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18 条记录 (耗时 0.023 秒)

    Magnetic recording medium having specific subbing layers and process for recovery and processing thereof
    4.
    发明授权
    Magnetic recording medium having specific subbing layers and process for recovery and processing thereof 失效
    具有特定底层的磁记录介质及其回收和处理方法

    公开(公告)号：US5368949A

    公开(公告)日：1994-11-29

    申请号：US759293

    申请日：1991-09-13

    申请人： Akira Ushimaru ,  Hiroshi Hashimoto ,  Kazuko Hanai ,  Keiichi Suzuki

    发明人： Akira Ushimaru ,  Hiroshi Hashimoto ,  Kazuko Hanai ,  Keiichi Suzuki

    IPC分类号： G11B5/84 ,  C08J11/06 ,  C09D5/00 ,  C09D5/23 ,  C09D175/06 ,  G11B5/702 ,  G11B5/73 ,  G11B5/735 ,  G11B5/738 ,  G11B5/66

    CPC分类号： G11B5/738 ,  C08J11/06 ,  Y02W30/701 ,  Y10S428/90

    摘要： A magnetic recording medium comprising a subbing layer provided between a nonmagnetic plastic support and at least one of a magnetic layer and a backing layer, the magnetic layer and the backing layer each having a void of 40% by volume or less, and the subbing layer having higher solubility in a 0.5 wt % alkaline aqueous solution at 40.degree. C. than that in water at 40.degree. C. and being soluble in a weak alkaline aqueous solution having an initial pH of less than 13 or a low concentration alkaline aqueous solution having 0.25N or less. The subbing layer comprising a polymer containing acidic polar groups, and the subbing layer being soluble in a weak alkaline aqueous solution having an initial pH of less than 13 or a low concentration alkaline aqueous solution having 0.25N or less. A process for recovery and processing of a magnetic recording medium, the process comprising the steps of: (1) cutting a magnetic recording medium comprising a nonmagnetic plastic support having thereon a magnetic layer and/or a backing layer each having a void of 40% by volume or less; (2) dipping pieces of the magnetic recording medium in a weak alkali having an initial pH of less than 13 or a low concentration alkaline aqueous solution having 0.25N or less with stirring so that a subbing layer in the pieces having higher solubility in an alkaline aqueous solution than that in water is dissolved therein to peel off the magnetic layer and/or the backing layer from the nonmagnetic plastic support, and (3) separating the magnetic layer and/or the backing layer from the nonmagnetic plastic support.

    摘要翻译： 一种磁记录介质，包括设置在非磁性塑料载体和磁性层和背衬层中的至少一个之间的底层，所述磁性层和背衬层各自具有40体积％或更小的空隙，并且所述底层 在40℃的0.5重量％碱性水溶液中的溶解度高于在40℃的水中的溶解度，并且可溶于初始pH小于13的弱碱性水溶液或具有低浓度碱性水溶液 0.25N以下。 所述底层包含含有酸性极性基团的聚合物，并且所述底层可溶于初始pH小于13的弱碱性水溶液或0.25N以下的低浓度碱性水溶液。 一种用于回收和处理磁记录介质的方法，该方法包括以下步骤：（1）切割磁记录介质，其包含非磁性塑料载体，其上具有磁性层和/或背衬层，每层具有40％的空隙， 体积以下; （2）在初始pH小于13的弱碱中浸渍磁记录介质片，或者在搅拌下将浓度为0.25N以下的低浓度碱性水溶液浸渍，使得在碱中具有较高溶解度的片中的底层 水溶液溶解在其中以从非磁性塑料载体剥离磁性层和/或背衬层，以及（3）将磁性层和/或背衬层与非磁性塑料载体分离。

    Magnetic recording medium comprising ferromagnetic particles having crystallite size of less than 450 angstroms and a specified polyurethane binder
    5.
    发明授权
    Magnetic recording medium comprising ferromagnetic particles having crystallite size of less than 450 angstroms and a specified polyurethane binder 失效
    包含微晶尺寸小于450埃的铁磁颗粒和特定聚氨酯粘合剂的磁记录介质

    公开(公告)号：US5254404A

    公开(公告)日：1993-10-19

    申请号：US884273

    申请日：1992-05-13

    申请人： Hiroshi Hashimoto ,  Akira Ushimaru

    发明人： Hiroshi Hashimoto ,  Akira Ushimaru

    IPC分类号： G11B5/702 ,  G11B5/00

    CPC分类号： G11B5/7021 ,  G11B5/7022 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/31609

    摘要： A magnetic recording medium is disclosed, comprising a non-magnetic support having thereon at least one magnetic recording layer comprising a dispersion of ferromagnetic particles in a binder, said binder comprising the combination of a polyisocyanate and a polyurethane binder comprising at least one terminal hydroxyl group at each end of the polyurethane molecule, said polyurethane binder being prepared by reacting (a) a polyurethane prepolymer comprising at least one terminal isocyanate group at each end of the polyurethane prepolymer molecule, said polyurethane prepolymer having a glass transition temperature of at least 0.degree. C. and containing a polar group, with (b) a compound comprising at least one terminal hydroxyl group at each end of the polymer molecule and having a glass transition temperature of -30.degree. C. or less.

    摘要翻译： 公开了一种磁记录介质，其包括其上具有至少一个包含铁磁颗粒在粘合剂中的分散体的磁记录层的非磁性载体，所述粘合剂包括多异氰酸酯和包含至少一个末端羟基的聚氨酯粘合剂的组合 在聚氨酯分子的两端，所述聚氨酯粘合剂通过使（a）在聚氨酯预聚物分子的每一端包含至少一个末端异氰酸酯基团的聚氨酯预聚物，所述聚氨酯预聚物的玻璃化转变温度至少为0℃ 并且含有极性基团，其中（b）在聚合物分子的每个末端具有至少一个末端羟基并且具有-30℃或更低的玻璃化转变温度的化合物。

    Magnetic recording medium comprising plural magnetic layers
    8.
    发明授权
    Magnetic recording medium comprising plural magnetic layers 失效
    包含多个磁性层的磁记录介质

    公开(公告)号：US5132179A

    公开(公告)日：1992-07-21

    申请号：US679394

    申请日：1991-04-02

    申请人： Hiroshi Hashimoto ,  Akira Ushimaru

    发明人： Hiroshi Hashimoto ,  Akira Ushimaru

    IPC分类号： G11B5/702 ,  B05D1/36 ,  B32B27/00 ,  B32B27/18 ,  B32B27/38 ,  B32B33/00 ,  C09D5/23 ,  C09D163/00 ,  C09D175/00 ,  C09D175/04 ,  G11B5/716

    CPC分类号： G11B5/716 ,  Y10S428/90 ,  Y10T428/2991 ,  Y10T428/2998 ,  Y10T428/31609

    摘要： A magnetic recording medium comprising a non-magnetic support having thereon plural magnetic layers comprising a fine ferromagnetic powder and a binder and which are composed of at least two magnetic layers. In preparing the medium, a first magnetic layer-coating composition containing an epoxy compound having at least two epoxy groups is coated on the nonmagnetic support and a second magnetic layer-coating composition containing a polyisocyanate compound is coated over the first magnetic layer with a simultaneous or successive multiple layered coating method. The medium has an excellent electromagnetic characteristic and yields few dropouts, and it is usable as a medium for high density recording.

    摘要翻译： 一种磁记录介质，包括一个非磁性载体，其上有多个包含细铁磁性粉末和粘合剂的磁性层，并由至少两个磁性层组成。 在制备介质时，将含有至少两个环氧基团的环氧化合物的第一磁性层涂料组合物涂覆在非磁性载体上，并且含有多异氰酸酯化合物的第二磁性层涂料组合物涂覆在第一磁性层上，同时 或连续多层涂布法。 该介质具有优异的电磁特性，并且产生较少的压差，并且可用作用于高密度记录的介质。