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公开(公告)号：JPH1055526A
公开(公告)日：1998-02-24
申请号：JP20972096
申请日：1996-08-08
Applicant: KAO CORP
Inventor： YAMASHITA KAZUTAKA , NAKAYAMA HIDEHIKO , ISHIKAWA AKIRA
IPC: C08G18/10 , C09D5/23 , C09D175/00 , C09D175/04 , G11B5/702 , G11B5/735
Abstract: PROBLEM TO BE SOLVED: To improve the characteristics of a magnetic coating material as a coating material, to reduce error rate and to improve durability as well as to produce high output by using specified compds. as a binder and a curing agent in a magnetic layer. SOLUTION: This magnetic recording medium 1 has a nonmagnetic substrate 2, a middle layer 3 positioned on the substrate 2 and a magnetic layer 4 as the top layer positioned on the middle layer 3. The magnetic layer contains a binder having at least two hydroxyl groups in one molecule and a number average mol.wt. of 5,000-50,000 and a compd. having two or more isocyanato groups in one molecule, ether bond in one molecule and a number average mol.wt. of 500-5,000.
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公开(公告)号：JPH09219015A
公开(公告)日：1997-08-19
申请号：JP2693996
申请日：1996-02-14
Applicant: KAO CORP
Inventor： YAMASHITA KAZUTAKA , NAKAYAMA HIDEHIKO , ISHIKAWA AKIRA
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium which is improved in the surface characteristic of the magnetic recording medium, has excellent electrical characteristics and excellent traveling durability and is adequate as a medium for digital recording. SOLUTION: This magnetic recording medium includes a nonmagnetic base 2, an intermediate layer 3 existing on this nonmagnetic base 2, a magnetic layer 4 as the uppermost layer 3 existing on this intermediate layer 3 and a back coating layer 5 existing on the rear surface of the nonmagnetic base 2 and contg. carbon black. The magnetic layer 4 is formed of a magnetic coating material which contains Fe-Al acicular magnetic metallic powder having a specific surface area of >=45m /g, carbon black, alumina, fatty acid and fatty acid ester, etc., and contains a binder consisting of a polyvinyl chloride resin, block polyurethane of a number average molecular weight of
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公开(公告)号：JPH08263825A
公开(公告)日：1996-10-11
申请号：JP23584995
申请日：1995-09-13
Applicant: KAO CORP
Inventor： YAMASHITA KAZUTAKA , NAKAYAMA HIDEHIKO , ISHIKAWA AKIRA
IPC: C08L75/04 , C08G18/80 , C08L75/00 , C09D5/23 , C09D175/00 , C09D175/04 , G11B5/702
Abstract: PURPOSE: To obtain a magnetic recording medium capable of high density recording and excellent especially in output characteristics and durability. CONSTITUTION: This magnetic recording medium has a substrate and a magnetic layer disposed on the substrate. The magnetic layer is formed with a magnetic coating material contg. a compd. having one or more amino groups in one molecule and polyurethane resin obtd. by blocking the terminal isocyanato groups of an isocyanate prepolymer with an oxime compd.
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公开(公告)号：JPH08203062A
公开(公告)日：1996-08-09
申请号：JP1020095
申请日：1995-01-25
Applicant: KAO CORP
Inventor： YAMASHITA KAZUTAKA , NAKAYAMA HIDEHIKO , ISHIKAWA AKIRA
Abstract: PURPOSE: To improve adhesion of a supporting body to a magnetic layer by using a composition consisting essentially of a polyester or a polyether containing an oxime based block isocyanate group as the ground paint. CONSTITUTION: This composition for a ground layer of the magnetic recording medium is composed primarily of a polyester or polyether containing 21 pieces of oxime based block isocyanate groups per molecule. In this composition for the ground layer of the magnetic recording medium, the isocyanate group (reproduced isocyanate group) blocked with a oxime based compd. is introduced in the polyester or the polyether. In this case, a reaction of the polyester or the polyether having the isocyanate group with the oxime based compd. may be executed in a solvent having no active hydrogen or without using solvent.
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公开(公告)号：JPH08180382A
公开(公告)日：1996-07-12
申请号：JP32886494
申请日：1994-12-28
Applicant: KAO CORP
Inventor： ISHIKAWA AKIRA , NAKAYAMA HIDEHIKO , YAMASHITA KAZUTAKA
Abstract: PURPOSE: To obtain a magnetic recording medium having satisfactory surface smoothness, excellent in output (C/N) characteristics and overwriting characteristics and not causing the deterioration of durability due to the electrification of the medium. CONSTITUTION: In the magnetic recording medium 1 with a nonmagnetic substrate 2 and plural magnetic layers 3 disposed on the substrate 2 and including a 1st magnetic layer 3a as the top layer and a 2nd magnetic layer 3b adjacent to the 1st magnetic layer 3a, soft magnetic powder and electrically conductive powder of 0.005-0.2μm average particle size are incorporated into the 2nd magnetic layer 3b. The electrically conductive powder is powder of one or more selected from among TiO2 combined with antimony oxide, SnO2 combined with antimony oxide, In2 O3 combined with tin oxide In2 O3 combined with antimony oxide, BaSO4 combined with tin oxide and ZnO.
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Patent Agency Ranking
公开(公告)号：JPH08147674A
公开(公告)日：1996-06-07
申请号：JP28808794
申请日：1994-11-22
Applicant: KAO CORP
Inventor： ISHIKAWA AKIRA , NAKAYAMA HIDEHIKO , YAMASHITA KAZUTAKA
Abstract: PURPOSE: To obtain a magnetic recording medium of superior durability by setting a magnetic layer on one face and a back coat layer on the other face, and forming the magnetic layer of a magnetic paint containing a tertiary amine compound expressed by formula I with a hydroxyl group. CONSTITUTION: A magnetic layer formed on one face of a non-magnetic supporting body is obtained by applying a magnetic paint. The magnetic paint contains a tertiary amine compound with a hydroxyl group (referred to as a tertiary amine compound A hereinafter) and is expressed by formula I. The tertiary amine compound A has a tertiary amine group in the molecular structure thereof, and therefore exerts catalytic characteristics to a reaction between a hardener and a binder. Moreover, the tertiary amine compound A has a hydroxyl group at the terminal thereof, so that the compound itself reacts to the hardener and functions to accelerate to turn the binder into a polymer. It is most suitable to set the usage of the tertiary amine compound A in a range of 200ppm-8wt.% to the binder. The thickness of the magnetic layer of the magnetic recording medium after dried is preferably in a range of 0.05-5μm.
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公开(公告)号：JPH0845057A
公开(公告)日：1996-02-16
申请号：JP18028394
申请日：1994-08-01
Applicant: KAO CORP
Inventor： ISHIKAWA AKIRA , NAKAYAMA HIDEHIKO , YAMASHITA KAZUTAKA
Abstract: PURPOSE:To obtain a magnetic recording medium capable of high density recording and excellent especially in output characteristics and durability. CONSTITUTION:A nonmagnetic layer 2 and a magnetic layer 3 are formed on a magnetic substrate 1 by simultaneous double coating. The thickness of the nonmagnetic layer 2 is 0.5-3.0mum and that of the magnetic layer 3 is 0.1-1.0mum. The nonmagnetic layer 2 contains 0-2.0 pts.wt. fatty acid basing on 100 pts.wt. nonmagnetic powder, 5-25 pts.wt. fatty acid ester basing on 100 pts.wt. binder and 1.0-5.0 pts.wt., in total, of the fatty acid and fatty acid ester basing on 100 pts.wt. of the nonmagnetic powder. The magnetic layer 3 contains 0.5-3.0 pts.wt. fatty acid basing on 100 pts.wt. magnetic powder, 3.0-15 pts.wt. fatty acid ester basing on 100 pts.wt. binder and 2.0-5.0 pts.wt., in total, of the fatty acid and fatty acid ester basing on 100 pts.wt. of the magnetic powder.
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公开(公告)号：JPH0830960A
公开(公告)日：1996-02-02
申请号：JP16701394
申请日：1994-07-19
Applicant: KAO CORP
Inventor： ISHIKAWA AKIRA , NAKAYAMA HIDEHIKO , YAMASHITA KAZUTAKA
Abstract: PURPOSE:To obtain a magnetic recording medium capable of high density recording and excellent especially in output characteristics. CONSTITUTION:This magnetic recording medium consists essentially of a nonmagnetic substrate 1, a nonmagnetic layer 2 formed on the substrate 1 and a magnetic layer 3 formed on the nonmagnetic layer 2. The total surface area alpha1 of all powder contained per unit volume of the magnetic layer 3 (the total surface area of all powder/the total volume of the magnetic layer 3) [m /cm ] is; 130 /cm ] is 100
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公开(公告)号：JPH0817042A
公开(公告)日：1996-01-19
申请号：JP14835394
申请日：1994-06-29
Applicant: KAO CORP
Inventor： ISHIKAWA AKIRA , NAKAYAMA HIDEHIKO , YAMASHITA KAZUTAKA
Abstract: PURPOSE:To obtain a magnetic recording medium capable of high density recording and excellent especially in output characteristics. CONSTITUTION:This magnetic recording medium consists essentially of a magnetic substrate 1, a nonmagnetic layer 2 formed on the substrate 1 and a magnetic layer 3 formed on the nonmagnetic layer 2. Each of the nonmagnetic layer 2 and the magnetic layer 3 contains powder. The total surface area (alpha1 of all the powder contained per unit volume of the magnetic layer 3 (the total surface area of all the powder/the total volume of the magnetic layer 3) [m /cm ] is >130 to /cm ] is >100 to 0.8 to
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公开(公告)号：JPH0817039A
公开(公告)日：1996-01-19
申请号：JP14835094
申请日：1994-06-29
Applicant: KAO CORP
Inventor： ISHIKAWA AKIRA , NAKAYAMA HIDEHIKO , YAMASHITA KAZUTAKA
Abstract: PURPOSE:To obtain a magnetic recording medium capable of high density recording and excellent especially in output characteristics. CONSTITUTION:This magnetic recording medium consists essentially of a magnetic substrate 1, a nonmagnetic layer 2 formed on the substrate 1 and a magnetic layer 3 formed on the nonmagnetic layer 2. The nonmagnetic layer 2 has
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