MAGNETIC DISK MEDIUM
PURPOSE:To obtain the medium having high S/N by mixing two kinds of Al2O3 having a different grain size into a coating film in a specified ratio and allowing the grains having a different diameter to play a different role in reinforcing the coating film. CONSTITUTION:The magnetic grains of gamma-Fe2...
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| creator | HASHIMOTO TOSHIRO |
| description | PURPOSE:To obtain the medium having high S/N by mixing two kinds of Al2O3 having a different grain size into a coating film in a specified ratio and allowing the grains having a different diameter to play a different role in reinforcing the coating film. CONSTITUTION:The magnetic grains of gamma-Fe2O3 or Co-coated gamma-Fe2O3 and the Al2O3 grains for reinforcing the coating film obtained by mixing the grains having 0.05-0.2mum average diameter and the grains having 0.4-1mum average diameter in the volume ratio of (9:1)-(5:5) in the amt. to control the volume content when the coating film is formed after coating and baking to 0.5-5% based on the coating film volume are mixed, kneaded and dispersed in the resin and solvent to obtain a magnetic coating to be applied on a magnetic disk substrate. The coating is applied on a nonmagnetic substrate in desired thickness by spin coating and baked, and then the surface is lapped. Since the two kinds of Al2O3 having a different grain diameter are incorporated to reinforce the coating film and allowed to play a different role in reinforcing the coating film, the durability of the coating film is improved, and a medium excellent in S/N is obtained. |
| format | Patent |
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CONSTITUTION:The magnetic grains of gamma-Fe2O3 or Co-coated gamma-Fe2O3 and the Al2O3 grains for reinforcing the coating film obtained by mixing the grains having 0.05-0.2mum average diameter and the grains having 0.4-1mum average diameter in the volume ratio of (9:1)-(5:5) in the amt. to control the volume content when the coating film is formed after coating and baking to 0.5-5% based on the coating film volume are mixed, kneaded and dispersed in the resin and solvent to obtain a magnetic coating to be applied on a magnetic disk substrate. The coating is applied on a nonmagnetic substrate in desired thickness by spin coating and baked, and then the surface is lapped. Since the two kinds of Al2O3 having a different grain diameter are incorporated to reinforce the coating film and allowed to play a different role in reinforcing the coating film, the durability of the coating film is improved, and a medium excellent in S/N is obtained.</description><language>eng</language><subject>ADHESIVES ; CHEMICAL PAINT OR INK REMOVERS ; CHEMISTRY ; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS ; CORRECTING FLUIDS ; DYES ; FILLING PASTES ; INFORMATION STORAGE ; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER ; INKS ; METALLURGY ; MISCELLANEOUS APPLICATIONS OF MATERIALS ; MISCELLANEOUS COMPOSITIONS ; NATURAL RESINS ; PAINTS ; PASTES OR SOLIDS FOR COLOURING OR PRINTING ; PHYSICS ; POLISHES ; USE OF MATERIALS THEREFOR ; WOODSTAINS</subject><creationdate>1990</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=19901213&DB=EPODOC&CC=JP&NR=H02301016A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76290</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19901213&DB=EPODOC&CC=JP&NR=H02301016A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>HASHIMOTO TOSHIRO</creatorcontrib><title>MAGNETIC DISK MEDIUM</title><description>PURPOSE:To obtain the medium having high S/N by mixing two kinds of Al2O3 having a different grain size into a coating film in a specified ratio and allowing the grains having a different diameter to play a different role in reinforcing the coating film. CONSTITUTION:The magnetic grains of gamma-Fe2O3 or Co-coated gamma-Fe2O3 and the Al2O3 grains for reinforcing the coating film obtained by mixing the grains having 0.05-0.2mum average diameter and the grains having 0.4-1mum average diameter in the volume ratio of (9:1)-(5:5) in the amt. to control the volume content when the coating film is formed after coating and baking to 0.5-5% based on the coating film volume are mixed, kneaded and dispersed in the resin and solvent to obtain a magnetic coating to be applied on a magnetic disk substrate. The coating is applied on a nonmagnetic substrate in desired thickness by spin coating and baked, and then the surface is lapped. 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CONSTITUTION:The magnetic grains of gamma-Fe2O3 or Co-coated gamma-Fe2O3 and the Al2O3 grains for reinforcing the coating film obtained by mixing the grains having 0.05-0.2mum average diameter and the grains having 0.4-1mum average diameter in the volume ratio of (9:1)-(5:5) in the amt. to control the volume content when the coating film is formed after coating and baking to 0.5-5% based on the coating film volume are mixed, kneaded and dispersed in the resin and solvent to obtain a magnetic coating to be applied on a magnetic disk substrate. The coating is applied on a nonmagnetic substrate in desired thickness by spin coating and baked, and then the surface is lapped. Since the two kinds of Al2O3 having a different grain diameter are incorporated to reinforce the coating film and allowed to play a different role in reinforcing the coating film, the durability of the coating film is improved, and a medium excellent in S/N is obtained.</abstract><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| subjects | ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS DYES FILLING PASTES INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INKS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PHYSICS POLISHES USE OF MATERIALS THEREFOR WOODSTAINS |
| title | MAGNETIC DISK MEDIUM |
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