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    • 1. 发明授权
    • Process for producing magnetic recording medium
    • 磁记录介质的制造方法
    • US4724162A
    • 1988-02-09
    • US39878
    • 1987-04-20
    • Shinji SaitoHiroshi OgawaChiaki MizunoToshio OnoYasuo Tamai
    • Shinji SaitoHiroshi OgawaChiaki MizunoToshio OnoYasuo Tamai
    • B01F3/12G11B5/702G11B5/842H01F10/02
    • G11B5/842G11B5/7028
    • An improvement of a process for producing a magnetic recording medium comprising coating a non-magnetic support with a magnetic paint comprising a magnetic layer forming component containing ferromagnetic powder and a resin component dispersed in an organic solvent and drying the coated layer. The improvement resides in the preparation of the magnetic paint. In the improvement, the magnetic paint is obtained by kneading said magnetic layer forming component and a first solvent having a solubility parameter of not lower than 9.5[cal..multidot.cm.sup.-3 ].sup.1/2 as measured by Small method and adding a second solvent to the resulting kneaded product so that the mixed organic solvent in the magnetic paint has a solubility parameter of lower than 9.5[cal.multidot.cm.sup.-3 ].sup.1/2 to thereby disperse the magnetic layer forming component in the organic solvent.
    • 一种制造磁记录介质的方法的改进,包括用包含含有铁磁粉末的磁性层形成组分和分散在有机溶剂中的树脂组分的磁性涂料涂覆非磁性载体并干燥涂层。 改进在于磁性涂料的制备。 在此改进中,磁性涂料是通过将所述磁性层形成组分和溶解度参数不低于9.5 [cal.xcm-3] 1/2的第一种溶剂进行捏合而获得的,通过Small法测量,并将第二溶剂加入到 得到的混炼物,使得磁性涂料中的混合有机溶剂的溶解度参数低于9.5 [calxcm-3] 1/2,从而将磁性层形成组分分散在有机溶剂中。
    • 9. 发明授权
    • Method for preparing magnetic coating compositions
    • 磁性涂料组合物的制备方法
    • US4952064A
    • 1990-08-28
    • US459174
    • 1989-12-29
    • Toshio OnoChiaki MizunoYasuo TamaiHiroshi Ogawa
    • Toshio OnoChiaki MizunoYasuo TamaiHiroshi Ogawa
    • B01F3/12
    • B01F3/1207
    • A single two-shaft continuous kneading and mixing machine, which is provided with a pair of shafts having blade members secured thereto, and a barrel accommodating the shafts such that they can be rotated, carries out kneading of a mixture of magnetic grains and a solution, which contains a binder in an organic solvent, in a normal kneading region and thereafter carries out dilution kneading of the mixture, which resulted after kneading in the normal kneading region was carried out, and an organic solvent in a dilution kneading region. The solids concentration in the mixture subjected to kneading in the normal kneading region is adjusted so that it falls within the range of 65 to 95 wt %. The solids concentration in the mixture subjected to dilution kneading is adjusted so that it falls within the range of 30 to 60 wt %. The width of a gap between blade members, which are secured to different shafts and which face each other, and the width of a gap between each blade member and the inner surface of the barrel in the dilution kneading region are made smaller than the widths of corresponding gaps in the normal kneading region.
    • 具有固定有刀片部件的一对轴的单个双轴连续捏和混合机和容纳轴的滚筒使其能够转动,进行磁性粒子和溶液的混合的捏合 在正常捏合区域中含有有机溶剂中的粘合剂,然后进行在正常混炼区域​​中捏合后混合物的稀释混炼和稀释混炼区域中的有机溶剂。 调整在正常捏合区域中进行捏合的混合物中的固体浓度,使其在65〜95重量%的范围内。 调整进行稀释混炼的混合物中的固体浓度,使其在30〜60重量%的范围内。 固定在不同轴上并且彼此面对的叶片构件之间的间隙的宽度以及稀释混合区域中的每个叶片构件和筒的内表面之间的间隙的宽度被制成小于 正常捏合区域中的相应间隙。