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公开(公告)号：JPH0935242A
公开(公告)日：1997-02-07
申请号：JP356895
申请日：1995-01-12
Applicant: BASF MAGNETICS GMBH
Inventor： GUREEGORU BUROTO , AUGUSUTO REENAA , ARUFUREETO RINDONAA , HERUMAN GURAAFU , MIHIYAERU BOBURITSUHI , RIA KURESU , NORUBERUTO SHIYUNAIDAA , ARUBERUTO KOORU , BUERUNAA ROTSUHO
IPC: C08G18/65 , B01F17/00 , B01F17/52 , C08F2/38 , C08F8/30 , C08F8/32 , C08G18/10 , C08G18/62 , C08G18/78 , C09D5/23 , C09D7/45 , C09D17/00 , C09D175/04 , G11B5/70 , G11B5/702
Abstract: PURPOSE: To produce an inorg. pigment such as a magnetic pigment by stable preparation by obtaining a polymer compsn. fit for use as a dispersible resin. CONSTITUTION: A specified reactive compd. is allowed to react with a compd. having active amino functional property to an isocyanate or ammonia to obtain the objective polymer compsn. The reactive compd. is formed by allowing a polymer to react with one kind of polyisocyanate and the amt. of isocyanato groups is regulated to 1.2-3.6mol per 1mol hydroxyl group of the polymer agent. The polymer consists of 80-100mol% 1-25C alkyl ester of α,β-unsatd. carboxylic acid, 0-20mol% other monomer and tetrahydrofuran hydroperoxide as a polymn. initiator or further contains one kind of other polymn. initiator and/or a modifier imparting hydroxyl groups to the terminals of plural polymer chains of the polymer.
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公开(公告)号：JPH0863736A
公开(公告)日：1996-03-08
申请号：JP16515295
申请日：1995-06-30
Applicant: BASF MAGNETICS GMBH
Inventor： AUGUSUTO REENAA , RIA KURESU , ARUBERUTO KOORU , MIHIYAERU HITSUTSUFUERUTO
IPC: C09D5/23 , C09D175/00 , C09D175/04 , C09D175/14 , C09D175/16 , G11B5/702
Abstract: PURPOSE: To form a magnetic recording medium of dispersion liquid which is extremely stable even after being stored for a long period for magnetic recording medium manufacture and obtain wear resistance which is improved even in high-temperature, high-humidity conditions. CONSTITUTION: As for the magnetic recording medium which has a magnetizable layer formed on a nonmagnetic substrate, magnetic powder is dispersed in a binder mixture, which consists of (A) 3 to 35% polyurethane urena (meth) acrylate, (B) 5 to 97% anion-group containing polyurena urethane, and (C) a 15 to 60% general polymer binder containing no ion group.
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公开(公告)号：JPH07201032A
公开(公告)日：1995-08-04
申请号：JP23658394
申请日：1994-09-30
Applicant: BASF MAGNETICS GMBH
Inventor： GUREEGORU BUROTO , ATEIRA BUASU , BUERUNAA ROTSUHO , AUGUSUTO REENAA , BUERUNAA RENTSU , NORUBERUTO SHIYUNAIDAA
IPC: C08G18/10 , C08G18/62 , C08G18/78 , C09D5/23 , C09D175/00 , C09D175/04 , G11B5/702
Abstract: PURPOSE: To enhance wear resistance and residual magnetic induction at and under a high temp. and high humidity and to obtain a defectless layer surface and a narrow magnetic field intensity distribution by using OH group-contg. polyurea urethane and polyurethane urea (meth)acrylate as a binder compsn. in a magnetic layer. CONSTITUTION: The polyurethane urea (meth)acrylate consists of poly (meth) acrylate having terminal OH groups up to two pieces per mol and a mol.wt. of 200 to 50000, 0.1 to 10wt.% diisocyanate, 30 to 80wt.% triisicyanate, 20 to 60wt.% isocyanate exhibiting functional 4 to 10. The polyurea (meth)acrylate is brought into reaction with an aliphat. polyisocyanate mixture having average functionality of NCO groups of 3 to 6 pieces per mol. The NCO groups of 2 to 3 pieces per piece of the OH group react and the residual NCO groups are converted to a substd. terminal urea group having multifunctional amine or plural kinds of the multifunctional amine mixture varying from each other.
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公开(公告)号：JPH05334657A
公开(公告)日：1993-12-17
申请号：JP33288392
申请日：1992-12-14
Applicant: BASF MAGNETICS GMBH
Inventor： NORUBERUTO SHIYUNAIDAA , AUGUSUTO REENAA , URUZURA KURAIN , BUERUNAA RENTSU , BUERUNAA BARUTSU , ARUBERUTO KOORU , GIYUNTAA BETEINGAA
Abstract: PURPOSE: To provide a magnetic recording medium low in surface roughness, excellent in wear resistance of layer surface, having magnetic layer stability at a high temp. of 85 deg.C and high humidity condition and capable of preventing the lowering of output level and the block of a tape in an extreme operating condition. CONSTITUTION: The magnetic recording medium is obtained by preparing dispersion, in which an anisotropic magnetic material, and usual additives are dispersed in a polymer binder solution in an organic solvent, applying on a non- magnetic base body to film form, orienting by placing the anisotropic magnetic material in magnetic field and hardening the formed magnetic layer. And 0.3-5wt.% finely pulverized polysilicic acid made hydrophobic by a chemically bonded carbon is allowed to exist in the magnetic layer.
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Patent Agency Ranking
公开(公告)号：JPH09216928A
公开(公告)日：1997-08-19
申请号：JP29093196
申请日：1996-10-31
Applicant: BASF MAGNETICS GMBH
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公开(公告)号：JPH0836735A
公开(公告)日：1996-02-06
申请号：JP356795
申请日：1995-01-12
Applicant: BASF MAGNETICS GMBH
Inventor： GUREEGORU BUROTO , TOOMASU BUYUNSHIYU , AUGUSUTO REENAA , ARUBERUTO KOORU
Abstract: PURPOSE: To provide a bonding agent having an average molecular weight in a specified range, excellent mechanical property and a high crosslinking rate, by causing a reaction between specified polyurethane and a specified compound having an amino group reactive to an isocyanate group. CONSTITUTION: Polyurethane is made of 1mol of diol having an average molecular weight of 400-4000, 0.1-10mol of aliphatic/alicyclic diol, 0.01-10mol of aromatic diol, 0.01-2mol of trivalent alcohol, 0.01-8mol of polyvalent alcohol, and diisocyanate having a mol ratio with respect to all hydroxyl groups of 1.05:1 to 1.4:1. Aliphatic/alicyclic diol has 2-18 carbon atoms, and aromatic diol has 8-16 carbon atoms. By causing a reaction between this polyurethane and a compound having a hydroxyl group and an amino group reactive to an isocyanate group, a suitable composition for a crosslinkable coupling agent for forming a magnetic powder layer, containing a material having an average molecular weight of 25000-150000, may be provided.
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公开(公告)号：JPH06208719A
公开(公告)日：1994-07-26
申请号：JP24502693
申请日：1993-09-30
Applicant: BASF MAGNETICS GMBH
Inventor： AUGUSUTO REENAA , NORUBERUTO SHIYUNAIDAA , BUERUNAA BARUTSU , BUERUNAA RENTSU , MIHIYAERU BOBURITSUHI , ARUBERUTO KOORU
IPC: C09D5/23 , C09D133/04 , C09D133/16 , G11B5/702 , G11B5/708
Abstract: PURPOSE: To obtain a magnetic recording medium having stability to he degradation in the chemical quality without deteriorating its magnetic characteristics by forming magnetic layers having a prescribed softening point and incorporating perfluoroacrylate of a prescribed weight of the weight of chromium dioxide into these layers. CONSTITUTION: This magnetic recording medium is formed of a nonmagnetic substrate and at least one layer of the magnetic layers which are applied on this substrate, are formed of a magnetic material well dispersed into a polymer binder and known additives and contain at least 30wt.% ferromagnetic chromium dioxide. The magnetic layers contain the perfluoroacrylate having the softening point of >=110 deg.C at 0.1 to 8wt.% of the weight of the chromium dioxide. The magnetic layers preferably contain the perfluoroacrylate having the softening point of >=120 deg.C at 0.4 to 4wt.% of the weight of the chromium dioxide. As a result, the magnetic recording medium mainly contg. the chromium dioxide which does not deteriorate the magnetic characteristics, has the improved stability to the degradation in the chemical quality and does not impair the mechanical characteristics in spite of a temp. changing at a high temp. is obtd.
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公开(公告)号：JPH06195683A
公开(公告)日：1994-07-15
申请号：JP20617093
申请日：1993-08-20
Applicant: BASF MAGNETICS GMBH
Inventor： AUGUSUTO REENAA , NORUBERUTO SHIYUNAIDAA , HERUMAN RORAA , BUERUNAA BARUTSU , BUERUNAA RENTSU , ARUBERUTO KOORU , RAINHARUTO SHIYUTORANSUKII
Abstract: PURPOSE: To suppress the wear of a head by forming a magnetic layer contg. a fine powdery org. hydrophobic pigment insoluble in a solvent used and having >90 deg.C m.p. by 0.1-8wt.% of the amt. of a magnetic material. CONSTITUTION: A magnetic dispersion liq. contg. a fine powdery org. hydrophobic pigment, PE or PP having a mol.wt. of 500-7,000 as a binder and an anisotropic magnetic material in an org. solvent is prepd. The pigment is insoluble in the solvent and has >=90 deg.C m.p. and a fine powdery spherical pigment having 90 deg.C m.p. is advantageously used. The pigment is contained by 0.1-8wt.% of the amt. of the magnetic material. A nonmagnetic substrate is coated with the dispersion liq., the anistropic magnetic material is oriented in a magnetic field and the resultant magnetic layer is solidified. The objective medium producing no harmful effect on mechanical properties is obtd. without deteriorating magnetic properties.
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公开(公告)号：JPH06176349A
公开(公告)日：1994-06-24
申请号：JP20616993
申请日：1993-08-20
Applicant: BASF MAGNETICS GMBH
Inventor： AUGUSUTO REENAA , NORUBERUTO SHIYUNAIDAA , HERUMAN RORAA , BUERUNAA BARUTSU , BUERUNAA RENTSU , ARUBERUTO KOORU
IPC: C09D183/04 , C09D5/23 , C10M107/04 , C10M107/06 , C10M107/50 , C10N40/18 , G11B5/708 , G11B5/71
Abstract: PURPOSE: To obtain a magnetic recording medium which exhibits lower head wear, less water absorption and improved scratching flaw resistance even at and under a high temp., fluctuating temp. load and atm. humidity and improved use characteristics, such as lessened oscillation, at the time of tape travel and is not damaged and degraded in its magnetic properties. CONSTITUTION: The dispersion of an anisotropic magnetic material and ordinary additives is prepd, in the polymer binder soln. in an org. solvent. This dispersion is applied in a laminar form on a substrate with which the magnetization is infeasible. Further, the anisotropic magnetic material is oriented in a magnetic field and the applied magnetic layer is solidified, by which the magnetic layer is obtd. The magnetic layer formed in such a manner includes org. hydrophobic supporting pigments of fine powder and highly viscous polysiloxane.
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