公开(公告)号：US4058646A

公开(公告)日：1977-11-15

申请号：US609561

申请日：1975-09-02

申请人： Guenter Vaeth ,  Rudolf Bachmann ,  Heinrich Hartmann ,  Hans-Joerg Hartmann ,  Herbert Spoor ,  Karl Uhl ,  August Lehner ,  Winfried Gutermann ,  Herbert Motz

发明人： Guenter Vaeth ,  Rudolf Bachmann ,  Heinrich Hartmann ,  Hans-Joerg Hartmann ,  Herbert Spoor ,  Karl Uhl ,  August Lehner ,  Winfried Gutermann ,  Herbert Motz

IPC分类号： C08G18/00 ,  C08G18/65 ,  C08G18/66 ,  C09D5/23 ,  G11B5/702 ,  H01F10/02

CPC分类号： C08G18/6607 ,  C08G18/6611 ,  G11B5/7021 ,  Y10S428/90 ,  Y10T428/31565 ,  Y10T428/31591 ,  Y10T428/31605 ,  Y10T428/31609

摘要： The invention relates to magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment dispersed in a binder which contains at least 50 percent by weight of a special polyurethane elastomer.This polyurethane elastomer is a thermoplastic polyurethane which is soluble in tetrahydrofuran and free from isocyanate groups, and which has been manufactured from (A) 1 mole of one or more hydroxyl-containing polyesters and/or hydroxyl-containing polyethers of molecular weight from 600 to 4,000, (B) from 3.5 to 15 moles of a branched-chain aliphatic diol of 4 to 10 carbon atoms or a mixture of aliphatic diols of 2 to 10 carbon atoms, of which at least 50 mole percent is a branched-chain aliphatic diol of 4 to 10 carbon atoms, (C) from 0 to 1 mole, but not more than 15 mole percent of the aliphatic diols according to B, of an aliphatic polyol with from 3 to 6 OH groups and 3 to 18 carbon atoms, and (D) from 4.5 to 18 moles of a diisocyanate of 6 to 30 carbon atoms, the amount of NCO groups being approximately equivalent to the amount of OH groups of the sum of the components A to C.Magnetic recording media which contain such a polyurethane in the magnetic coating are distinguished by high surface hardness coupled with a markedly improved orientation ratio, a higher packing density and more uniform dispersion of the magnetic particles in the coating.

摘要翻译： 本发明涉及包含非磁性基底的磁记录介质，并施加到基于分散在粘合剂中的细分散的磁性颜料的牢固粘附的磁性涂层，其含有至少50重量％的特殊聚氨酯弹性体。

公开(公告)号：US4058506A

公开(公告)日：1977-11-15

申请号：US607099

申请日：1975-08-25

申请人： Guenter Vaeth ,  Rudolf Bachmann ,  Heinrich Hartmann ,  Herbert Spoor ,  August Lehner

发明人： Guenter Vaeth ,  Rudolf Bachmann ,  Heinrich Hartmann ,  Herbert Spoor ,  August Lehner

IPC分类号： C08G18/10 ,  C08G18/66 ,  C08G18/76 ,  C14C11/00 ,  C08G18/44 ,  C08G18/48

CPC分类号： C14C11/006 ,  C08G18/10 ,  C08G18/66 ,  C08G18/7657 ,  C08G18/7671

摘要： Thermoplastic, elastic polyurethanes which are soluble in ethers and/or ketones and have a high surface hardness and high modulus of elasticity are manufactured from a polyester-ol and/or a polyether-ol, a substituted or unsubstituted diisocyanato-diphenylmethane or diisocyanato-diphenylsulfone, an aliphatic, branched-chain diol of the formula HOCH.sub.2 --CR.sup.1 R.sup.2 --CO.sub.2 OH, in which R.sup.1 is alkyl and R.sup.2 is alkyl or hydrogen, and, optionally, a triol.

摘要翻译： 可溶于醚和/或酮并且具有高表面硬度和高弹性模量的热塑性弹性聚氨酯由聚酯 - 醇和/或聚醚 - 醇，取代或未取代的二异氰酸酯 - 二苯基甲烷或二异氰酸酯 - 二苯砜 ，式HOCH2-CR1R2-CO2OH的脂族支链二醇，其中R 1是烷基，R 2是烷基或氢，和任选的三醇。

公开(公告)号：US4357378A

公开(公告)日：1982-11-02

申请号：US234708

申请日：1981-02-17

申请人： Guenter Vaeth ,  Rudolf Bachmann ,  Werner Senkpiel ,  Hans-Joerg Hartmann ,  Roland Falk ,  Herbert Motz

发明人： Guenter Vaeth ,  Rudolf Bachmann ,  Werner Senkpiel ,  Hans-Joerg Hartmann ,  Roland Falk ,  Herbert Motz

IPC分类号： C09D5/23 ,  G11B5/702 ,  B32B3/02

CPC分类号： G11B5/7022 ,  Y10S428/90 ,  Y10T428/31605 ,  Y10T428/31609 ,  Y10T428/31699 ,  Y10T428/31935

摘要： The invention relates to magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment and a special binder mixture. This binder mixture consists essentially of 20 to 90 percent by weight of an elastomeric polyurethane which is soluble in a volatile organic solvent, is practically free of isocyanate groups and has been obtained from a linear, aliphatic polyester or polyether and a diisocyanate of 6 to 24 carbon atoms, and of 10 to 80 percent by weight of a vinyl chloride copolymer which contains 50 to 90 percent by weight of vinyl chloride units and 10 to 50 percent by weight of units of one or more diesters of maleic acid with an alcohol of 1 to 3 carbon atoms, or of the reaction product of this binder mixture with a polyisocyanate of 6 to 50 carbon atoms. Magnetic coatings containing such a binder mixture are distinguished by improved surface hardness coupled with improved orientability of the magnetic particles, as a result of which such recording media are particularly suitable for modern video- and audio-recording instruments.

摘要翻译： 本发明涉及包含非磁性基底的磁记录介质，并且在其上施加基于细分磁性颜料和特殊粘合剂混合物的牢固粘附的磁性涂层。 该粘合剂混合物基本上由20至90重量％的可溶于挥发性有机溶剂的弹性体聚氨酯组成，实际上不含异氰酸酯基团，并且由线性脂族聚酯或聚醚和6至24的二异氰酸酯获得 和10至80重量％的氯乙烯共聚物，其含有50至90重量％的氯乙烯单元和10至50重量％的一种或多种马来酸二醇与醇的共聚物1 或者该粘合剂混合物与6至50个碳原子的多异氰酸酯的反应产物。 含有这种粘合剂混合物的磁性涂层的特征在于改进的表面硬度以及磁性颗粒的改进的取向性，结果这种记录介质特别适用于现代的视频和音频记录仪器。

公开(公告)号：US4091143A

公开(公告)日：1978-05-23

申请号：US624580

申请日：1975-10-22

申请人： Hans Joerg Hartmann ,  Guenter Vaeth ,  Helmut Kopke

发明人： Hans Joerg Hartmann ,  Guenter Vaeth ,  Helmut Kopke

IPC分类号： G11B5/702 ,  G11B5/706 ,  H01F10/02

CPC分类号： G11B5/7028 ,  G11B5/70636 ,  Y10S428/90 ,  Y10T428/256

摘要： Magnetic recording media, the magnetic coating of which consists of a dispersion of elongated ferromagnetic chromium dioxide particles in an organic binder, the dispersions exhibiting particularly good storage stability. This is achieved by admixing 0.5 to 6% by weight, based on the amount of chromium dioxide pigment, of the zinc salt of an aliphatic carboxylic acid of 8 to 18 carbon atoms, during the manufacture of the chromium dioxide dispersions. Chromium dioxide dispersions with good storage stability and a high degree of orientation of the elongated magnetic particles in the magnetic coating are thus obtained in a simple manner.

摘要翻译： 磁记录介质，其磁性涂层由细长的铁磁性二氧化铬颗粒在有机粘合剂中的分散体组成，分散体表现出特别好的储存稳定性。 这是通过在二氧化铬分散体的制造过程中将基于二氧化铬颜料的含量为0.5至6重量％的8至18个碳原子的脂族羧酸的锌盐混合而实现的。 因此，以简单的方式获得具有良好的储存稳定性和磁性涂层中细长磁性颗粒的高取向度的二氧化铬分散体。

公开(公告)号：US4464352A

公开(公告)日：1984-08-07

申请号：US448489

申请日：1982-12-10

申请人： Horst Autzen ,  Herbert Motz ,  Peter Rudolf ,  Wilhelm Sarnecki ,  Werner Steck ,  Guenter Vaeth

发明人： Horst Autzen ,  Herbert Motz ,  Peter Rudolf ,  Wilhelm Sarnecki ,  Werner Steck ,  Guenter Vaeth

IPC分类号： C01G49/06 ,  G11B5/706

CPC分类号： C01G49/06 ,  G11B5/70642 ,  G11B5/70652 ,  G11B5/70663 ,  C01P2004/10 ,  C01P2006/12 ,  C01P2006/42

摘要： A process for the manufacture of acicular ferrimagnetic iron oxide by converting acicular iron(III) oxide hydroxide at from 300.degree. to 650.degree. C., by treatment with an organic compound which decomposes in this temperature range in the presence of iron oxide, the iron(III) oxide hydroxide used for the reaction being a lepidocrocite which has been heat-treated at from 300.degree. to 700.degree. C.

摘要翻译： 通过用在氧化铁存在下在该温度范围内分解的有机化合物处理，将300至650℃的针状氧化铁（III）氢氧化物转化成针状亚铁磁性氧化铁的方法， 用于该反应的氧化氢氧化物（III）是在300〜700℃下进行热处理的氯铁矿石。

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。

公开(公告)号：US4755395A

公开(公告)日：1988-07-05

申请号：US859902

申请日：1986-05-05

申请人： Werner Steck ,  Rainer Feser ,  Werner Loeser ,  Peter Rudolf ,  Guenter Vaeth ,  Helmut Jakusch ,  Jenoe Kovacs

发明人： Werner Steck ,  Rainer Feser ,  Werner Loeser ,  Peter Rudolf ,  Guenter Vaeth ,  Helmut Jakusch ,  Jenoe Kovacs

IPC分类号： C01G49/00 ,  C01G49/06 ,  C09D5/23 ,  G11B5/706 ,  H01F1/11

CPC分类号： G11B5/70673

摘要： The preparation of acicular ferrimagnetic iron oxides which contain cobalt and phosphate ions and, if desired, further additives, and their use for manufacturing magnetic recording media.

摘要翻译： 制备含有钴和磷酸根离子的针状亚铁磁性氧化物，如果需要，还可制备其它添加剂及其制造磁记录介质的用途。

公开(公告)号：US4755315A

公开(公告)日：1988-07-05

申请号：US14172

申请日：1987-02-12

申请人： Werner Steck ,  Rainer Feser ,  Helmut Jakusch ,  Peter Rudolf ,  Guenter Vaeth ,  Udo Kullmann

发明人： Werner Steck ,  Rainer Feser ,  Helmut Jakusch ,  Peter Rudolf ,  Guenter Vaeth ,  Udo Kullmann

IPC分类号： C01G49/00 ,  G11B5/706 ,  H01F1/10 ,  C01G49/06

CPC分类号： G11B5/70673

摘要： A process for the preparation of cobalt-containing isotropic magnetic iron oxides which are based on gamma-iron(III) oxide, contain from 2 to 7% by weight of cobalt(II) ions and less than 2% by weight of Fe(II) ions, the percentages in each case being based on the iron oxide, and have a particle length of from 0.08 to 0.30 .mu.m, a length/width ratio of from 1.5 to 3.5:1 and a specific remanent magnetization after saturation of not less than 60 nTm.sup.3 /g.

摘要翻译： 制备基于γ-氧化铁（III）的含钴各向同性磁性氧化铁的方法含有2至7重量％的钴（II）离子和小于2重量％的Fe（II ）离子，每种情况下的百分比基于氧化铁，并且具有0.08至0.30μm的长度，1.5至3.5:1的长宽比和饱和后的特定剩余磁化强度不小于 超过60 nTm3 / g。

公开(公告)号：US4729785A

公开(公告)日：1988-03-08

申请号：US856972

申请日：1986-04-29

申请人： Ekkehard Schwab ,  Werner Steck ,  Peter Rudolf ,  Guenter Vaeth ,  Helmut Jakusch ,  Jenoe Kovacs

发明人： Ekkehard Schwab ,  Werner Steck ,  Peter Rudolf ,  Guenter Vaeth ,  Helmut Jakusch ,  Jenoe Kovacs

IPC分类号： H01F1/06 ,  B22F9/22 ,  B22F9/24 ,  G11B5/706 ,  C22C1/04

CPC分类号： G11B5/70615

摘要： Acicular metal particles consisting essentially of iron are prepared by reducing .alpha.-iron(III) oxide obtained--by dehydration--from acicular iron(III) oxide hydroxide prepared in the presence of phosphate ions and having a shape-stabilizing surface coating.

摘要翻译： 基本上由铁组成的针状金属颗粒通过还原由磷酸根离子制备的具有形状稳定表面涂层的针状氧化铁（III）氧化物氢氧化物脱水获得的α-铁（III）氧化物来制备。

公开(公告)号：US4061726A

公开(公告)日：1977-12-06

申请号：US732901

申请日：1976-10-15

申请人： Manfred Ohlinger ,  Eduard Schoenafinger ,  Guenter Vaeth ,  Heinz Stritzinger ,  Eberhard Koester ,  Hans Henning Schneehage ,  Werner Steck

发明人： Manfred Ohlinger ,  Eduard Schoenafinger ,  Guenter Vaeth ,  Heinz Stritzinger ,  Eberhard Koester ,  Hans Henning Schneehage ,  Werner Steck

IPC分类号： C01G49/02 ,  C01G49/06 ,  C21B15/00 ,  G01N21/89 ,  G11B5/706 ,  H01F1/11

CPC分类号： G11B5/70652 ,  C01G49/06 ,  G01N21/8901 ,  G11B5/70647 ,  C01P2004/10 ,  C01P2004/51 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/42

摘要： Goethite is obtained by reacting an aqueous solution of an iron (II) salt with an aqueous solution of an alkali metal hydroxide and oxidizing the resulting iron(II) hydroxide. The oxidation is carried out in three stages. In the first stage, from 4 to 15% by weight are oxidized in the course of from 0.4 to 5 hours, in the second stage from 60 to 85% by weight are oxidized in the course of from 1.5 to 6 hours and in a third stage the remaining amount of iron is oxidized.

摘要翻译： 通过使铁（II）盐的水溶液与碱金属氢氧化物的水溶液反应并氧化得到的氢氧化铁（II），得到针铁矿。 氧化分三个阶段进行。 在第一阶段，4至15重量％在0.4至5小时的过程中被氧化，在第二阶段中，以60至85重量％的氧化为1.5至6小时， 阶段剩余量的铁被氧化。