WO1983002519A1 - Magnetic recording medium - Google Patents
Magnetic recording medium Download PDFInfo
- Publication number
- WO1983002519A1 WO1983002519A1 PCT/JP1983/000006 JP8300006W WO8302519A1 WO 1983002519 A1 WO1983002519 A1 WO 1983002519A1 JP 8300006 W JP8300006 W JP 8300006W WO 8302519 A1 WO8302519 A1 WO 8302519A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- recording medium
- polymer
- magnetic
- magnetic recording
- radiation
- Prior art date
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
- G11B5/7021—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
-
- 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
- G11B5/7027—Graft polymers
Definitions
- TECHNICAL FIELD This invention relates to a magnetic recording medium.] More specifically, it relates to a particularly durable magnetic recording medium.
- a magnetic recording medium For example, body
- a method of using a solder to improve the adhesion to the magnetic powder, and as a result, improving the dispersibility and the filling property to reduce powder drop is used.
- a polymer obtained by polymerizing a magnetic powder and a copolymer component having good compatibility with the magnetic powder is used as a binder, whereby the binder and the magnetic powder of the binder can be combined. It has been proposed to improve the adhesion.
- such a method requires that all of the copolymerization components have a polymerization ability, and even if the conditions are satisfied, the relative polymerization reactivity ratio is appropriate.
- An object of the present invention is to obtain a highly durable magnetic recording medium by using a modified polymer in a binder.
- the modified polymer used in the present invention is obtained by irradiating a nitrogen-containing polymerizable unsaturated compound to a conventional polymer used as a binder of a magnetic recording medium by irradiation. It can be obtained by polymerizing and denaturing.
- Such modified polymers are irradiated with radiation such as gamma rays and electron beams, not only polymers undergoing graphitic polymerization, to produce organic free radicals. Thereafter, the polymer can be obtained by modifying the polymer by polymerizing a monomer of a nitrogen-containing polymerizable unsaturated compound onto the free radical. It can also be obtained by irradiating radiation to a mixture of a normal polymer used as a binder for a magnetic recording medium and a nitrogen-containing polymerizable unsaturated compound, for graphit polymerization. This is also possible.
- the polymer which is obtained by graphitizing and modifying a nitrogen-containing polymerizable unsaturated compound is a polymer which produces free radicals upon irradiation with radiation and is exposed to radiation. Anything that can be used if it breaks down. In the case of organic matter, the use of radiation with a high penetrating capacity will generate extraordinary free radicals, and the polymer will collapse depending on the radiation dose. However, if the irradiation is carried out under the condition that the irradiation dose is reduced and the landslide is suppressed,
- the applicability of this method is very broad, as it is possible to generate enough free radicals to react with the nitrogen-containing polymerizable monomers.
- the polymer to which the method can be applied is preferably a polymer having a molecular weight of about 10,000 to 100,000.
- vinyl chloride-vinyl acetate copolymers can be used.
- Examples of the radiation for irradiating the above-described polymer with the nitrogen-containing polymerizable unsaturated compound for graph-polymerization include, for example, gamma rays and electron beams.
- the dose is in the range of about 0.1 to 10 Mrad.
- Examples of the nitrogen-containing polymerizable unsaturated compound to be polymerized into a polymer as described above include 2-vinyl pyridine and 4-vinyl pyridine. Which nitrogen-containing heterocyclic vinyl compounds, dimethylaminopropyl acrylate, dimethylaminopropyl methacrylate, dimethyl Chiral amino acrylate, dimethyl amino acrylate Are methacrylate, dimethylamine acrylamide, dimethylamine methacrylate amide, dimethylamine Minor mouth Pirua cryamid, dimethylalumina, etc. Examples include minoacrylamide or methacrylamide.
- the ratio of the polymerizable unsaturated compound to the polymer to be modified is about 0.1 to 10 parts by weight based on 100 parts by weight of the polymer to be modified. Is preferred.
- the ratio of the polymerizable unsaturated compound is too small, the affinity of the introduced nitrogen-containing hydrophilic group with respect to the magnetic powder is insufficient, and the desired dispersing ability and filling property are generated.
- the denatured polymer OMPI The solubility in one solvent has worsen ??? or insolubilization deteriorates the compatibility with other binders.
- the viscosity of the magnetic coating material is extremely low.
- the method of reacting a polymerizable unsaturated compound with an ordinary polymer by irradiation with radiation to modify the polymer is the same as the power of the graphite polymerization method.
- This graph polymerization method can also be performed according to a conventional method.
- the modified polymer contained in the binder can exert a sufficient effect even when used in a mixture with the ordinary binder as described above.
- a binder composed of the modified polymer is used in combination with a normal binder, it is desirable that at least about 1 weight of the binder composed of the modified polymer be used. The effect can be expected.
- modified polymer used in the present invention may be a system combining a multifunctional isocyanate compound or an ordinary binder and a multifunctional isocyanate as described above.
- a thermosetting type system may be used in combination with a net compound.
- the magnetic powder rather good also Re I accepted if also the a usually used in a magnetic recording medium, for example, r - Fe z 0 5, Fe 5 0 4 vr - Fe 2 0 5 and Fe 3 0 4 iron oxide intermediate oxidation state, Co-containing r - ⁇ 2 0 ⁇ , Co-containing Fe 3 0 4, Co-containing r - Fe 2 0 5 and Fe 3 0 4 iron oxide intermediate oxidation state
- the iron oxide further contains one or more metal elements (particularly transition metal elements).
- Magnetic powder or metal such as Fe, Go, Ni or Fe-Go alloy: Fe-Ni alloy, Fe-Go-alloy, CoNi-P alloy, Go-Ni-Fe
- Ferromagnetic fine powders such as -B alloy, Fe-Ni-Zn alloy, Fe-Mn-Zn alloy, Pe-Co-Ni-P alloy.
- the modified polymer according to the present invention and the magnetic paint made of magnetic powder may be used as abrasives such as aluminum oxide, chromium oxide, and silicon oxide. , Carbon black as an antistatic agent, and molybdenum disulfide, graphite, silicone oil and olive oil as lubricants Etc. can be added.
- nonmagnetic support on which the magnetic layer is formed by the magnetic paint made of the composition as described above examples include, for example, polyethylene terephthalate and the like. Polyester, Polypropylene, etc. Poly Ref., Cellulosic Reset Acet. Non-magnetic materials such as cell derivatives, polycarbonate, polyvinyl chloride, polyimid, aluminum, copper, etc., and paper ⁇
- Solvents that can be used in preparing magnetic paints include acetate, methylethylketone, methylisobutylketone, and cyclohexene.
- OMPI IPO ⁇ Which alcohol, 'Methyl sulphate, Ethyl sulphate, Butyl acetate, Ethyl butyrate Which esther,' Ethylene glycol alcohol methyl ester Glu-Ethylene u-Cool Mono-Ethyl, Glycosan and other Glycol ethers; Benzen, Toluene, Kishi Aromatic hydrocarbons such as len; hexane, heptane; aliphatic hydrocarbons; and mixtures thereof.
- the magnetic recording medium according to the present invention has good magnetic powder adhesion to the non-magnetic support, and also has improved magnetic powder dispersibility, fillability, and surface properties. It has excellent durability and durability.
- polyurethane (trade name “N-234”; manufactured by Nippon Polyurethane Industry Co., Ltd.) 5 weight of 2-vinyl pyridine per 100 weight parts The mixture was mixed to form a sheet having a thickness of about 10, and then irradiated with 5 Mrad ⁇ electron beam to obtain modified polyurethane.
- Methyl ethyl ketone 500 ⁇ methyl isobutyl ketone 500 5 A magnetic paint is prepared by kneading a coating composition having the above-described composition to prepare a magnetic paint. was applied on a polyester base film having a thickness of 1 so as to have a thickness of 4 ⁇ m. After drying, it was cut into magnetic tapes.
- Example 2 Using a coating having the following composition, a polyester base film having a thickness of 1 1 ⁇ ⁇ was applied so as to have a thickness of 4 im. A magnetic tape was produced in the same manner as in 1.
- OMPI In place of denatured polyurethane], use magnetic tape in the same manner as in m2 except that non-denatured polyurethane (trade name “N-2504”) is used. Was made.
- the powder falling was evaluated by the amount of powder adhering to the magnetic head, tape guide, etc. after the tape was run. The style scans the same location on the magnetic tape with the magnetic head,
- the magnetic tape according to the present invention was excellent not only in electromagnetic conversion characteristics but also in surface properties and durability.
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08324033A GB2124242B (en) | 1982-01-14 | 1983-01-10 | Magnetic recording medium |
DE3328621T DE3328621C2 (de) | 1982-01-14 | 1983-01-10 | Magnetisches Aufzeichnungsmedium |
NLAANVRAGE8320003,A NL188873C (nl) | 1982-01-14 | 1983-01-10 | Registratiemedium voor magnetische registratie. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57004355A JPS58122619A (ja) | 1982-01-14 | 1982-01-14 | 磁気記録媒体 |
JP57/4355820114 | 1982-01-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1983002519A1 true WO1983002519A1 (en) | 1983-07-21 |
Family
ID=11582087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1983/000006 WO1983002519A1 (en) | 1982-01-14 | 1983-01-10 | Magnetic recording medium |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0098885B1 (ja) |
JP (1) | JPS58122619A (ja) |
DE (1) | DE3328621C2 (ja) |
GB (1) | GB2124242B (ja) |
NL (1) | NL188873C (ja) |
WO (1) | WO1983002519A1 (ja) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54153009A (en) * | 1978-05-23 | 1979-12-01 | Toyo Tire & Rubber Co | Magnetic recording medium |
JPS55100157A (en) * | 1979-01-19 | 1980-07-30 | Minnesota Mining & Mfg | Coating |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1196214A (en) * | 1967-08-17 | 1970-06-24 | Du Pont | Chromium Dioxide Recording Members Stabilized with Tertiary Amine-Containing Polymers |
AU511749B2 (en) * | 1977-01-07 | 1980-09-04 | Commonwealth Scientific And Industrial Research Organisation | Graft copolymers |
US4286022A (en) * | 1979-01-19 | 1981-08-25 | Minnesota Mining And Manufacturing Company | Coating of fine particles in polyurethane block copolymer binder |
JPS5864627A (ja) * | 1981-10-15 | 1983-04-18 | Sony Corp | 磁気記録媒体 |
-
1982
- 1982-01-14 JP JP57004355A patent/JPS58122619A/ja active Pending
-
1983
- 1983-01-10 DE DE3328621T patent/DE3328621C2/de not_active Expired - Lifetime
- 1983-01-10 EP EP83900279A patent/EP0098885B1/en not_active Expired
- 1983-01-10 GB GB08324033A patent/GB2124242B/en not_active Expired
- 1983-01-10 NL NLAANVRAGE8320003,A patent/NL188873C/xx not_active IP Right Cessation
- 1983-01-10 WO PCT/JP1983/000006 patent/WO1983002519A1/ja active IP Right Grant
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54153009A (en) * | 1978-05-23 | 1979-12-01 | Toyo Tire & Rubber Co | Magnetic recording medium |
JPS55100157A (en) * | 1979-01-19 | 1980-07-30 | Minnesota Mining & Mfg | Coating |
Non-Patent Citations (1)
Title |
---|
See also references of EP0098885A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP0098885A4 (fr) | 1986-05-14 |
NL188873C (nl) | 1992-10-16 |
DE3328621T1 (de) | 1984-01-12 |
GB2124242B (en) | 1985-08-07 |
GB8324033D0 (en) | 1983-10-12 |
EP0098885B1 (en) | 1989-04-19 |
GB2124242A (en) | 1984-02-15 |
NL8320003A (nl) | 1983-12-01 |
JPS58122619A (ja) | 1983-07-21 |
EP0098885A1 (en) | 1984-01-25 |
DE3328621C2 (de) | 1996-08-14 |
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