks
Publications (1)
Publication Number
Publication Date
GB1466798A
true
GB1466798A
(en)
1977-03-09
Family
ID=5878370
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1642274A
Expired
GB1466798A
(en)
1973-04-17
1974-04-16
Process for the manufacture of magnetic recording discs
Country Status (6)
Country
Link
JP
(1)
JPS5716413B2
(en)
BE
(1)
BE813834A
(en)
FR
(1)
FR2226719B3
(en)
GB
(1)
GB1466798A
(en)
IT
(1)
IT1005968B
(en)
NL
(1)
NL179616C
(en)
Families Citing this family (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
JPS5693122A
(en)
*
1979-12-24
1981-07-28
Fujitsu Ltd
Magnetic recording medium having lubricated magnetic recording layer
JPS62182309U
(en)
*
1986-05-09
1987-11-19
1974
1974-04-09
NL
NL7404833A
patent/NL179616C/en
not_active
IP Right Cessation
1974-04-10
JP
JP4012774A
patent/JPS5716413B2/ja
not_active
Expired
1974-04-16
GB
GB1642274A
patent/GB1466798A/en
not_active
Expired
1974-04-16
IT
IT5041074A
patent/IT1005968B/en
active
1974-04-17
FR
FR7413308A
patent/FR2226719B3/fr
not_active
Expired
1974-04-17
BE
BE143302A
patent/BE813834A/en
not_active
IP Right Cessation
Also Published As
Publication number
Publication date
IT1005968B
(en)
1976-09-30
NL179616B
(en)
1986-05-01
DE2319363B2
(en)
1977-06-30
JPS5716413B2
(en)
1982-04-05
FR2226719B3
(en)
1977-02-18
NL7404833A
(en)
1974-10-21
JPS503309A
(en)
1975-01-14
NL179616C
(en)
1986-10-01
BE813834A
(en)
1974-10-17
FR2226719A1
(en)
1974-11-15
DE2319363A1
(en)
1974-11-07
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Legal Events
Date
Code
Title
Description
1977-07-20
PS
Patent sealed
1990-12-12
PCNP
Patent ceased through non-payment of renewal fee
