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公开(公告)号：US3959553A
公开(公告)日：1976-05-25
申请号：US414331
申请日：1973-11-09
CPC分类号： G11B5/7085 , Y10S428/90 , Y10T428/257 , Y10T428/2982 , Y10T428/31529
摘要： The invention relates to magnetic discs in which first a non-magnetic intermediate layer and then the magnetic coating are applied by conventional methods to an aluminum disc. The intermediate layer applied to the non-magnetic metallic carrier disc is a hard non-magnetic coating which can be polished and which consists of a dispersion of a pulverulent mixture of finely divided inorganic non-magnetic pigments having a Mohs' hardness of at least 7 in a binder which can be cured and which provides firm cohesion of the pigment particles and good adhesion thereof to the non-magnetic base disc, the pigment mixture containing at least 3 percent by weight of corundum powder having a particle size of from about 1 to 20.mu.u. Magnetic discs with very thin magnetic coatings which possess good magnetic and mechanical properties and whose thickness varies only minimally are thus produced in a simple manner.
摘要翻译： 本发明涉及磁盘，其中首先将非磁性中间层然后通过常规方法将磁性涂层施加到铝盘上。 施加到非磁性金属载体盘的中间层是可以抛光的硬质非磁性涂层，其由具有莫氏硬度至少为7的细分的无机非磁性颜料的粉末混合物的分散体组成 在可固化的粘合剂中，其提供颜料颗粒的牢固粘合和对非磁性基盘的良好粘附性，所述颜料混合物含有至少3重量％的刚玉粉末，其具有约1至 20亩 因此，以简单的方式制造具有良好磁性和机械性能并且其厚度仅最小程度变化的非常薄的磁性涂层的磁盘。
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公开(公告)号：US4000336A
公开(公告)日：1976-12-28
申请号：US521476
申请日：1974-11-06
CPC分类号： G11B5/7021 , Y10S428/90
摘要： In a process for the production of magnetic recording media by applying a layer of a dispersion of a magnetic pigment in a polyurethane-containing binder and a solvent to non-magnetic supports, small amounts of ethylenically unsaturated polymerizable carboxylic acids or their anhydrides with or without copolymerizable monomers are added and polymerized during dispersion of the magnetic pigment. Recording media produced by this process exhibit excellent output level, coefficient of friction and electrical resistance values and have particularly good operational durability.
摘要翻译： 在通过将磁性颜料的分散体在含聚氨酯的粘合剂和溶剂中的一层施加到非磁性载体上来制造磁记录介质的方法中，少量的烯属不饱和可聚合羧酸或其酸酐具有或不具有 可共聚单体在磁性颜料的分散过程中加入并聚合。 通过该方法生产的记录介质表现出优异的输出水平，摩擦系数和电阻值，并且具有特别好的操作耐久性。
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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
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。
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