GB1189041A - A Magnetic Coating Composition, method for preparing a Magnetic Disk and the Disk thus prepared - Google Patents
A Magnetic Coating Composition, method for preparing a Magnetic Disk and the Disk thus preparedInfo
- Publication number
- GB1189041A GB1189041A GB18168A GB18168A GB1189041A GB 1189041 A GB1189041 A GB 1189041A GB 18168 A GB18168 A GB 18168A GB 18168 A GB18168 A GB 18168A GB 1189041 A GB1189041 A GB 1189041A
- Authority
- GB
- United Kingdom
- Prior art keywords
- epoxy
- formula
- disk
- per molecule
- resin
- 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
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
Landscapes
- Paints Or Removers (AREA)
Abstract
1189041 Magnetic compositions MEMOREX CORP 1 Jan 1968 [ 27 Feb 1967] 181/68 Index C3B 1 L4H C8B L6G C12 C9B C25 C14A T1A L2X D2C D2B C8R. Index C3R 29 L4H C6X C8B L6G C12 C9B C25 C14A T1 L2X A coating composition comprises magnetic particles dispersed in a binder comprising a high equivalent weight epoxy resin (A), a low equivalent weight epoxy resin (B), an aminealdehyde condensation product (C), and a primary amine (D). (A) has an average of 1-3 epoxy groups per molecule and a M. wt. of 400-1200 per epoxy group, and may be a condensation polymer of epichlorohydrin and bisphenol A of formula: - where n is 2-6. (B) has an average of 3-4 epoxy groups per molecule and a M. wt. of 130-200 per epoxy group, and may be an epoxylated phenolic novolac of formula: - where n is 1-6. (C) has at least 2 secondary amine groups per molecule and may be an alkylated melamine formaldehyde resin of monomeric formula: - where R is alkyl C 1 -C 4 , or a butylated urea formaldehyde condensation product. (D) may be N-aminoethyl piperazine, N-(trimethoxysilylpropyl) ethylene diamine, diethylenetriamine, or ethylene-diamine. The compsotiion may also contain 3, 4-epoxycyclohexyl-ethyltrimethoxy silane, glycidoxy, prooyltrimethoxy silane, silicone resin, or methylphenylpolysiloxane. The ratio of epoxy groups in (A) : (B) is 1À5 : 1 to 1 : 3. The number of primary amine groups in (D) is 3-15% of the total number of epoxy groups, which is 1-1À5 times the number of H atoms in the primary and secondary amine groups in (C) and (D). The binder is dissolved in solvents and the composition coated on to a substrate, e.g. Al, or a plastics plate or "Mylan" tape, and cured, e.g. at 185‹C. Solvents mentioned are acetone, MEK, isopropanol, xylene, "Cellosolve, " hexanol, methylcarbitol, toluene, diethyl carbitol, and nitropropane.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US61901767A | 1967-02-27 | 1967-02-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1189041A true GB1189041A (en) | 1970-04-22 |
Family
ID=24480106
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB18168A Expired GB1189041A (en) | 1967-02-27 | 1968-01-01 | A Magnetic Coating Composition, method for preparing a Magnetic Disk and the Disk thus prepared |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE709471A (en) |
FR (1) | FR1552411A (en) |
GB (1) | GB1189041A (en) |
NL (1) | NL6800896A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4414271A (en) | 1981-02-27 | 1983-11-08 | Fuji Photo Film Co., Ltd. | Magnetic recording medium and method of preparation thereof |
-
1968
- 1968-01-01 GB GB18168A patent/GB1189041A/en not_active Expired
- 1968-01-17 FR FR1552411D patent/FR1552411A/fr not_active Expired
- 1968-01-17 BE BE709471D patent/BE709471A/xx unknown
- 1968-01-19 NL NL6800896A patent/NL6800896A/xx unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4414271A (en) | 1981-02-27 | 1983-11-08 | Fuji Photo Film Co., Ltd. | Magnetic recording medium and method of preparation thereof |
Also Published As
Publication number | Publication date |
---|---|
NL6800896A (en) | 1968-08-28 |
DE1574518A1 (en) | 1970-11-26 |
DE1574518B2 (en) | 1973-01-04 |
FR1552411A (en) | 1969-01-03 |
BE709471A (en) | 1968-07-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |