公开(公告)号：US4567108A

公开(公告)日：1986-01-28

申请号：US672635

申请日：1984-11-19

申请人： August Lehner ,  Helmut Kopke ,  Hermann Roller ,  Werner Balz ,  Werner Grau ,  Eberhard Koester ,  Friedrich Sommermann

发明人： August Lehner ,  Helmut Kopke ,  Hermann Roller ,  Werner Balz ,  Werner Grau ,  Eberhard Koester ,  Friedrich Sommermann

IPC分类号： C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/02 ,  C09D175/04 ,  G11B5/702 ,  G11B5/70

CPC分类号： G11B5/7022 ,  Y10S428/90 ,  Y10T428/31609 ,  Y10T428/31935 ,  Y10T428/31942

摘要： Magnetic recording media comprise a non-magnetic base which is provided with a magnetic layer consisting of finely divided anisotropic magnetic material which is dispersible in binders and additives, the binder being a mixture of (1) a high molecular weight thermoplastic linear polyurethane, (2) a polyvinylformal binder, a phenoxy resin, a cellulose ester or a vinyl chloride copolymer and (3) an OH-containing polyurethane which is crosslinked with polyisocyanates.

摘要翻译： 磁记录介质包括非磁性基底，该非磁性基底设置有由分散在粘合剂和添加剂中的细碎各向异性磁性材料组成的磁性层，该粘合剂是（1）高分子量热塑性线型聚氨酯（2） ）聚乙烯醇缩甲醛粘合剂，苯氧基树脂，纤维素酯或氯乙烯共聚物，和（3）与多异氰酸酯交联的含OH聚氨酯。

公开(公告)号：US4059716A

公开(公告)日：1977-11-22

申请号：US586346

申请日：1975-06-12

申请人： Helmut Kopke ,  Manfred Ohlinger ,  Werner Grau ,  Eduard Schoenafinger ,  Hans Henning Schneehage

发明人： Helmut Kopke ,  Manfred Ohlinger ,  Werner Grau ,  Eduard Schoenafinger ,  Hans Henning Schneehage

IPC分类号： C01G49/06 ,  G11B5/706 ,  H01F1/11 ,  H01F10/02

CPC分类号： G11B5/70663 ,  C01G49/06 ,  G11B5/70657 ,  C01P2004/03 ,  C01P2004/10 ,  C01P2006/10 ,  C01P2006/42 ,  Y10T428/2991

摘要： A process for the manufacture of acicular gamma-iron(III) oxide which, because of its improved dispersibility in organic binders, is suitable for the manufacture of magnetic recording media exhibiting a particularly high orientation ratio. For this purpose, the non-magnetic acicular .alpha.-iron(III) oxide or goethite pigment is treated with from 0.5 to 10% by weight, based on the pigment, of a compound of the formula I: ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are hydrogen, alkyl of 1 to 24 carbon atoms or alkenyl of 1 to 24 carbon atoms and (RX).sup.- is selected from the group consisting of an aliphatic carboxylic acid of 1 to 18 carbon atoms, an aromatic carboxylic acid of 1 to 18 carbon atoms, a sulfonic acid and an ester of phosphoric acid and is then further processed by conventional methods to give gamma-iron(III) oxide.

摘要翻译： 用于制造针状γ-氧化铁（III）的方法，其由于其在有机粘合剂中的分散性的改善而适用于制造表现出特别高取向比的磁记录介质。 为此，非磁性针状α-铁（III）氧化物或针铁矿颜料以基于颜料的0.5至10重量％的式I化合物处理：其中 R 1，R 2和R 3是氢，1至24个碳原子的烷基或1至24个碳原子的链烯基和（RX） - 选自1至18个碳原子的脂族羧酸，芳族羧酸 1至18个碳原子，磺酸和磷酸酯，然后通过常规方法进一步加工，得到γ-铁（III）氧化物。

公开(公告)号：US4005242A

公开(公告)日：1977-01-25

申请号：US536008

申请日：1974-12-23

申请人： Helmut Kopke ,  Hans-Joerg Hartmann ,  Dieter Mayer ,  Herbert Motz

发明人： Helmut Kopke ,  Hans-Joerg Hartmann ,  Dieter Mayer ,  Herbert Motz

IPC分类号： G11B5/708 ,  C08L83/12 ,  C08L101/00 ,  C09D5/23 ,  C09D7/12 ,  G11B5/71 ,  C08G77/42 ,  H01F1/26

CPC分类号： G11B5/71 ,  C08L101/00 ,  C08L83/12 ,  Y10S428/90 ,  Y10T428/31565 ,  Y10T428/3158 ,  Y10T428/31598 ,  Y10T428/31609 ,  Y10T428/31663

摘要： A magnetic recording medium consists of a non-magnetic base, on which the magnetic coating is a layer of a dispersion, containing a lubricant, of a magnetic pigment in a polymeric binder. The lubricant is a block copolymer which contains siloxane units and alkyleneoxy units of 2 to 4 carbon atoms, the alkyleneoxy units being bonded to the polysiloxane radical through a Si--O--C or Si--C group. The use of this lubricant gives a magnetic recording medium which has the advantages of good fluid lubrication and an excellent coefficient of friction which does not vary with time.

摘要翻译： 磁记录介质由非磁性基底组成，磁性涂层是含有润滑剂的分散体层，其中聚合物粘合剂中的磁性颜料。 润滑剂是含有硅氧烷单元和2〜4个碳原子的亚烷基氧基单元的嵌段共聚物，亚烷氧基单元通过Si-O-C或Si-C基团键合到聚硅氧烷基团上。 使用这种润滑剂产生磁记录介质，该介质具有良好的流体润滑性和优异的摩擦系数，并不随时间变化。