公开(公告)号：US4325739A

公开(公告)日：1982-04-20

申请号：US204682

申请日：1980-11-05

申请人： Hans-Peter Biermann ,  Helmut Steinberger ,  Artur Botta ,  Rolf Naumann ,  Lutz Leitner ,  Heinrich Heine

发明人： Hans-Peter Biermann ,  Helmut Steinberger ,  Artur Botta ,  Rolf Naumann ,  Lutz Leitner ,  Heinrich Heine

IPC分类号： B22F1/02 ,  C09D5/23 ,  H01F1/06 ,  C04B31/28

CPC分类号： H01F1/061 ,  B22F1/02 ,  Y10T428/257 ,  Y10T428/2995

摘要： A pigment of a magnetic metal or alloy thereof carrying, in about 0.2 to 30% of the weight of the metal or alloy, a coating of at least one member selected from the group consisting of an ortho-silicic acid ester, a hydrolyzate thereof and a condensation product thereof. Optionally it also carries a corrosion inhibitor. The coated pigment is produced by suspension of the untreated pigment in a liquid medium containing the ortho-silicic acid ester or derivative thereof, and optionally the corrosion inhibitor, followed by separation and drying at 50.degree. to 250.degree. C. The resulting pigment is non-pyrophoric and of high performance properties suitable for use in magnetic recording media.

摘要翻译： 一种磁性金属或其合金的颜料，以约0.2至30重量％的金属或合金的比例携带至少一种选自正硅酸酯，其水解产物和 其缩合产物。 任选地，它还带有腐蚀抑制剂。 涂覆的颜料通过将未处理的颜料悬浮在含有原硅酸酯或其衍生物的液体介质中，任选地是腐蚀抑制剂，然后在50至250℃下分离和干燥而制备。所得颜料为非 - 适用于磁记录介质的高性能特性。

公开(公告)号：US4297395A

公开(公告)日：1981-10-27

申请号：US110876

申请日：1980-01-10

申请人： Gunter Buxbaum ,  Heinrich-Christian Schopper ,  Lutz Leitner ,  Volker Hahnkamm

发明人： Gunter Buxbaum ,  Heinrich-Christian Schopper ,  Lutz Leitner ,  Volker Hahnkamm

IPC分类号： C01G49/02 ,  C01G49/00 ,  C09D5/23 ,  C09D7/12 ,  G11B5/70 ,  G11B5/706 ,  H01F1/10 ,  H01F1/11

CPC分类号： G11B5/70694

摘要： A cobalt-doped, acicular ferrimagnetic iron oxide having an FeO content of about 16 to 24%, by weight, and a cobalt content of about 0.7 to 2.4%, by weight, the coercive force amounting to at least about 425 Oe+175 Oe/%, by weight, of Co is produced by precipitating and oxidizing a cobalt-containing aqueous iron (ii) salt solution, reducing the precipitate to Fe.sub.3 O.sub.4, partially reoxidizing to adjust the FeO content and heat treating under inert conditions at a temperature from about 600.degree. to 800.degree. C.

摘要翻译： 钴掺杂的针状亚铁磁性氧化铁，其FeO含量为约16至24重量％，钴含量为约0.7至2.4重量％，矫顽力为至少约425Oe + 175Oe /重量％的Co通过沉淀和氧化含钴的铁水（ii）盐溶液而产生，将沉淀物还原成Fe 3 O 4，部分再氧化以调节FeO含量并在惰性条件下在约 600〜800℃

公开(公告)号：US4853289A

公开(公告)日：1989-08-01

申请号：US93763

申请日：1987-09-08

申请人： Peter Schick ,  Friedrich Jonas ,  Lutz Leitner

发明人： Peter Schick ,  Friedrich Jonas ,  Lutz Leitner

IPC分类号： C09C1/48 ,  C09D5/08 ,  C09D5/23 ,  C09D7/12 ,  C10M105/24 ,  C10N40/18 ,  G11B5/702 ,  G11B5/71

CPC分类号： G11B5/71 ,  Y10S428/90 ,  Y10T428/30

摘要： An improved magnetic dispersion for magnetic recording which comprises magnetic pigment, abrasive, carbon black or another additive for regulating conductivity, binder, solvent, lubricant, and wetting agent, wherein the improvement comprises quantities of wetting agent, lubricant, or both being between at least 100 to 140% of the individually determined saturation adsorptions of the wetting agent and lubricant, with the proviso that the minimum quantity of wetting agent or lubricant is 80% of the individually determined saturation adsorption.

摘要翻译： 用于磁记录的改进的磁分散体，其包括磁性颜料，研磨剂，炭黑或用于调节电导率的粘合剂，溶剂，润滑剂和润湿剂的另一种添加剂，其中改进包括数量的润湿剂，润滑剂或两者之间至少 润湿剂和润滑剂的单独确定的饱和吸附的100至140％，条件是最小量的润湿剂或润滑剂是单独测定的饱和吸附的80％。

公开(公告)号：US4631090A

公开(公告)日：1986-12-23

申请号：US740090

申请日：1985-05-31

申请人： Rolf Naumann ,  Lutz Leitner ,  Jakob Rademachers ,  Gunter Buxbaum

发明人： Rolf Naumann ,  Lutz Leitner ,  Jakob Rademachers ,  Gunter Buxbaum

IPC分类号： B22F9/22 ,  C09D5/23 ,  C09D7/12 ,  C22C38/00 ,  G11B5/708 ,  G11B5/712 ,  G11B5/84 ,  G11B5/842 ,  H01F1/06 ,  C04B14/00 ,  C01G49/08 ,  C04B35/26

CPC分类号： G11B5/712 ,  H01F1/06 ,  H01F1/065

摘要： A magnetic pigment consisting essentially of iron, having an X-ray crystallite size with the 110 reflex of from 14 to 22 nm, a coercive force from 55 to 88 kA/m and a switching field distribution of the oriented pigment particles of less than 0.55 is produced by precipitating an iron (II)-salt with a super-stoichiometric quantity of an aqueous alkali metal carbonate solution and oxidizing it to produce .alpha.-FeOOH, .gamma.-Fe.sub.2 O.sub.3, Fe.sub.3 O.sub.4 or betholoid iron oxides, subsequently reducing it to the metal, and providing the iron oxides or oxide hydroxides with an inorganic protection from sintering at the latest during reduction.

摘要翻译： 一种主要由铁组成的磁性颜料，具有X射线微晶尺寸，其反射率为14至22nm，矫顽力为55至88kA / m，取向颜料颗粒的切换场分布小于0.55 通过用超化学计量的碱金属碳酸盐水溶液沉淀铁（II） - 盐，并将其氧化以产生α-FeO​​OH，γ-Fe 2 O 3，Fe 3 O 4或氧化铝铁氧化物，随后将其还原成金属， 并且在还原期间最终提供具有无机保护的氧化铁或氧化物氢氧化物以免烧结。

公开(公告)号：US4140539A

公开(公告)日：1979-02-20

申请号：US817079

申请日：1977-07-18

申请人： Franz Hund ,  Gunter Buxbaum ,  Lutz Leitner ,  Ingo Pflugmacher

发明人： Franz Hund ,  Gunter Buxbaum ,  Lutz Leitner ,  Ingo Pflugmacher

IPC分类号： C09C1/22 ,  C01G49/00 ,  C01G49/02 ,  C09C1/00 ,  C09C1/24 ,  G11B5/706 ,  C04B35/26

CPC分类号： C09C1/24 ,  G11B5/70647 ,  G11B5/70652 ,  G11B5/70673 ,  C01P2002/30 ,  C01P2006/42

摘要： An acicular to prismatic ferrimagnetic iron oxide pigment with a porosity of less than about 10% by volume, and optionally containing up to about 15% by weight of other metal oxides such as Zn or especially Co, are produced by heating a suspension of iron(III)oxide hydroxide in an autoclave to a temperature above about 100.degree. C in the presence of at least one mono-, di- or tri-saccharide, at least one alkali metal or alkaline earth metal hydroxide or carbonate and excess water, and washing, filtering and drying the resulting pigments.

摘要翻译： 通过加热铁的悬浮液（以下）制备孔隙率小于约10体积％的针状至棱柱型亚铁磁性氧化铁颜料，并且任选地含有至多约15重量％的其它金属氧化物如Zn或特别是Co， III）氧化物氢氧化物在高于约100℃的温度下，在至少一种一糖，二糖或三糖，至少一种碱金属或碱土金属氢氧化物或碳酸盐和过量的水的存在下进行，并洗涤 ，过滤并干燥所得颜料。

公开(公告)号：US3947502A

公开(公告)日：1976-03-30

申请号：US322819

申请日：1973-01-11

申请人： Lutz Leitner ,  Franz Hund

发明人： Lutz Leitner ,  Franz Hund

IPC分类号： C01G49/06 ,  G11B5/706 ,  H01F1/11 ,  C01G49/02

CPC分类号： G11B5/70663 ,  C01G49/06 ,  G11B5/70642 ,  G11B5/70657 ,  C01P2004/10 ,  C01P2006/42 ,  C01P2006/80

摘要： In the production of acicular, ferromagnetic iron oxide of high coercive force by oxidizing an iron (II)-hydroxide suspension with an oxygen-containing gas to form acicular iron (III) oxide hydroxide and dehydrating the iron (III) oxide hydroxide, optionally tempering, reducing and/or reoxidizing this into magnetic iron oxide, the improvement which comprises effecting the oxidation of the iron (II)-hydroxide suspension at a pH of at least about 13, the suspension including SiO.sub.2 in the form of a sol or soluble salt, the resulting iron (III) oxide hydroxide having SiO.sub.2 deposited thereon.

摘要翻译： 在通过用含氧气体氧化铁（II） - 氢氧化物悬浮液以形成氧化氢氧化物的针状铁（III）和使氧化氢（III）氢氧化物脱水，生产具有高矫顽力的铁磁性氧化铁，任选回火 ，将其还原和/或再氧化成磁性氧化铁，其改进包括在至少约13的pH下进行铁（II） - 氢氧化物悬浮液的氧化，所述悬浮液包括溶胶或可溶性盐形式的SiO 2 ，所得到的沉积有SiO 2的氧化铁（III）氢氧化物具有SiO 2。

公开(公告)号：US4369265A

公开(公告)日：1983-01-18

申请号：US160782

申请日：1980-06-18

申请人： Gunter Buxbaum ,  Ottfried Schlak ,  Franz Hund ,  Lutz Leitner

发明人： Gunter Buxbaum ,  Ottfried Schlak ,  Franz Hund ,  Lutz Leitner

IPC分类号： C09C1/24 ,  C09C3/00 ,  C09C3/12 ,  C09D5/23 ,  C09D9/00 ,  C09D11/00 ,  C09D11/02 ,  G11B5/706 ,  G11B5/712 ,  H01F1/06

CPC分类号： G11B5/70647 ,  C09C1/24 ,  C09C3/12 ,  G11B5/712 ,  H01F1/061 ,  C01P2004/84 ,  C01P2006/42 ,  Y10T428/2991 ,  Y10T428/2995

摘要： Readily dispersible finely divided solids such as pigments, coated with an organo-silicone polymer of the formula ##EQU1## wherein R.sup.I, R.sup.II, R.sup.III each independently is an optionally halogenated alkyl, alkenyl or aryl radical having from 1 to 10 carbon atoms;R.sup.IV is an alkyl or alkenyl radical having from 9 to 24 carbon atom;R.sup.V is an alkyl or alkenyl radical having from 1 to 8 carbon atoms;the sum of a+b+c is from 1 to about 1.95;d is a number from about 0.2 to 2;e and f each independently is a number from 0 to 1;the sum of d+e+f is from about 0.2 to 2; andthe sum of a+b+c+d+e+f is up to 3.

摘要翻译： 易于分散的细分固体如颜料，涂覆有下式的有机硅聚合物：其中RI，RII，RIII各自独立地为具有1-10个碳原子的任意卤代的烷基，烯基或芳基; RIV是具有9-24个碳原子的烷基或烯基; RV是具有1至8个碳原子的烷基或烯基; a + b + c的和为1〜约1.95; d为约0.2至2的数; e和f各自独立地为0至1的数; d + e + f的和为约0.2〜2; 并且a + b + c + d + e + f的和高达3。