MAGNETIC RECORDING MEDIUM
PURPOSE:To improve the dispersibility of ferromagnetic powder in magnetic coating material applied to a substrate and obtain a high S/N by a method wherein the ferromagnetic powder having a high coercive force and a fine needle-shape and fine magnetite powder having a low coercive force are mixed wi...
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| creator | ENDO KATSUMI ISHIKAWA AKIRA TAKO SHUNJI |
| description | PURPOSE:To improve the dispersibility of ferromagnetic powder in magnetic coating material applied to a substrate and obtain a high S/N by a method wherein the ferromagnetic powder having a high coercive force and a fine needle-shape and fine magnetite powder having a low coercive force are mixed with a specific weight ratio. CONSTITUTION:One of the components of magnetic coating material which is applied to a substrate to form a magnetic layer is fine needle-shaped ferromagnetic powder having a high coercive force. Metal powder, cobalt-coated iron oxide powder, etc., whose long axis length is not larger than 0.2mum and whose coercive force is not less than 1500Oe is used as the ferromagnetic powder. The other component is magnetite powder. Magnetite powder whose average particle diameter is not larger than 0.3mum and whose coercive force is not higher than 150Oe is used as the magnetite powder. The ferromagnetic powder (A) and the magnetite powder (B) are mixed and applied to the substrate with binder so as to have the weight ratio (B)/(A) of a formed magnetic layer 0.03-0.3. With this constitution, the magnetic powder is uniformly dispersed in the magnetic layer and the surface smoothness of the magnetic layer is improved, so that a high S/N can be obtained. |
| format | Patent |
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CONSTITUTION:One of the components of magnetic coating material which is applied to a substrate to form a magnetic layer is fine needle-shaped ferromagnetic powder having a high coercive force. Metal powder, cobalt-coated iron oxide powder, etc., whose long axis length is not larger than 0.2mum and whose coercive force is not less than 1500Oe is used as the ferromagnetic powder. The other component is magnetite powder. Magnetite powder whose average particle diameter is not larger than 0.3mum and whose coercive force is not higher than 150Oe is used as the magnetite powder. The ferromagnetic powder (A) and the magnetite powder (B) are mixed and applied to the substrate with binder so as to have the weight ratio (B)/(A) of a formed magnetic layer 0.03-0.3. With this constitution, the magnetic powder is uniformly dispersed in the magnetic layer and the surface smoothness of the magnetic layer is improved, so that a high S/N can be obtained.</description><edition>6</edition><language>eng</language><subject>ADHESIVES ; BASIC ELECTRIC ELEMENTS ; CHEMICAL PAINT OR INK REMOVERS ; CHEMISTRY ; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS ; CORRECTING FLUIDS ; DYES ; ELECTRICITY ; FILLING PASTES ; INDUCTANCES ; INFORMATION STORAGE ; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER ; INKS ; MAGNETS ; METALLURGY ; MISCELLANEOUS APPLICATIONS OF MATERIALS ; MISCELLANEOUS COMPOSITIONS ; NATURAL RESINS ; PAINTS ; PASTES OR SOLIDS FOR COLOURING OR PRINTING ; PHYSICS ; POLISHES ; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ; TRANSFORMERS ; USE OF MATERIALS THEREFOR ; WOODSTAINS</subject><creationdate>1995</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19950131&DB=EPODOC&CC=JP&NR=H0729151A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76290</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19950131&DB=EPODOC&CC=JP&NR=H0729151A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>ENDO KATSUMI</creatorcontrib><creatorcontrib>ISHIKAWA AKIRA</creatorcontrib><creatorcontrib>TAKO SHUNJI</creatorcontrib><title>MAGNETIC RECORDING MEDIUM</title><description>PURPOSE:To improve the dispersibility of ferromagnetic powder in magnetic coating material applied to a substrate and obtain a high S/N by a method wherein the ferromagnetic powder having a high coercive force and a fine needle-shape and fine magnetite powder having a low coercive force are mixed with a specific weight ratio. CONSTITUTION:One of the components of magnetic coating material which is applied to a substrate to form a magnetic layer is fine needle-shaped ferromagnetic powder having a high coercive force. Metal powder, cobalt-coated iron oxide powder, etc., whose long axis length is not larger than 0.2mum and whose coercive force is not less than 1500Oe is used as the ferromagnetic powder. The other component is magnetite powder. Magnetite powder whose average particle diameter is not larger than 0.3mum and whose coercive force is not higher than 150Oe is used as the magnetite powder. The ferromagnetic powder (A) and the magnetite powder (B) are mixed and applied to the substrate with binder so as to have the weight ratio (B)/(A) of a formed magnetic layer 0.03-0.3. With this constitution, the magnetic powder is uniformly dispersed in the magnetic layer and the surface smoothness of the magnetic layer is improved, so that a high S/N can be obtained.</description><subject>ADHESIVES</subject><subject>BASIC ELECTRIC ELEMENTS</subject><subject>CHEMICAL PAINT OR INK REMOVERS</subject><subject>CHEMISTRY</subject><subject>COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS</subject><subject>CORRECTING FLUIDS</subject><subject>DYES</subject><subject>ELECTRICITY</subject><subject>FILLING PASTES</subject><subject>INDUCTANCES</subject><subject>INFORMATION STORAGE</subject><subject>INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER</subject><subject>INKS</subject><subject>MAGNETS</subject><subject>METALLURGY</subject><subject>MISCELLANEOUS APPLICATIONS OF MATERIALS</subject><subject>MISCELLANEOUS COMPOSITIONS</subject><subject>NATURAL RESINS</subject><subject>PAINTS</subject><subject>PASTES OR SOLIDS FOR COLOURING OR PRINTING</subject><subject>PHYSICS</subject><subject>POLISHES</subject><subject>SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES</subject><subject>TRANSFORMERS</subject><subject>USE OF MATERIALS THEREFOR</subject><subject>WOODSTAINS</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1995</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZJD0dXT3cw3xdFYIcnX2D3Lx9HNX8HV18Qz15WFgTUvMKU7lhdLcDApuriHOHrqpBfnxqcUFicmpeakl8V4BHgbmRpaGpoaOxkQoAQDVNh-4</recordid><startdate>19950131</startdate><enddate>19950131</enddate><creator>ENDO KATSUMI</creator><creator>ISHIKAWA AKIRA</creator><creator>TAKO SHUNJI</creator><scope>EVB</scope></search><sort><creationdate>19950131</creationdate><title>MAGNETIC RECORDING MEDIUM</title><author>ENDO KATSUMI ; ISHIKAWA AKIRA ; TAKO SHUNJI</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_JPH0729151A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1995</creationdate><topic>ADHESIVES</topic><topic>BASIC ELECTRIC ELEMENTS</topic><topic>CHEMICAL PAINT OR INK REMOVERS</topic><topic>CHEMISTRY</topic><topic>COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS</topic><topic>CORRECTING FLUIDS</topic><topic>DYES</topic><topic>ELECTRICITY</topic><topic>FILLING PASTES</topic><topic>INDUCTANCES</topic><topic>INFORMATION STORAGE</topic><topic>INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER</topic><topic>INKS</topic><topic>MAGNETS</topic><topic>METALLURGY</topic><topic>MISCELLANEOUS APPLICATIONS OF MATERIALS</topic><topic>MISCELLANEOUS COMPOSITIONS</topic><topic>NATURAL RESINS</topic><topic>PAINTS</topic><topic>PASTES OR SOLIDS FOR COLOURING OR PRINTING</topic><topic>PHYSICS</topic><topic>POLISHES</topic><topic>SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES</topic><topic>TRANSFORMERS</topic><topic>USE OF MATERIALS THEREFOR</topic><topic>WOODSTAINS</topic><toplevel>online_resources</toplevel><creatorcontrib>ENDO KATSUMI</creatorcontrib><creatorcontrib>ISHIKAWA AKIRA</creatorcontrib><creatorcontrib>TAKO SHUNJI</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>ENDO KATSUMI</au><au>ISHIKAWA AKIRA</au><au>TAKO SHUNJI</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>MAGNETIC RECORDING MEDIUM</title><date>1995-01-31</date><risdate>1995</risdate><abstract>PURPOSE:To improve the dispersibility of ferromagnetic powder in magnetic coating material applied to a substrate and obtain a high S/N by a method wherein the ferromagnetic powder having a high coercive force and a fine needle-shape and fine magnetite powder having a low coercive force are mixed with a specific weight ratio. CONSTITUTION:One of the components of magnetic coating material which is applied to a substrate to form a magnetic layer is fine needle-shaped ferromagnetic powder having a high coercive force. Metal powder, cobalt-coated iron oxide powder, etc., whose long axis length is not larger than 0.2mum and whose coercive force is not less than 1500Oe is used as the ferromagnetic powder. The other component is magnetite powder. Magnetite powder whose average particle diameter is not larger than 0.3mum and whose coercive force is not higher than 150Oe is used as the magnetite powder. The ferromagnetic powder (A) and the magnetite powder (B) are mixed and applied to the substrate with binder so as to have the weight ratio (B)/(A) of a formed magnetic layer 0.03-0.3. With this constitution, the magnetic powder is uniformly dispersed in the magnetic layer and the surface smoothness of the magnetic layer is improved, so that a high S/N can be obtained.</abstract><edition>6</edition><oa>free_for_read</oa></addata></record> |
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| language | eng |
| recordid | cdi_epo_espacenet_JPH0729151A |
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| subjects | ADHESIVES BASIC ELECTRIC ELEMENTS CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS DYES ELECTRICITY FILLING PASTES INDUCTANCES INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INKS MAGNETS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PHYSICS POLISHES SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS USE OF MATERIALS THEREFOR WOODSTAINS |
| title | MAGNETIC RECORDING MEDIUM |
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