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    • 1. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US4511629A
    • 1985-04-16
    • US463419
    • 1983-02-03
    • Ryozo KonnoMakio SugaiYuichi KubotaMasaharu NishimatsuYukihiro IsobeKazushi TanakaOsamu Shinoura
    • Ryozo KonnoMakio SugaiYuichi KubotaMasaharu NishimatsuYukihiro IsobeKazushi TanakaOsamu Shinoura
    • C09D5/23G11B5/738H01F10/00B05D5/12
    • G11B5/738Y10S428/90Y10T428/31935
    • In a magnetic recording medium made by applying a non-magnetic undercoat and a magnetic top coat on a base, the undercoat comprises a radiation-curable coating material which contains a compound with a molecular weight of not less than 400, having one type of double bond selected from among acrylic, allylic, and maleic double bonds, the undercoat being formed by exposure to radiation. Specifically, the undercoating material contains at least two types of compounds selected from (A) those having a molecular weight of over 5000, preferably over 8000 and having two or more double bonds selected as above, (B) those having a molecular weight of 400 or more but less than 500, preferably in the range of 600 to 3000, and two or more double bonds selected as above, and (C) those having a molecular weight of less than 400 and one or more double bonds selected from among acrylic, allylic, maleic, and styrenic double bonds. At least two types of the compounds are used in a mixing ratio of 0-90 wt % (A), 0-80 wt % (B), and 0-50 wt % wt % (C).
    • 在通过在基底上施加非磁性底涂层和磁性面漆制成的磁记录介质中,底涂层包含含有分子量不小于400的化合物的辐射固化涂层材料,具有一种类型的双 键从丙烯酸,烯丙基和马来双键中选择,底涂层通过暴露于辐射形成。 具体地说,底涂层材料含有至少两种选自(A)分子量超过5000,优选超过8000,具有两个以上选自上述双键的化合物,(B)分子量为400 或更多但小于500,优选在600至3000的范围内,以及如上选择的两个或更多个双键,和(C)分子量小于400的那些和选自丙烯酸, 烯丙基,马来酸和苯乙烯双键。 以0-90重量%(A),0-80重量%(B)和0-50重量%重量(C)的混合比使用至少两种类型的化合物。
    • 5. 发明授权
    • Magnetic recording medium and method
    • 磁记录介质及方法
    • US4451531A
    • 1984-05-29
    • US384063
    • 1982-06-01
    • Yukihiro IsobeKazushi TanakaMasaharu NishimatsuOsamu ShinouraYuichi Kubota
    • Yukihiro IsobeKazushi TanakaMasaharu NishimatsuOsamu ShinouraYuichi Kubota
    • C09D167/07G11B5/708G11B5/73G11B5/735B32B5/16
    • G11B5/7085Y10S428/90Y10T428/252Y10T428/256Y10T428/257Y10T428/266
    • The invention provides a novel magnetic recording tape comprising a film base, a magnetic coating layer on one surface and a backing layer on the other surface, the backing layer containing an abrasive powder having a hardness of at least 4 in the Mohs scale, such as silicon carbide and the like, dispersed in a binder matrix formed by curing a radiation-sensitive polymer by irradiating with a high energy radiation, such as electron beams accelerated at a voltage of 100 to 750 kilovolts. Coating of the film base with a coating composition to form the backing layer is performed on the surface of the film base having been provided with the magnetic coating layer on the other surface and the radiation-curing of the backing layer is performed prior to winding the tape into a roll to give a specified tensile modulus so that the magnetic recording tape is freed from the problem of the phenomenon of dropout owing to the absence of any particulate material adhering to the tape surface as is sometimes unavoidable in the conventional manufacturing process. The product tape is also quite free from scratch formation by virtue of the presence of the abrasive powder in the backing layer also contributing to the decrease of dropout.
    • 本发明提供了一种新颖的磁记录带,其包括膜基底,一个表面上的磁性涂层和另一个表面上的背衬层,该背衬层含有摩尔规格中硬度至少为4的磨料粉末,例如 碳化硅等分散在通过用高能辐射照射固化辐射敏感聚合物形成的粘合剂基质中,例如以100-750千伏的电压加速的电子束。 在具有在另一表面上设置有磁性涂层的膜基材的表面上进行用涂料组合物涂覆膜基底以形成背衬层,并且背衬层的辐射固化在卷绕之前进行 将其卷成卷以提供特定的拉伸模量,使得磁记录带由于没有任何颗粒材料粘附到带表面而免除掉落现象的问题,这在常规制造过程中有时是不可避免的。 由于在背衬层中存在磨料粉末,产品胶带也非常没有刮擦形成,也有助于减少脱落。