JPS551633A - Production of magnetic recording medium - Google Patents
Production of magnetic recording mediumInfo
- Publication number
- JPS551633A JPS551633A JP7436078A JP7436078A JPS551633A JP S551633 A JPS551633 A JP S551633A JP 7436078 A JP7436078 A JP 7436078A JP 7436078 A JP7436078 A JP 7436078A JP S551633 A JPS551633 A JP S551633A
- Authority
- JP
- Japan
- Prior art keywords
- water
- magnetic
- pressure
- magnetic paint
- foam removal
- 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.)
- Pending
Links
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
PURPOSE: To prevent the generation of a pin-hole in a formed magnetic layer by completing approximately foam erasing and gas removal of a magnetic paint by performing a specific vacuum foam removal processing in the adjustment of the water-emulsion system magnetic paint.
CONSTITUTION: First, magnetic powder is scattered sufficiently in water under the existence of a dispersant. Next, the pressure in the system is reduced up to 550mm Hg or less under the agitation of dispersive liquid, and the pressure reduction processing is continued until break of foams disappears. Next, pressure reduction is performed again after the pressure in the system is returned to a normal pressure by blowing organic solvent vapour into the system. After this first-stage vacuum foam removal processing is repeated, water-polymer emulsion is added and scattered to dispersive liquid. The obtained water-emulsion system magnetic paint is subjected to the second-stage vacuum foam removal processing similar to the first-stage processing at a temperature below 40°C desirably. The magnetic paint after foam removal processings is applied onto a substrate and is dried, so that a magnetic recording medium where defects such as drop-out and output fluctuation are cancelled can be obtained.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7436078A JPS551633A (en) | 1978-06-20 | 1978-06-20 | Production of magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7436078A JPS551633A (en) | 1978-06-20 | 1978-06-20 | Production of magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS551633A true JPS551633A (en) | 1980-01-08 |
Family
ID=13544880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7436078A Pending JPS551633A (en) | 1978-06-20 | 1978-06-20 | Production of magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS551633A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5815573A (en) * | 1981-07-22 | 1983-01-28 | Toyo Ink Mfg Co Ltd | Radiation-curable magnetic paint and magnetic recording medium obtained using the paint |
| JPS5880365A (en) * | 1981-11-09 | 1983-05-14 | Tokyo Jiki Insatsu Kk | Aqueous magnetic paint composition |
| JPWO2015125605A1 (en) * | 2014-02-18 | 2017-03-30 | 昭和電工株式会社 | Aqueous resin composition for thick film construction, manufacturing method thereof, surface treatment method, and concrete structure |
| JP2019189766A (en) * | 2018-04-26 | 2019-10-31 | 東レ株式会社 | Method for producing coating liquid |
-
1978
- 1978-06-20 JP JP7436078A patent/JPS551633A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5815573A (en) * | 1981-07-22 | 1983-01-28 | Toyo Ink Mfg Co Ltd | Radiation-curable magnetic paint and magnetic recording medium obtained using the paint |
| WO1983000340A1 (en) * | 1981-07-22 | 1983-02-03 | Ohtsuki, Akira | Radiation-curable magnetic paint and magnetic recording medium obtained by using the same |
| JPS5880365A (en) * | 1981-11-09 | 1983-05-14 | Tokyo Jiki Insatsu Kk | Aqueous magnetic paint composition |
| JPWO2015125605A1 (en) * | 2014-02-18 | 2017-03-30 | 昭和電工株式会社 | Aqueous resin composition for thick film construction, manufacturing method thereof, surface treatment method, and concrete structure |
| JP2019189766A (en) * | 2018-04-26 | 2019-10-31 | 東レ株式会社 | Method for producing coating liquid |
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