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    Magnetic recording medium
    1.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4886703A

    公开(公告)日：1989-12-12

    申请号：US183105

    申请日：1988-04-19

    申请人： Kazuo Hasumi ,  Hideomi Watanabe ,  Tsutomu Okita ,  Katsumi Ryoke ,  Hideaki Kosha

    发明人： Kazuo Hasumi ,  Hideomi Watanabe ,  Tsutomu Okita ,  Katsumi Ryoke ,  Hideaki Kosha

    IPC分类号： G11B5/702 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/64 ,  G11B5/73 ,  G11B5/735

    CPC分类号： G11B5/735 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/257 ,  Y10T428/265 ,  Y10T428/30

    摘要： A magnetic recording medium comprising a support having provided on one surface thereof a magnetic layer comprising a binder and ferromagnetic particles dispersed therein, and on the opposite surface thereof a backing layer comprising a binder and non-magnetic particles dispersed therein, wherein at least one of the binders comprises a vinyl chloride copolymer resin having a vinyl chloride unit content of about 70 wt % or more based on the total amount of the binder, a nitrogen content of about from 0.01 to 1 wt % based on the total amount of the binder, and a polymerization degree of about from 250 to 700; and the non-magnetic particles comprises fine carbon particles having a DBP oil absorption of about 150 ml/100 g or more.

    摘要翻译： 一种磁记录介质，包括在其一个表面上设置有包含粘合剂和分散在其中的铁磁性颗粒的磁性层的支撑体，并且在其相对表面上具有包含粘合剂和分散在其中的非磁性颗粒的背衬层，其中至少一个 粘合剂包含基于粘合剂总量为约70重量％以上的氯乙烯单元含量的氯乙烯共聚物树脂，相对于粘合剂的总量，氮含量为约0.01〜1重量％ 聚合度约为250〜700; 非磁性粒子包含DBP吸油量为150ml / 100g以上的细小碳粒子。

    Process for producing a magnetic recording medium
    2.
    发明授权
    Process for producing a magnetic recording medium 失效
    磁记录介质的制造方法

    公开(公告)号：US5045351A

    公开(公告)日：1991-09-03

    申请号：US423290

    申请日：1989-10-18

    申请人： Tsutomu Okita ,  Yasuo Nishikawa ,  Hiroshi Hashimoto ,  Hideomi Watanabe

    发明人： Tsutomu Okita ,  Yasuo Nishikawa ,  Hiroshi Hashimoto ,  Hideomi Watanabe

    IPC分类号： G11B5/702

    CPC分类号： G11B5/7022

    摘要： A process for producing a magnetic recording medium which comprises a step of kneading a ferromagnetic powder with a binder in the presence of a solvent, a step of dispersing the resulting blend with the binder and/or solvent, and a step of coating the resulting magnetic coating composition on a nonmagnetic support followed by drying;Wherein said step of kneading is carried out by kneading a ferromagnetic powder having a particle size of not more than 350 .ANG. with a glycidyl compound and a binder comprising at least a vinyl chloride copolymer having an OH- terminated side chain bonded via an organic group and also having a polar group and/or a solvent; said binder, polyurethane resin, and solvent being used in a total amount of from 40 to 70 parts by weight per 100 parts by weight of said ferromagnetic powder; and wherein said step of dispersing is carried out in the presence of additional polyurethane resin having a polar group and/or solvent.

    摘要翻译： 一种制造磁记录介质的方法，包括在溶剂存在下将铁磁性粉末与粘合剂混合的步骤，用粘合剂和/或溶剂分散所得共混物的步骤，以及涂覆所得磁性 涂覆组合物在非磁性载体上，然后干燥; 其中所述捏合步骤是通过将具有不超过350埃格姆的粒度的铁磁性粉末与缩水甘油基化合物和包含至少一种具有通过有机基团键合有OH-封端的侧链的氯乙烯共聚物的粘合剂进行的，以及 也具有极性基团和/或溶剂; 所述粘合剂，聚氨酯树脂和溶剂的使用总量为每100重量份所述铁磁粉末为40至70重量份; 并且其中所述分散步骤在具有极性基团和/或溶剂的另外的聚氨酯树脂的存在下进行。

    Magnetic recording medium having ferromagnetic powder, a binder containing a specified vinyl chloride copolymer, polar group containing polyurethane resin and a fatty acid amide
    3.
    发明授权
    Magnetic recording medium having ferromagnetic powder, a binder containing a specified vinyl chloride copolymer, polar group containing polyurethane resin and a fatty acid amide 失效
    具有铁磁粉末的磁记录介质，含有特定氯乙烯共聚物的粘合剂，含极性基团的聚氨酯树脂和脂肪酸酰胺

    公开(公告)号：US5258231A

    公开(公告)日：1993-11-02

    申请号：US908916

    申请日：1992-07-02

    申请人： Tsutomu Okita ,  Yasuo Nishikawa ,  Hiroshi Hashimoto ,  Hideomi Watanabe

    发明人： Tsutomu Okita ,  Yasuo Nishikawa ,  Hiroshi Hashimoto ,  Hideomi Watanabe

    IPC分类号： G11B5/702 ,  G11B5/00

    CPC分类号： G11B5/7022 ,  Y10S428/90 ,  Y10T428/31609 ,  Y10T428/31935

    摘要： A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer comprising a ferromagnetic powder and a binder material, wherein the magnetic layer contains at least a vinyl chloride copolymer binder having at least one polar group selected from --SO.sub.3 M and --COOM, wherein M represents a hydrogen atom, an alkali metal, or an ammonium ion, and at least one epoxy group per molecule in an amount of 1.times.10.sup.-4 to 1.times.10.sup.-2 per gram, and a fatty acid amide having from 12 to 26 atoms and present in an amount of from 0.05 to 2 wt % based on the amount of the ferromagnetic powder, and wherein the content of the polar group in the vinyl chloride copolymer binder is from about 1.times.10.sup.-7 to 1.times.10.sup.-3 equivalent per gram, and wherein the vinyl chloride copolymer binder has a weight average molecular weight of from 20,000 to 100,000 and wherein the magnetic layer further contains a polyurethane resin having a polar group.

    摘要翻译： 一种磁记录介质，包括非磁性载体，其上设置有包含铁磁性粉末和粘合剂材料的磁性层，其中所述磁性层至少含有具有至少一个选自-SO 3 M和-COOM的极性基团的氯乙烯共聚物粘合剂 ，其中M表示氢原子，碱金属或铵离子，每分子中至少一个环氧基团的量为1×10 -4至1×10 -2 /克，具有12至26个原子的脂肪酸酰胺 并且以铁磁粉末的量计为0.05-2重量％，其中氯乙烯共聚物粘合剂中极性基团的含量为每克约1×10-7至1×10-3当量， 其中所述氯乙烯共聚物粘合剂的重均分子量为20,000至100,000，并且其中所述磁性层还含有具有极性基团的聚氨酯树脂。

    Magnetic recording medium containing magnetic particles surface treated with a glycidyl compound
    5.
    发明授权
    Magnetic recording medium containing magnetic particles surface treated with a glycidyl compound 失效
    含有用缩水甘油基化合物表面处理的磁性颗粒的磁记录介质

    公开(公告)号：US5082733A

    公开(公告)日：1992-01-21

    申请号：US340617

    申请日：1989-04-18

    申请人： Hideomi Watanabe ,  Mikio Ohno ,  Hiroshi Hashimoto ,  Tsutomu Okita

    发明人： Hideomi Watanabe ,  Mikio Ohno ,  Hiroshi Hashimoto ,  Tsutomu Okita

    IPC分类号： G11B5/842 ,  G11B5/712

    CPC分类号： G11B5/712 ,  Y10S428/90 ,  Y10T428/2991 ,  Y10T428/2998

    摘要： A method for preparing a magnetic recording medium is disclosed, comprising the steps of (1) surface-treating ferromagnetic particles with a glycidyl compound having a molecular weight of 1,000 or less and having an epoxy equivalent of 200 g/eq. or less, (2) dispersing the surface-treated ferromagnetic particles with a binder to prepare a magnetic coating composition, (3) coating the resulting magnetic coating composition on a nonmagnetic support, and then (4) drying the magnetic coating composition.

    摘要翻译： 公开了一种制备磁记录介质的方法，包括以下步骤：（1）用分子量为1,000或更小的环氧当量为200g / eq的缩水甘油基化合物对铁磁颗粒进行表面处理。 （2）用粘合剂分散表面处理的铁磁颗粒以制备磁性涂料组合物，（3）将所得磁性涂料组合物涂布在非磁性载体上，然后（4）干燥磁性涂料组合物。

    Magnetic recording medium having a cobalt thin film magnetic layer, carbon protective layer, and fluorolubricant layer
    9.
    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。

    Magnetic recording medium having a lubricant layer of a fluoroalkyl sulfo-compound
    10.
    发明授权
    Magnetic recording medium having a lubricant layer of a fluoroalkyl sulfo-compound 失效
    具有氟烷基磺基化合物润滑层的磁记录介质

    公开(公告)号：US5395696A

    公开(公告)日：1995-03-07

    申请号：US44505

    申请日：1993-04-09

    申请人： Toshio Ishida ,  Hideomi Watanabe ,  Tsutomu Okita ,  Kunihiko Honda ,  Kazuyuki Usuki

    发明人： Toshio Ishida ,  Hideomi Watanabe ,  Tsutomu Okita ,  Kunihiko Honda ,  Kazuyuki Usuki

    IPC分类号： G11B5/71 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/06 ,  C09D201/00 ,  C10M105/72 ,  C10M135/10 ,  C10N10/02 ,  C10N10/04 ,  C10N40/18 ,  G11B5/64 ,  G11B5/725 ,  G11B5/73 ,  G11B5/00

    CPC分类号： G11B5/725 ,  Y10S428/90 ,  Y10T428/30 ,  Y10T428/3154 ,  Y10T428/31678 ,  Y10T428/31692

    摘要： A magnetic recording medium having a magnetic recording layer on at least one surface of a non-magnetic support, wherein the magnetic recording layer has thereon a lubricant layer containing at least one fluoroalkyl sulfo compound having an ether or ester linkage, which is represented by the following formula (1). The magnetic recording medium is free from corrosion of the magnetic recording layer and has a low coefficient of friction and excellent running durability and shelf stability. The lubricant layer is particularly suitable for a magnetic recording medium having a metal thin film with or without an inorganic protective film as a magnetic recording layer.(Rf--A--R--SO.sub.3).sub.k X Formula (1)wherein Rf represents a fluoroalkyl group or a perfluoroalkyl group; A represents ##STR1## R represents an alkylene group; k represents an integer of 1 or 2; and X represents --H, --M, --MH (wherein M is an alkali metal or an alkali earth metal), or any one of primary to quaternary ammoniums.

    摘要翻译： 一种在非磁性载体的至少一个表面上具有磁记录层的磁记录介质，其中所述磁记录层上具有含有至少一个具有醚或酯键的氟代烷基磺基化合物的润滑剂层， 以下公式（1）。 磁记录介质没有磁记录层的腐蚀，并且具有低的摩擦系数和优良的运行耐久性和架子稳定性。 润滑剂层特别适用于具有或不具有无机保护膜作为磁记录层的金属薄膜的磁记录介质。 （Rf-A-R-SO 3）kXFormula（1）其中Rf表示氟代烷基或全氟烷基; A表示 R表示亚烷基; k表示1或2的整数; 和X表示-H，-M，-MH（其中M是碱金属或碱土金属）或任何一种至季铵。