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    Magnetic recording medium
    72.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4812351A

    公开(公告)日：1989-03-14

    申请号：US191804

    申请日：1988-05-03

    申请人： Tsutomu Okita ,  Masashi Aonuma ,  Hiroshi Hashimoto

    发明人： Tsutomu Okita ,  Masashi Aonuma ,  Hiroshi Hashimoto

    IPC分类号： G11B5/735 ,  G11B5/70

    CPC分类号： G11B5/735 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/265

    摘要： A magnetic recording medium is described, comprising a non-magnetic support having a surface roughness of 0.02 .mu.m or less, a magnetic layer on the surface of the support and a backing layer on a surface of the support opposite to the surface on which the magnetic layer is formed, wherein the backing layer is formed by exposing to radiation a layer comprising (A) non-magnetic particles and (B) a radiation polymerizable compound.

    摘要翻译： 描述了一种磁记录介质，其包括具有0.02μm或更小的表面粗糙度的非磁性支撑体，支撑体表面上的磁性层和与表面相反的表面的表面上的背衬层， 形成磁性层，其中通过将包含（A）非磁性颗粒和（B）可辐射聚合化合物的层暴露于辐射而形成背衬层。

    Magnetic recording medium and process for producing the same
    75.
    发明授权
    Magnetic recording medium and process for producing the same 失效
    磁记录介质及其制造方法

    公开(公告)号：US4518656A

    公开(公告)日：1985-05-21

    申请号：US537552

    申请日：1983-10-03

    申请人： Tsutomu Okita ,  Kyoichi Naruo

    发明人： Tsutomu Okita ,  Kyoichi Naruo

    IPC分类号： C09D5/23 ,  G11B5/70 ,  G11B5/702 ,  G11B5/84 ,  G11B5/842

    CPC分类号： G11B5/7025 ,  G11B5/842 ,  Y10S428/90 ,  Y10T428/2991 ,  Y10T428/31935 ,  Y10T428/31975

    摘要： A magnetic recording medium and a process for producing a magnetic recording medium are disclosed, the process comprising the steps of applying onto a non-magnetic base a composition comprising (1) a compound having an unsaturated bond polymerizable by electron beams, (2) at least one polymer, (3) ferromagnetic particles, and (4) an organic solvent, and then polymerizing and curing the resulting magnetic layer by irradiation with electron beams, said polymer being such that at least 10% thereof is adsorbed on the ferromagnetic particles in a mixture of 10 parts by weight of a 1 wt % solution of the polymer and 1 part by weight of the ferromagnetic particles.

    摘要翻译： 公开了磁记录介质和制造磁记录介质的方法，该方法包括以下步骤：向非磁性基底施加组合物，该组合物包含（1）具有通过电子束聚合的不饱和键的化合物，（2）在 至少一种聚合物，（3）铁磁颗粒和（4）有机溶剂，然后通过用电子束照射聚合和固化所得到的磁性层，所述聚合物使其至少10％被吸附在铁磁颗粒上 10重量份的1重量％的聚合物溶液和1重量份的铁磁性颗粒的混合物。

    Magnetic recording material
    76.
    发明授权
    Magnetic recording material 失效
    磁记录材料

    公开(公告)号：US4468436A

    公开(公告)日：1984-08-28

    申请号：US452555

    申请日：1982-12-23

    申请人： Tsutomu Okita ,  Kiritani Masataka

    发明人： Tsutomu Okita ,  Kiritani Masataka

    IPC分类号： G11B5/738 ,  B05D3/06

    CPC分类号： G11B5/738 ,  Y10S428/90 ,  Y10T428/31554 ,  Y10T428/31609 ,  Y10T428/31928

    摘要： A magnetic recording material and a process for producing it are disclosed. The material is excellent in abrasion resistance and has good electric characteristics. The material is obtained by coating on a support a subbing layer having a compound which contains a compound having an unsaturated bond polymerizable upon irradiation with electron beams. Upon the subbing layer is coated a ferromagnetic layer which contains a compound having an unsaturated bond polymerizable upon irradiation with electron beams, an organic solvent capable of dissolving the compound, and a ferromagnetic fine powder. The material is then subjected to an electron-beam irradiating processing to result in the hardening of the subbing and ferromagnetic layers through polymerization.

    摘要翻译： 公开了磁记录材料及其制造方法。 该材料具有优异的耐磨性和良好的电特性。 该材料通过在载体上涂布具有含有具有在电子束照射下可聚合的不饱和键的化合物的化合物的底层而获得。 在底层涂覆铁氧体层时，该铁磁层含有在电子束照射下可聚合的具有不饱和键的化合物，可溶解该化合物的有机溶剂和铁磁性细粉末。 然后对该材料进行电子束照射处理，以通过聚合导致底层和铁磁性层的硬化。

    Process for producing magnetic recording material
    77.
    发明授权
    Process for producing magnetic recording material 失效
    磁记录材料的制造方法

    公开(公告)号：US4428974A

    公开(公告)日：1984-01-31

    申请号：US447597

    申请日：1982-12-07

    申请人： Tsutomu Okita ,  Kyoichi Naruo ,  Akira Ushimaru

    发明人： Tsutomu Okita ,  Kyoichi Naruo ,  Akira Ushimaru

    IPC分类号： G11B5/702 ,  B05D3/06 ,  C09D5/23 ,  C09D133/04 ,  C09D133/08 ,  C09D175/04 ,  G11B5/84 ,  G11B5/842

    CPC分类号： B05D3/068 ,  G11B5/84 ,  G11B5/842

    摘要： A process for producing a magnetic recording material having excellent electromagnetic characteristics and sufficient abrasion resistance is disclosed. The process comprises the steps of coating on a support a magnetic recording composition containing a compound having an unsaturated bond polymerizable by irradiation with electron beams, an organic solvent capable of dissolving the compound and a ferromagnetic powder. The compound is subjected in sequence to a coating process on a nonmagnetic support, irradiated with an electron beam in an atmosphere containing oxygen at a concentration of 10,000 ppm or more and subjected to a smoothening treatment utilizing a specular surface, followed by an electron beam irradiation in an atmosphere containing oxygen at a concentration of 3,000 ppm or less.

    摘要翻译： 公开了一种制造具有优异的电磁特性和足够耐磨性的磁记录材料的方法。 该方法包括以下步骤：在载体上涂覆含有通过电子束照射可聚合的具有不饱和键的化合物的磁记录组合物，能够溶解化合物的有机溶剂和铁磁性粉末。 将化合物依次涂覆在非磁性载体上，在含有浓度为10,000ppm以上的氧的气氛中用电子束照射，并使用镜面进行平滑化处理，然后进行电子束照射 在含有浓度为3,000ppm以下的氧的气氛中。

    Magnetic recording medium comprising ferromagnetic powder and a specified polyurethane resin
    78.
    发明授权
    Magnetic recording medium comprising ferromagnetic powder and a specified polyurethane resin 失效
    包含铁磁粉末和特定聚氨酯树脂的磁记录介质

    公开(公告)号：US5702821A

    公开(公告)日：1997-12-30

    申请号：US555447

    申请日：1995-11-09

    申请人： Yuichiro Murayama ,  Masaki Satake ,  Hiroshi Hashimoto ,  Tsutomu Okita

    发明人： Yuichiro Murayama ,  Masaki Satake ,  Hiroshi Hashimoto ,  Tsutomu Okita

    IPC分类号： C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702

    CPC分类号： G11B5/7021 ,  Y10S428/90 ,  Y10T428/31609

    摘要： In a binder for a magnetic recording medium for forming a magnetic layer with ferromagnetic powder dispersed therein being arranged on a non-magnetic support member, whereby said binder consists of a polyurethane resin, which is a reaction product of diol and organic diisocyanate as principal materials, said polyurethane resin contains a short-chain diol having cyclic structure by 17 to 40 weight %, and said polyurethane resin contains a long-chain diol comprising 1.0 to 5.0 mmol/g of ether group to total urethane resin by 10 to 50 weight %. According to a binder for a magnetic recording medium and a magnetic recording medium using said binder of the present invention, good dispersion property, high running durability and preservation property can be obtained.

    摘要翻译： 在用于形成其中分散有铁磁性粉末的磁性层的磁记录介质的粘合剂中，其布置在非磁性支撑构件上，由此所述粘合剂由作为主要材料的二醇和有机二异氰酸酯的反应产物的聚氨酯树脂 所述聚氨酯树脂含有具有17〜40重量％的环状结构的短链二醇，所述聚氨酯树脂含有长链二醇，其含有1.0〜5.0mmol / g的醚基与总聚氨酯树脂的比例为10〜50重量％ 。 根据本发明的磁记录介质用粘合剂和使用该粘合剂的磁记录介质，可以获得良好的分散性，高运行耐久性和保存性。

    Magnetic recording medium having a cobalt thin film magnetic layer, carbon protective layer, and fluorolubricant layer
    80.
    发明授权
    Magnetic recording medium having a cobalt thin film magnetic layer, carbon protective layer, and fluorolubricant layer 失效
    具有钴薄膜磁性层，碳保护层和氟润滑剂层的磁记录介质

    公开(公告)号：US5567524A

    公开(公告)日：1996-10-22

    申请号：US379931

    申请日：1995-01-27

    申请人： Toshio Ishida ,  Masaki Satake ,  Hideomi Watanabe ,  Tadashi Yasunaga ,  Tsutomu Okita

    发明人： Toshio Ishida ,  Masaki Satake ,  Hideomi Watanabe ,  Tadashi Yasunaga ,  Tsutomu Okita

    IPC分类号： G11B5/66 ,  C10M105/54 ,  C10N40/18 ,  G11B5/64 ,  G11B5/65 ,  G11B5/72 ,  G11B5/725 ,  G11B5/735

    CPC分类号： G11B5/725 ,  Y10S428/90 ,  Y10T428/30 ,  Y10T428/3154 ,  Y10T428/31678

    摘要： A magnetic recording medium having a ferromagnetic metal thin film formed over at least one surface of a non-magnetic support, wherein the improvement has a lubricant layer consisting essentially of at least one of unsaturated bond-containing fluoroalkyl carboxylic acid esters which are represented by the following formulae (1) to (3):Rf--R.sub.1 --COO--R.sup.2 Formula (1)R.sup.3 --COO--R.sub.4 --Rf Formula (2)Rf--R.sup.5 --COO--R.sup.6 Rf Formula (3)where Rf: (CF.sub.3).sub.a CF.sub.3-a (CF.sub.2).sub.ba: 1 to 3 a+b: 1 to 17R.sup.1 is an alkyl group having from 2 to 18 carbon atoms, or a hydrocarbon group having from 2 to 18 carbon atoms and containing at least one double or triple bond, and R.sup.2 is an alkyl group having from 4 to 22 carbon atoms, or a hydrocarbon group having from 4 to 22 carbon atoms and containing at least one double or triple bond. At least either one of R.sup.1 and R.sup.2 contains at least one double or triple bond. R.sup.3 is an alkyl group having from 3 to 21 carbon atoms, and R.sup.4 is a hydrocarbon group having from 4 to 18 carbon atoms and containing at least one double or triple bond. R.sup.5 and R.sup.6 are each an alkyl group having from 2 to 18 carbon atoms, or a hydrocarbon group having from 2 to 18 carbon atoms and containing at least one double or triple bond. At least either one of R.sup.5 and R.sup.6 contains at least one double or triple bond. R.sup.5 and R.sup.6 have from 20 to 44 carbon atoms in total.

    摘要翻译： 一种具有在非磁性载体的至少一个表面上形成的强磁性金属薄膜的磁记录介质，其中所述改进具有基本上由至少一种含不饱和键的氟烷基羧酸酯组成的润滑层，所述不饱和键的氟烷基羧酸酯由 （1）至（3）：Rf-R1-COO-R2（1）R3-COO-R4-Rf（2）Rf-R5-COO-R6RfFormula（3）其中Rf：（CF3）aCF3-a CF 2）ba：1〜3 a + b：1〜17 R 1为碳原子数2〜18的烷基或碳原子数为2〜18的含有至少一个双键或三键的烃基，R 2 是具有4至22个碳原子的烷基或具有4至22个碳原子并且含有至少一个双键或三键的烃基。 R1和R2中至少有一个含有至少一个双键或三键。 R3是具有3至21个碳原子的烷基，R4是具有4至18个碳原子并含有至少一个双键或三键的烃基。 R 5和R 6各自为具有2至18个碳原子的烷基或具有2至18个碳原子且含有至少一个双键或三键的烃基。 R5和R6中的至少一个含有至少一个双键或三键。 R5和R6总共具有20至44个碳原子。