中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

150 records (took 0.024 seconds)

    MAGNETIC RECORDING MEDIUM
    103.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH0729159A

    公开(公告)日：1995-01-31

    申请号：JP17440893

    申请日：1993-07-14

    Applicant: KAO CORP

    Inventor： ISHIKAWA AKIRA ,  YAMASHITA KAZUTAKA ,  KOBAYASHI HIDEYUKI

    IPC: C09D5/23 ,  G11B5/706 ,  G11B5/716 ,  G11B5/73

    Abstract: PURPOSE:To achieve the balanced improvement of both electromagnetic characteristics such as an output and a noise and physical characteristics such as corrosion-resistant properties and a travelling performance. CONSTITUTION:A first magnetic layer which contains at least two types of magnetic powder selected from ferromagnetic metal powder whose main component is iron, cobalt-containing iron oxide powder and barium ferrite powder is formed on a substrate and a second magnetic layer which contains needle- shape cobalt-coated iron oxide whose coercive force is not less than 1300Oe is formed on the first magnetic layer to obtain a magnetic recording medium.

    MAGNETIC RECORDING MEDIUM
    105.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH03290819A

    公开(公告)日：1991-12-20

    申请号：JP9164390

    申请日：1990-04-05

    Applicant: KAO CORP

    Inventor： NAKAYAMA HIDEHIKO ,  UEDA YUKIHIRO ,  YAMASHITA KAZUTAKA

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

    Abstract: PURPOSE:To enable use of a binder having dispersibility for a magnetic powder by incorporating a polyurethane resin containing a certain amt. of metal sulfonate groups as the binder into a magnetic layer. CONSTITUTION:Such a polyurethane resin containing metal sulfonate groups by >=0.1 eq./10 and g is incorporated as the binder into the magnetic layer. If the concn. of the metal sulfonate group is >0.1 eq./10 , enough dispersion of the magnetic powder is not obtained. with >=10 eq./10 g of metal sulfonate group, thixotropy of the coating material increases and the coating material is hard for handling. Thereby, the binder having dispersibility for the magnetic powder without an addition of a dispersant can be used.

    MAGNETIC RECORDING MEDIUM
    106.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH02199624A

    公开(公告)日：1990-08-08

    申请号：JP1814189

    申请日：1989-01-27

    Applicant: KAO CORP

    Inventor： KANNEN NAOKI ,  YAMASHITA KAZUTAKA ,  YANAI HIDETOSHI

    IPC: G11B5/708 ,  C09D5/23 ,  C09D101/18 ,  C09D127/00 ,  C09D127/04 ,  C09D127/06 ,  C09D175/04 ,  G11B5/702 ,  G11B5/71

    Abstract: PURPOSE:To obtain such a medium with excellent durability and little abrasion of the magnetic layer by incorporating a specific ester compd. and a copolymer of vinyl chloride and a compd. having -COOH as a polar group into the magnetic layer. CONSTITUTION:The ester compd. expressed by formula I and the copolymer of vinyl chloride and the compd. having a polar group of -COOH or nitrocellulose having the same polar group are incorporated into the magnetic layer essentially comprising magnetic powder and a binder. In formula I, R represents an aliphatic hydrocarbon group with a branched chain with 3 - 10 carbon and R' represents a satd. or unsatd. aliphatic hydrocarbon group with 7 - 21 carbons. This gives more preferable lubricating property and the obtd. medium has significantly improved durability in a wide range of environments.

    MAGNETIC RECORDING MEDIUM
    107.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH02199623A

    公开(公告)日：1990-08-08

    申请号：JP1814089

    申请日：1989-01-27

    Applicant: KAO CORP

    Inventor： KANNEN NAOKI ,  YAMASHITA KAZUTAKA ,  YANAI HIDETOSHI

    IPC: G11B5/708 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/06

    Abstract: PURPOSE:To obtain such a medium with excellent durability and little abrasion of the magnetic layer by incorporating a specific phosphate copd., magnetic powder subjected to a surface treatment with org. silane compd. having hydolytic alkoxysilane group, and a specific ester compd. into the magnetic layer. CONSTITUTION:The magnetic layer contains the phosphate compd. expressed by formula I, the magnetic powder subjected to the surface treatment with org. silane compd. having hydrolytic alkoxysilane group in one molecule, and the ester compd. expressed by formula II. In formula I, R1 represents a hydrocarbon group with 2 - 28 carbons, A is an alkylene group with 2 - 4 carbons, (n) is 0 or an integer from 1 to 30. In formula II, R represents an aliphatic hydrocarbon group with a branched chain with 3 - 10 carbons and R' represents a satd. aliphatic hydrocarbon group with 7 - 21 carbons. This gives more preferable lubricating property and the obtd. medium has significantly improved durability in a wide range of environments.

    BINDER FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM
    109.
    发明专利
    BINDER FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPS6233331A

    公开(公告)日：1987-02-13

    申请号：JP17299385

    申请日：1985-08-06

    Applicant: KAO CORP

    Inventor： KANNEN NAOKI ,  TSUSHIMA RIKIO ,  YAMASHITA KAZUTAKA ,  OKADA TOMOYUKI

    IPC: G11B5/702 ,  B22F1/02 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/712 ,  H01F1/06

    Abstract: PURPOSE:To improve the dispersibility of magnetic powder, surface smoothness and durability by consisting a binder of a polyurethane resin produced by using a lactone-modified diol. CONSTITUTION:The binder for a magnetic recording medium consisting of the polyurethane resin formed by using the lactone-modified diol expressed by the formula is used. A magnetic layer constituted by dispersing ferromagnetic powder into such binder is proved on a non-magnetic substrate. The polyure thane resin may be either of the polyurethane resin of which both terminals of the molecule are an isocyanate group and the resin of which one terminal is the isocyanate group and the other terminal is a hydroxyl group. The average mol.wt. thereof is relatively preferably in a 1,000-100,000 range. The proportion of the binder and the pulverous ferromagnetic powder. The performance of both the dispersibility and durability is thereby extremely improved.

Patent Agency Ranking