-
公开(公告)号：US4061725A
公开(公告)日：1977-12-06
申请号：US732899
申请日：1976-10-15
CPC分类号： G11B5/70652 , C01G49/06 , G11B5/70647 , C01P2002/52 , C01P2004/10 , C01P2006/11 , C01P2006/42
摘要： Acicular gamma-iron(III) oxide is manufactured by reacting an iron(II) salt solution with an aqueous solution of an alkali metal hydroxide and oxidizing the resulting suspension of iron(II) hydroxide in three stages. In a first stage, at most from 0.1 to 4% by weight of the amount of iron(II) hydroxide originally present is oxidized in the course of from 0.1 to 4 hours, in a second stage from 10 to 25% by weight of the said original amount are oxidized in the course of from 1.5 to 6 hours and in a third stage the remaining amount is oxidized. After the oxidation, the goethite formed is reduced to magnetite and the latter is then oxidized to acicular gamma-iron(III) oxide.
摘要翻译： 通过使铁（II）盐溶液与碱金属氢氧化物的水溶液反应并将所得的氢氧化铁（II）悬浮液分三个阶段进行氧化，从而制造针状γ-铁（III）。 在第一阶段中，最初存在的氢氧化铁（II）的量的0.1至4重量％在0.1至4小时的过程中被氧化，在第二阶段中氧化为10至25重量％ 所述原始量在1.5至6小时的过程中被氧化，在第三阶段中剩余量被氧化。 氧化后，形成的针铁矿被还原成磁铁矿，后者被氧化成针状的γ-铁（III）氧化物。
-
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
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。
-
公开(公告)号：US4061727A
公开(公告)日：1977-12-06
申请号：US732909
申请日：1976-10-15
申请人： Guenter Vaeth , Manfred Ohlinger , Heinz Stritzinger , Eduard Schoenafinger , Eugen Wettstein , Wolfgang Guth
发明人： Guenter Vaeth , Manfred Ohlinger , Heinz Stritzinger , Eduard Schoenafinger , Eugen Wettstein , Wolfgang Guth
CPC分类号： G11B5/70652 , C01G49/06 , C01P2004/10 , C01P2004/54 , C01P2004/62 , C01P2006/11 , C01P2006/12 , C01P2006/42
摘要： Acicular .gamma.-iron(III) oxide is manufactured by reacting an iron(II) salt solution with aqueous solutions of alkali metal hydroxides and oxidizing the resulting suspension of iron(II) hyroxides in 3 stages. In the first stage not more than 8 percent by weight of the iron(II) hydroxide originally present is oxidized over a period of 0.5 to 4 hours, in the second stage from 25 to 55 percent by weight over a period of 1.5 to 6 hours and the remainder thereof in a third stage. Following this oxidation, the goethite formed is reduced to magnetite, which is then oxidized to acicular .gamma.-iron(III) oxide.
摘要翻译： 通过使铁（II）盐溶液与碱金属氢氧化物水溶液反应制备针状γ-氧化铁（III），并将所得到的铁（II）氢氧化物悬浮液分三个阶段进行氧化。 在第一阶段，不超过8重量％的本身存在的（II）的氢氧化物在0.5至4小时的时间内被氧化，在第二阶段中，在1.5至6小时内氧化25至55重量％ 其余部分在第三阶段。 在这种氧化之后，形成的针铁矿被还原成磁铁矿，然后氧化成针状的γ-铁氧化物（III）。
-
公开(公告)号：US4109046A
公开(公告)日：1978-08-22
申请号：US747355
申请日：1976-12-03
申请人： Fritz Hammon , Manfred Ohlinger , Horst Grosselfinger , Heinz Stritzinger , Job-Werner Hartmann , Eduard Schoenafinger , Walter Schneider
发明人： Fritz Hammon , Manfred Ohlinger , Horst Grosselfinger , Heinz Stritzinger , Job-Werner Hartmann , Eduard Schoenafinger , Walter Schneider
CPC分类号： G11B5/70636 , Y10S428/90 , Y10T428/24975 , Y10T428/256 , Y10T428/265 , Y10T428/269
摘要： Flexible multi-layer magnetic recording media comprising a non-magnetic flexible base and, applied thereto, two superposed magnetizable layers which contain a homogeneous mixture of acicular magnetic chromium dioxide in an organic binder.According to the invention, the magnetizable layer adjacent to the base contains a chromium dioxide having a specific surface area, measured by the BET method, of from 15 to 25 m.sup.2 /g, while the outer magnetic layer contains a chromium dioxide having a specific surface area, measured by the BET method, of from 26 to 35 m.sup.2 /g.Such magnetic recording media are distinguished by uniformly high sensitivity over the entire audible frequency range even if close manufacturing tolerances are not maintained.
-
公开(公告)号：US4200678A
公开(公告)日：1980-04-29
申请号：US891541
申请日：1978-03-30
申请人： Philipp Pister , Franz Buettner , Fritz Hammon , Manfred Ohlinger , Heinz Stritzinger , Job-Werner Hartmann , Walter Schneider
发明人： Philipp Pister , Franz Buettner , Fritz Hammon , Manfred Ohlinger , Heinz Stritzinger , Job-Werner Hartmann , Walter Schneider
CPC分类号： G11B5/716 , Y10S428/90 , Y10T428/257
摘要： A flexible multilayer magnetic recording medium exhibiting an improved signal-to-print-through ratio coupled with an improved maximum output level and diminished dc noise, comprising a non-magnetic base and, applied thereto, at least two superposed layers consisting of a binder with magnetizable particles uniformly dispersed therein, the upper magnetic layer containing a magnetic pigment giving a signal-to-print-through ratio of less than 55db and the lower magnetic layer(s) containing a magnetic pigment giving a signal-to-print-through ratio of 55 db or more.
摘要翻译： 一种柔性多层磁记录介质，其具有改善的信号与打印比，并且具有改善的最大输出电平和减小的直流噪声，包括非磁性基底，并施加至少两个由粘合剂组成的叠加层， 可磁化颗粒均匀地分散在其中，上部磁性层含有磁性颜料，其信号与打印通过率小于55db，下部磁性层含有磁性颜料，给出信号与打印通过率 为55db以上。
-
6.发明授权
公开(公告)号：US4084936A
公开(公告)日：1978-04-18
申请号：US702980
申请日：1976-07-06
IPC分类号： C01G37/00 , B01J19/02 , C01G37/027 , C23F11/04 , C23F11/18
CPC分类号： B01J19/02
摘要： In order to reduce corrosion of the inside walls of a reactor made of iron or an iron alloy and used for the synthesis of chromium dioxide by hydrothermal conversion of chromium(VI) oxide with chromium oxides of lower valency, lead or bismuth is added at those points of the reactor at which an aqueous phase occurs during conversion and which do not contact the chromium oxides to be converted. The lead or bismuth may be used in metallic form or in the form of their oxides, hydroxides or salts.
摘要翻译： 为了减少由铁或铁合金制成的反应器的内壁的腐蚀，用于通过水合氧化铬（VI）氧化铬与低价铬氧化物合成二氧化铬，铅或铋被添加到那些 在转化期间发生水相并且不与待转化的铬氧化物接触的反应器的点。 铅或铋可以以金属形式或其氧化物，氢氧化物或盐的形式使用。
-
公开(公告)号：US3996407A
公开(公告)日：1976-12-07
申请号：US533973
申请日：1974-12-18
申请人： Egon Von Gross , Heinz Stritzinger , Job-Werner Hartmann , Manfred Steuerwald , Ursula Klein , Dieter Schaefer
发明人： Egon Von Gross , Heinz Stritzinger , Job-Werner Hartmann , Manfred Steuerwald , Ursula Klein , Dieter Schaefer
CPC分类号： G11B5/7023 , Y10T428/25 , Y10T428/257 , Y10T428/31663 , Y10T428/31667
摘要： Magnetic recording media comprising a non-magnetizable flexible base and a firmly adhering magnetic coating based on a dispersion, containing a silane, of a magnetic pigment in a polymeric binder, and a process for their manufacture. The silane is an aminoalkylsilane R.sub.n Si(OR').sub.4-n, wherein n is 1, 2 or 3, R' is alkyl of 1 to 8 carbon atoms and R is aminoalkyl of the formula with one or more primary and/or secondary amino groups and from 3 to 11 carbon atoms. Magnetic recording media comprising a magnetic coating containing such a silane exhibit better abrasion resistance and better electromagnetic properties than comparable coatings.
摘要翻译： 磁性记录介质包括不可磁化的柔性基底和基于包含硅烷的分散体的牢固粘附的磁性涂层，所述分散体包含聚合物粘合剂中的磁性颜料及其制造方法。 硅烷是氨基烷基硅烷RnSi（OR'）4-n，其中n是1,2或3，R'是1至8个碳原子的烷基，R是具有一个或多个伯和/或仲氨基的氨基烷基 基团和3至11个碳原子。 包含含有这种硅烷的磁性涂层的磁记录介质比同类涂层表现出更好的耐磨性和更好的电磁特性。
-
-
-
-
-
-
搜索结果
7 条记录 (耗时 0.022 秒)
