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    • 2. 发明授权
    • Magnetic recording discs
    • 磁记录盘
    • US4046932A
    • 1977-09-06
    • US656182
    • 1976-02-09
    • Hans-Joerg HartmannRoland FalkPeter GawlikWerner BalzKarl UhlDieter SchaeferHerbert Motz
    • Hans-Joerg HartmannRoland FalkPeter GawlikWerner BalzKarl UhlDieter SchaeferHerbert Motz
    • G11B5/702H01F10/02
    • G11B5/7023Y10S428/90Y10T428/254Y10T428/257Y10T428/269Y10T428/31529
    • The invention relates to a process for the manufacture of improved magnetic discs by applying a thin layer of a liquid dispersion of magnetic pigments and optionally further, non-magnetic, pigments in a binder mixture to a non-magnetic rigid base, and curing the magnetic coating which has been applied. The binder used is a mixture of polycondensates comprising 60 to 70% by weight of a solid curable polycondensate of 2,2-bis(4-hydroxyphenyl)-propane and epichlorohydrin having an epoxy equivalent weight from about 400 to 2,500 and a melting point from about 50.degree. to 150.degree. C, 10 to 30% by weight of a curable allyloxybenzene-formaldehyde condensate of the resol type with free methylol groups or with methylol groups etherified with a lower alcohol, and having a molecular weight of less than 1,000, and 10 to 30% by weight of a curable melamine-formaldehyde condensate with more than two methylol groups etherified with n-butanol or iso-butanol, and having a molecular weight of less than 2,500. A magnetic dispersion using such a binder allows the application of a firmly adhering magnetic coating, even in thicknesses of less than 4 .mu., to aluminum discs or pre-coated aluminum discs, and the magnetic coating produced has high resistance to mechanical wear.
    • 本发明涉及通过将粘性混合物中的磁性颜料和任选的另外的非磁性颜料的液体分散体的薄层施加到非磁性刚性基底上来制造改进的磁盘的方法,以及固化磁性 已涂覆的涂层。 使用的粘合剂是包含60至70重量%的环氧当量为约400至2,500的2,2-双(4-羟基苯基) - 丙烷和表氯醇的固体可固化缩聚物的缩聚物混合物,熔点为 约50〜150℃,10〜30重量%的甲阶型固化性烯丙氧基苯 - 甲醛缩合物与游离羟甲基或与低级醇醚化的羟甲基,分子量小于1,000,以及 10至30重量%的可固化的三聚氰胺 - 甲醛缩合物,其具有用正丁醇或异丁醇醚化的两个以上羟甲基,分子量小于2500。 使用这种粘合剂的磁性分散体允许对铝盘或预涂铝盘施加甚至厚度小于4微米的牢固粘附的磁性涂层,并且所产生的磁性涂层具有高的耐机械磨损性。