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1. 发明授权

US5480570A Low coercive iron oxide pigments and a process for their preparation 失效
标题翻译：低矫顽性氧化铁颜料及其制备方法
公开(公告)号：US5480570A
公开(公告)日：1996-01-02
申请号：US254471
申请日：1994-06-06
申请人： Karl-Heinz van Bonn , Hendrik Kathrein , Gerhard Franz
发明人： Karl-Heinz van Bonn , Hendrik Kathrein , Gerhard Franz
IPC分类号： C01G49/00 , C01G49/02 , C09D5/23 , C09D7/12 , G11B5/706 , G11B5/712 , H01F1/11 , H01F1/10
CPC分类号： G11B5/70694 , C01G49/02 , G11B5/712 , C01P2004/10 , C01P2004/82 , C01P2004/84 , C01P2006/12 , Y10T428/2991
摘要： Cobalt coated, needle shaped berthollide iron oxide pigments are disclosed which have a core of the composition (Fe.sub.x.sup.2+, Fe.sub.2.sup.3+)O.sub.3+x wherein 0.3
摘要翻译：公开了钴包覆的针状贝氏体氧化铁颜料，其具有组成的核心（Fex2 +，Fe23 +）O3 + x，其中0.3

2. 发明授权

US5116419A Process for the preparation of magnetic iron oxides and the pigments obtained therefrom 失效
标题翻译：制备磁铁氧化物的方法及其获得的颜料
公开(公告)号：US5116419A
公开(公告)日：1992-05-26
申请号：US448505
申请日：1989-12-11
申请人： Hendrik Kathrein , Peter Kiemle
发明人： Hendrik Kathrein , Peter Kiemle
IPC分类号： C01G49/00 , C09C1/22 , C09C1/24 , G11B5/706
CPC分类号： G11B5/70694 , C09C1/24 , G11B5/70673 , C01P2002/30 , C01P2004/84
摘要： Magnetic iron oxide pigments useful in manufacturing magnetic recording media are prepared by a method which comprises coating a magnetic iron oxide core particle material having the composition FeO, wherein x is from 1.33 to 1.5, in a first step with a preliminary coating of a cobalt-containing bertholloid material or a material having the composition Co.sub.x Fe.sup.II.sub.l-x Fe.sup.III.sub.2 O.sub.4 wherein x is greater than zero but less than or equal to 1 and then in a second step the preliminary coated particle is coated with a cobalt compound.
摘要翻译：可用于制造磁记录介质的磁性氧化铁颜料通过以下方法制备：在第一步骤中，涂覆具有组成为FeO的组成为FeO的磁性氧化铁芯颗粒材料，其中x为1.33至1.5，含有贝壳体材料或具有组成CoxFeII1-xFeIII2O4的材料，其中x大于零但小于或等于1，然后在第二步骤中，预涂覆的颗粒涂覆有钴化合物。

3. 发明授权

US4857417A Cobalt-containing iron oxide magnetic particles and method for the preparation of the same 失效
标题翻译：含钴氧化铁磁性颗粒及其制备方法
公开(公告)号：US4857417A
公开(公告)日：1989-08-15
申请号：US141073
申请日：1988-01-05
申请人： Susumu Kitaoka , Haruo Andoh , Junichi Hirata
发明人： Susumu Kitaoka , Haruo Andoh , Junichi Hirata
IPC分类号： G11B5/706
CPC分类号： G11B5/70694 , Y10S428/90 , Y10T428/2991
摘要： Cobalt-containing iron oxide magnetic particles having a high coercive force and a small surface electrical resistance which are useful as a recording element for a magnetic recording medium, and a method for the preparation of the same comprising reducing acicular .gamma.-Fe.sub.2 O.sub.3 particles in a reducing gas or liquid until the iron oxide reaches an intermediate oxidation state between .gamma.-Fe.sub.2 O.sub.3 and Fe.sub.3 O.sub.4, dispersing the resulting iron oxide particles into an aqueous solution containing a cobalt salt and optionally a ferrous salt and an alkali of one equivalent or more to the metal salt(s), and heating the mixture at a temperature of higher than room temperature up to a boiling point of the mixture under an atmospheric condition such that the divalent iron is substantially not oxidized. The cobalt is thereby predominantly incorporated into the most outer layer of the acicular iron oxide particles.
摘要翻译：可用作磁记录介质的记录元件的具有高矫顽力和小表面电阻的含钴氧化铁磁性颗粒及其制备方法包括还原针状γ-Fe2O3颗粒的还原性气体或液体，直到氧化铁在γ-Fe 2 O 3与Fe 3 O 4之间达到中间氧化态，将得到的氧化铁颗粒分散到含有钴盐和任选的亚铁盐和一当量或更多的碱金属盐的水溶液中并在大气条件下在高于室温的温度下将该混合物加热到混合物的沸点，使得二价铁基本上不被氧化。因此，钴主要并入针状氧化铁颗粒的最外层。

4. 发明授权

US4267207A Process for producing cobalt-containing ferromagnetic iron oxide powder 失效
标题翻译：含钴铁磁性氧化铁粉末的生产工艺
公开(公告)号：US4267207A
公开(公告)日：1981-05-12
申请号：US39028
申请日：1979-05-14
申请人： Koji Sasazawa , Tatsuji Kitamoto , Goro Akashi , Kouichi Masaki , Shinichiro Dezawa
发明人： Koji Sasazawa , Tatsuji Kitamoto , Goro Akashi , Kouichi Masaki , Shinichiro Dezawa
IPC分类号： C01G49/00 , C01G49/02 , G11B5/706 , H01F1/11 , B05D5/12
CPC分类号： G11B5/70694 , C01G49/02 , G11B5/70642 , C01P2006/42
摘要： A process for producing a cobalt-containing ferromagnetic iron oxide powder suitable for magnetic recording which comprises(a) mixing cobalt ion, ferrous ion and an alkali with an aqueous dispersion of acicular ferromagnetic iron oxide nuclei under non-oxidizing conditions at a temperature of about 50.degree. C. or less;(b) heating the dispersion to a temperature of at least about 60.degree. C. but below the boiling point of the dispersion under non-oxidizing conditions to cause a reaction; and(c) treating the dispersion at a temperature of at least about 60.degree. C. but below the boiling point of the dispersion under the following conditions:(1) initially treating the dispersion under non-oxidizing conditions for about 5 minutes or more;(2) subsequentially treating the dispersion under oxidizing conditions for about 5 minutes or more prior to the termination of the reaction; and(3) a total treating time under non-oxidizing conditions and oxidizing conditions of at least about 30 minutes.
摘要翻译：一种适用于磁记录的含钴铁磁性氧化铁粉末的制造方法，其特征在于，包括：（a）在非氧化条件下，将钴离子，亚铁离子和碱与针状铁磁性氧化铁核的水分散体混合， 50℃以下; （b）在非氧化条件下将分散体加热到至少约60℃但低于分散体的沸点以引起反应; 和（c）在以下条件下，在至少约60℃但低于分散体沸点的温度下处理分散体：（1）最初在非氧化条件下处理分散体约5分钟或更长时间; （2）在反应终止之前，在氧化条件下将分散体顺序处理约5分钟或更长时间; 和（3）在非氧化条件和氧化条件下的总处理时间为至少约30分钟。

5. 发明授权

US3725126A Magnetic recording tape 失效
标题翻译：磁记录带
公开(公告)号：US3725126A
公开(公告)日：1973-04-03
申请号：US3725126D
申请日：1970-12-28
申请人： MINNESOTA MINING & MFG
发明人： HALLER W , COLLINE R
IPC分类号： G11B5/706 , C04B35/26 , G11B5/78
CPC分类号： G11B5/70673 , G11B5/70694
摘要： MAGNETIC RECORDING TAPE HAVING A COATING OF ORIENTED MAGNETIZABLE PARTICLES IN A BINDER AFFORDING SUPERIOR ABILITY TO STORE HIGH FREQUENCY INFORMATION BY VIRTUE OF ORIENTED MAGNETIZABLE ACICULAR IRON OXIDE PARTICLES MODIFIED WITH SMALL AMOUNTS OF COBALT OXIDE, WHICH IRON OXIDE PARTICLES COMPRISE GAMMA-FE2O3. AT APPROXIMATELY TWO PARTS BY WEIGHT PER ONE PART OF BINDER AND PHYSICALLY ALIGNED, THE NOVEL PARTICLES PROVIDE IN THE ALIGNED DIRECTION A COERCIVITY HC EXCEEDING 350 OERSTEDS AND A BR EXCEEDING 800 GAUSS. HIGHER COERCIVITY MAY BE ATTAINED BY CONTROLLING THE HEATING STEPS IN MAKING THE NOVEL PARTICLES TO PROVIDE UP TO ABOUT 25% FEO BY WEIGHT OF THE TOTAL IRON OXIDE.

6. 发明授权

US5314750A Magnetic iron oxide particles and method of producing same 失效
标题翻译：磁性氧化铁颗粒及其制造方法
公开(公告)号：US5314750A
公开(公告)日：1994-05-24
申请号：US967522
申请日：1992-10-27
申请人： Atsushi Takedoi , Mamoru Tanihara , Tosiharu Harada , Masaru Isoai , Kazuhiro Fujita
发明人： Atsushi Takedoi , Mamoru Tanihara , Tosiharu Harada , Masaru Isoai , Kazuhiro Fujita
IPC分类号： G11B5/706 , C01G49/02 , H01F1/06
CPC分类号： G11B5/70694 , Y10S428/90 , Y10T428/2982 , Y10T428/2991 , Y10T428/2993
摘要： Disclosed herein are magnetic iron oxide particles which have a spindle shape and a substantially uniform particle size and shape, and are substantially free of dendrites and have a large axial ratio (major axial diameter/minor axial diameter) and an excellent print-through characteristic, and a method of producing the same.
摘要翻译：本文公开了具有纺锤形状和基本上均匀的粒度和形状的磁性氧化铁颗粒，并且基本上没有树枝状结构并且具有大的轴向比（主轴向直径/次轴向直径）和优异的印刷特性，及其制造方法。

7. 发明授权

US5236783A Superparamagnetic fine particles of iron oxide and magnetic recording media containing said particles 失效
标题翻译：含氧化铁的超级颗粒和含有颗粒的磁记录介质
公开(公告)号：US5236783A
公开(公告)日：1993-08-17
申请号：US657733
申请日：1991-02-20
申请人： Koso Aoki , Masaaki Fukugauchi , Tomoyuki Imai , Nanao Horiishi , Kazuyuki Hayashi
发明人： Koso Aoki , Masaaki Fukugauchi , Tomoyuki Imai , Nanao Horiishi , Kazuyuki Hayashi
IPC分类号： G11B5/706 , G11B5/712
CPC分类号： G11B5/712 , G11B5/70694 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/259 , Y10T428/2991 , Y10T428/2993
摘要： Disclosed herein is superparamagnetic fine particles of iron oxide having an unsaturated fatty acid adsorbed on the surface of superparamagnetic fine particles, and having a magnetization of not less than 50 emu/g, the rate of change of the magnetization of not more than 10%, and an Fe.sup.2+ content (calculated as Fe.sup.2+ /Fe.sup.3+ molar ratio) of 0.16-0.5.

8. 发明授权

US4497723A Preparation of acicular, ferrimagnetic iron oxides 失效
标题翻译：针状，亚铁磁性氧化铁的制备
公开(公告)号：US4497723A
公开(公告)日：1985-02-05
申请号：US508168
申请日：1983-06-27
申请人： Manfred Ohlinger , Guenter Vaeth , Peter Rudolf , Wilhelm Sarnecki , Helmut Jakusch , Eberhard Koester , Milena Melzer
发明人： Manfred Ohlinger , Guenter Vaeth , Peter Rudolf , Wilhelm Sarnecki , Helmut Jakusch , Eberhard Koester , Milena Melzer
IPC分类号： C01G49/02 , C01G49/06 , G11B5/706 , H01F1/11 , C01G49/08
CPC分类号： B82Y30/00 , C01G49/06 , G11B5/70694 , C01P2002/60 , C01P2004/10 , C01P2004/64 , C01P2006/12 , C01P2006/42
摘要： A process for the preparation of acicular ferrimagnetic iron oxides by reducing gamma-iron(III) oxide hydroxide to magnetite, at from 280.degree. to 620.degree. C., by means of an organic compound which is decomposable at this temperature in the presence of iron oxide, and, optionally, a stream of reducing gas, and, if desired, then oxidizing the magnetite with oxygen-containing gases, at from 150.degree. to 450.degree. C., to acicular ferrimagnetic iron oxide of the formula FeO.sub.x, where x is from above 1.33 to 1.50, wherein the organic compound used for the reduction is a non-polar glycerol ester of a fatty acid which is introduced into the aqueous reaction suspension during the preparation of the gamma-iron(III) oxide hydroxide.
摘要翻译：一种制备针状亚铁磁性氧化铁的方法，该方法是通过在这种温度下在铁存在下可分解的有机化合物将280℃至620℃的氧化氢氧化物还原成磁铁矿氧化物和任选的还原气体流，并且如果需要，然后用含氧气体在150℃至450℃下将磁铁矿氧化成式FeO x的针状亚铁磁性氧化铁，其中x为从1.33到1.50，其中用于还原的有机化合物是在制备γ-铁（III）氧化物氢氧化物期间引入到水性反应悬浮液中的非极性甘油酯脂肪酸酯。

9. 发明授权

US4276183A Cobalt modified magnetic iron oxide 失效
标题翻译：钴改性磁性氧化铁
公开(公告)号：US4276183A
公开(公告)日：1981-06-30
申请号：US54393
申请日：1979-07-02
申请人： David M. Wilson
发明人： David M. Wilson
IPC分类号： G11B5/706 , C01G49/02
CPC分类号： G11B5/70642 , G11B5/70684 , G11B5/70694 , Y10S428/90 , Y10T428/31786
摘要： Magnetic material comprising magnetic iron oxide modified with at least about 0.5 weight % cobalt, based on the weight of total product which when combined with a binder at a 75% by weight loading forms a magnetic recording member having an orientation ratio and coercivity value that corresponds to a coordinate value equal to or above the coordinate values on the FIGURE and an M-factor value between about -1.0 and +1.0. The magnetic material is preferred in which the amount of cobalt present is from about 0.5 to about 5.0 weight % based on the weight of total product and in which chromium is also present in an amount of from about 0.1 to about 0.3 weight percent based on the weight of total product. A magnetic impulse record member having such a magnetic material dispersed in a binding medium is also claimed.
摘要翻译：磁性材料包括用至少约0.5重量％的钴改性的磁性氧化铁，基于总产物的重量，当与75重量％的负载量的粘合剂组合时，其总重量与形成具有相应的取向比和矫顽力值的磁记录元件到等于或高于图上的坐标值的坐标值和约-1.0和+1.0之间的M因子值。磁性材料是优选的，其中存在的钴的量基于总产物的重量为约0.5至约5.0重量％，并且其中铬的存在量为约0.1至约0.3重量％，基于总产品重量。还要求具有分散在粘合介质中的这种磁性材料的磁脉冲记录部件。

10. 发明授权

US4221776A Manufacture of acicular ferrimagnetic iron oxides 失效
标题翻译：针状亚铁磁性氧化铁的制造
公开(公告)号：US4221776A
公开(公告)日：1980-09-09
申请号：US6528
申请日：1979-01-25
申请人： Horst Autzen , Helmut Jakusch , Eberhard Koester , Werner Loeser , Peter Rudolf , Wilhelm Sarnecki , Werner Steck
发明人： Horst Autzen , Helmut Jakusch , Eberhard Koester , Werner Loeser , Peter Rudolf , Wilhelm Sarnecki , Werner Steck
IPC分类号： C01G49/06 , G11B5/706
CPC分类号： C01G49/06 , G11B5/70642 , G11B5/70647 , G11B5/70652 , G11B5/70684 , G11B5/70694 , C01P2004/10 , C01P2006/12 , C01P2006/42
摘要： A process for the manufacture of acicular ferrimagnetic iron oxide by reducing heat-treated acicular iron(III) oxide hydroxide with an organic compound which decomposes in the presence of iron oxide at from 450.degree. to 650.degree. C., followed by at least partial oxidation with an oxygen-containing gas at from 200.degree. to 500.degree. C., wherein the iron(III) oxide hydroxide employed is heat-treated at from 450.degree. to 700.degree. C. and has a surface area, measured by the BET method, of from 10 to 23 m.sup.2 /g.
摘要翻译：一种通过用450℃至650℃在氧化铁存在下分解有机化合物的热处理的针状铁（III）氢氧化物还原热处理的针状铁磁性氧化铁的方法，然后至少部分氧化与含氧气体在200-500℃下反应，其中使用的氧化铁（III）氢氧化物在450-700℃下进行热处理，并且通过BET法测量的表面积，为10至23m2 / g。

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