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    MAGNETIC RECORDING MEDIUM
    6.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH01162219A

    公开(公告)日：1989-06-26

    申请号：JP32087987

    申请日：1987-12-18

    申请人： VICTOR COMPANY OF JAPAN

    发明人： SUGAWARA JUNICHI ,  FUJIKI KUNIHARU

    IPC分类号： G11B5/708 ,  C09D5/23 ,  C10M107/22 ,  C10N40/18 ,  G11B5/702

    摘要： PURPOSE:To lower the coefft. of dynamic friction of a magnetic layer and to obtain a magnetic recording medium having the excellent traveling stability and durability of a tape by adding the powder of a methacrylate crosslinked polymer to a magnetic coating compd. CONSTITUTION:This recording medium has the powder of the methacrylate crosslinked polymer having about 1,000-5,000 degree of polymn. in the magnetic coating compd. The average particle size of the powder of the methacrylate crosslinked polymer is preferably in a 0.05-5(mum) range and the use of the powder having only the single grain size or the combination use of the powders having the different grain size is possible. The powder is preferably added to the magnetic powder in a 0.1-20pts.wt. range per 100pts.wt. magnetic powder. the coefft. of dynamic friction is thereby lowered and the magnetic recording medium having the excellent traveling stability and durability is obtd.

    MAGNETIC RECORDING MEDIUM
    7.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPS63261518A

    公开(公告)日：1988-10-28

    申请号：JP9681487

    申请日：1987-04-20

    申请人： FUJI PHOTO FILM CO LTD

    发明人： OGAWA HIROSHI ,  SAITO SHINJI

    IPC分类号： G11B5/702 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/06 ,  C10M107/22 ,  C10N40/18

    摘要： PURPOSE:To improve running durability and electromagnetic conversion characteristics by incorporating a copolymer contg. a specific polyhydric alcohol deriv. unit as its copolymer component into the binder of a magnetic layer formed by dispersing ferromagnetic powder into the binder. CONSTITUTION:This magnetic recording medium includes a nonmagnetic base and the magnetic layer which is provided on the base and is formed by dispersing the ferromagnetic powder into the binder and the binder thereof contains the copolymer contg. the polyhydric alcohol deriv. unit expressed by formula I. In formula, R denotes hydrogen or methyl group; R denotes a divalent hydrocarbon group of 1-18C; M denotes a residual polyhydric alcohol residue of 3-12C; (m) denotes 0 or 1; (n) denotes 2-5 integer. The ferromagnetic powder to be incorporated into the magnetic layer is preferably the pulverized ferromagnetic powder of a modified iron oxide series and fine magnetic metal powder. The electromagnetic conversion characteristics and running durability are thereby improved.

    MAGNETIC RECORDING MEDIUM
    8.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPS62125536A

    公开(公告)日：1987-06-06

    申请号：JP26532185

    申请日：1985-11-26

    申请人： HITACHI CHEMICAL CO LTD

    发明人： ETO NOBUYUKI ,  SHINPO YASUSHI ,  KOBAYASHI KENGO

    IPC分类号： G11B5/72 ,  C09D171/02 ,  C10M107/22 ,  C10M107/38 ,  C10N40/18 ,  G11B5/725

    摘要： PURPOSE:To improve the surface smoothness of a magnetic layer and the wear resistance of the titled medium by providing the protective layer of a copolymer having a specified composition on a magnetic layer. CONSTITUTION:Magnetic paint contg. magnetic powder is coated on a substrate and magnetic field orientation is applied to form the magnetic layer. The protective layer formed with a copolymer consisting essentially of perhaloolefin, cycloalkyl vinyl ether, alkyl vinyl ether, and hydroxyalkyl vinyl ether is provided on the magnetic layer. Consequently, the surface smoothness of the magnetic layer and the wear resistance of the magnetic recording medium are improved.

    Magnetic recording medium
    9.
    发明专利
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：JPS61122923A

    公开(公告)日：1986-06-10

    申请号：JP24215384

    申请日：1984-11-16

    申请人： Tdk Corp

    发明人： ARIOKA HIROYUKI ,  NOGUCHI KIYOSHI

    IPC分类号： G11B5/66 ,  C10M107/22 ,  C10M107/38 ,  C10N40/18 ,  G11B5/64 ,  G11B5/72 ,  G11B5/725 ,  G11B5/73

    摘要： PURPOSE: To improve runnability, wear resistance, etc. and to obtain a magnetic recording medium having excellent durability by forming a top coat layer contg. a compd. having ≥1 radiation-sensitive unsatd. double bonds and C
    n F
    2n+1 on a thin magnetic film.
    CONSTITUTION: The coating liquid prepd. by dissolving the compd. having such C
    n F
    2n+1 as expressed by the formulas I, II, III (n is 2W20, m is 1 or 2) and ≥1 radiation-sensitive unsatd. double bonds, more preferably further a radiation curing type lubricating agent such as (meth)acrylic acid and acryl alcohol ester, antioxidant and hardener into a solvent such as methyl ethyl ketone is coated on the thin magnetic film formed on a nonmagnetic base body. The coating is dried for about one hour at 100°C after coating and an electron ray, etc. are irradiated thereto in an inert atmosphere such as gaseous N
    2 to polymerize and cure the coating to obtain the wear resistant top coat layer which is uniform, thin and strong and does not peel from the magnetic layer. The magnetic recording medium having the excellent corrosion preventiveness, corrosion resistance and durability is thus obtd.
    COPYRIGHT: (C)1986,JPO&Japio

    摘要翻译： 目的：提高耐运行性，耐磨性等，并通过形成顶涂层来获得具有优异耐久性的磁记录介质。 一个compd 具有≥1辐射敏感的不饱和度。 双键和CnF2n + 1在薄磁性膜上。 规定：涂布液 通过溶解化合物 具有由式I，II，III（n为2-20，m为1或2）表示的CnF 2 n + 1和> = 1的辐射敏感性不饱和度。 更优选进一步将辐射固化型润滑剂如（甲基）丙烯酸和丙烯酸醇酯，抗氧化剂和硬化剂加入溶剂如甲基乙基酮中，形成在非磁性基体上的薄磁膜上。 将涂层在100℃下干燥约1小时，并在气态N 2等惰性气氛中照射电子射线等，以使涂层聚合并固化，得到均匀的耐磨面漆层 ，薄而坚固，不会从磁性层剥离。 因此，具有优异的耐腐蚀性，耐腐蚀性和耐久性的磁记录介质。

    MAGNETIC RECORDING MEDIUM
    10.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPS5829135A

    公开(公告)日：1983-02-21

    申请号：JP12801681

    申请日：1981-08-15

    申请人： HITACHI MAXELL

    发明人： YAMAGUCHI ATSUTAKA ,  YASUI MASAAKI

    IPC分类号： G11B5/702 ,  C09D5/23 ,  C09D109/00 ,  C09D147/00 ,  C10M107/02 ,  C10M107/22 ,  C10M139/00 ,  C10N10/08 ,  C10N40/18 ,  C10N70/00 ,  G11B5/70 ,  G11B5/708

    摘要： PURPOSE:To obtain a magnetic recording medium having superior magnetic characteristics, superior surface smoothness of the magnetic layer and superior durability and contg. magnetic powder with high dispersibility and fillability by hardening a coated film contg. a specified coupling agent and a specified oligomer under radiation so as to produce the magnetic layer. CONSTITUTION:A coated film contg. a titanium coupling agent represented by the general formula, a butadiene oligomer or a deriv. thereof, and magnetic powder, is formed on a substrate and hardened by irradiation to produce a magnetic layer. Besides said oligomer, to the film may be added an oligomer obtd. by bonding acrylic acid or methacrylic acid to a terminal of polyalkylene glycol or polyol by esterification. The preferred amount of the coupling agent to be used is 0.1-10wt% of the amount of the magnetic powder in the magnetic layer.