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    VIDEOCASSETTE
    12.
    发明专利
    VIDEOCASSETTE 失效

    公开(公告)号：JPH07307073A

    公开(公告)日：1995-11-21

    申请号：JP9769794

    申请日：1994-05-11

    Applicant: TORAY INDUSTRIES

    Inventor： ABE KOICHI ,  MIYAKE TORU ,  HORIUCHI MITSUHIRO

    IPC: G11B23/04 ,  B32B27/36 ,  B32B33/00 ,  C09D5/23 ,  C09D7/12 ,  G11B5/73 ,  G11B5/733 ,  G11B5/738 ,  G11B23/087 ,  G11B5/704

    Abstract: PURPOSE:To obtain a videocassette suppressing the generation of powder and vibration by combining a specified tape with a cassette made of polypropylene. CONSTITUTION:This videocassette consists of a cassette and a tape obtd. by forming a magnetic layer on a film obtd. by laminating a polyester compsn. contg. particles on at least one side of a polyester compsn. The ratio of the thickness of the magnetic layer to the average particle diameter of the particles is 0.1-10 and guide post members which come in contact with the running face (nonmagnetic face) of the tape in the cassette are made of a poly-propylene- based compsn.

    AROMATIC POLYAMIDE FILM AND MAGNETIC RECORDING MEDIUM USING THE SAME
    13.
    发明专利
    AROMATIC POLYAMIDE FILM AND MAGNETIC RECORDING MEDIUM USING THE SAME 失效

    公开(公告)号：JP2001049007A

    公开(公告)日：2001-02-20

    申请号：JP2000145848

    申请日：2000-05-18

    Applicant: TORAY INDUSTRIES

    Inventor： HORIUCHI MITSUHIRO ,  TSUKUDA AKIMITSU ,  SUEOKA MASANORI

    IPC: C08J7/04 ,  C08J5/18 ,  C08K3/00 ,  C08L77/10 ,  G11B5/65 ,  G11B5/73 ,  H01F10/28

    Abstract: PROBLEM TO BE SOLVED: To obtain a film useful for a magnetic recording medium excellent in electromagnetic conversion characteristics, traveling characteristics, or the like, by making the film have specific numbers of fine and coarse protrusions with specific diameters on the surface. SOLUTION: This film has 2,000 to 100,000,000/mm2 of fine protrusions with a diameter of =4.5 μm on at least one surface of the film. Among the fine protrusions with a diameter of =5 nm and =20 nm is 2,000-100,000/mm2. Furthermore, it is preferable that the number of the coarse protrusions with a diameter of >=4.5 μm is =70% of the entire arom. rings. For forming the fine protrusions, there is a method, e.g. in which inorg. and/or org. particles are added to the arom. polyamide. A magnetic recording medium is obtd. by providing a magnetic layer to at least one surface of this film.

    AROMATIC POLYAMIDE FILM AND MAGNETIC RECORDING MEDIUM
    14.
    发明专利
    AROMATIC POLYAMIDE FILM AND MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JP2000344913A

    公开(公告)日：2000-12-12

    申请号：JP2000078658

    申请日：2000-03-21

    Applicant: TORAY INDUSTRIES

    Inventor： TSUKUDA AKIMITSU ,  SUEOKA MASANORI ,  HORIUCHI MITSUHIRO

    IPC: C08J5/18 ,  B29C41/26 ,  B29C41/28 ,  G11B5/65 ,  G11B5/73

    Abstract: PROBLEM TO BE SOLVED: To obtain an aromatic polyamide film excellent in output characteristics and traveling durability. SOLUTION: This aromatic polyamide film has 20×104-1×109/mm2 dents having 3-300 nm depth at least on one surface. Preferably, the dents are regulated so that the ratio of the standard deviation of the depths of the dents to the average depth of the dents may be =10 nm heights may be present in 1 mm2 area, and 0-300 coarse protrusions having >=100 nm heights may be present in 100 cm2 area. The magnetic recording medium can be obtained by using the aromatic polyamide film as a nonmagnetic supporter, and the magnetic recording medium can be used in a system having a magneto-resistive reproducing head (an MR head).

    FILM
    17.
    发明专利
    FILM 审中-公开

    公开(公告)号：JP2003268129A

    公开(公告)日：2003-09-25

    申请号：JP2002077830

    申请日：2002-03-20

    Applicant: TORAY INDUSTRIES

    Inventor： TSUKUDA AKIMITSU ,  HORIUCHI MITSUHIRO ,  ITO NOBUAKI ,  TAKANISHI KEIJIRO

    IPC: C08J5/18 ,  C08G79/04

    Abstract: PROBLEM TO BE SOLVED: To provide a film excellent in homogeneity and surface smoothness and high in productivity. SOLUTION: The film is one at least either surface of which has a center line average surface roughness of 5 nm or smaller and which is made from a polymer comprising structural units each being a phosphonic acid ressidue represented by structural formula (1) (wherein R 1 is an organic group; and X 1 is O, S, or Se) and structural units each of which is a dihydric phenol residue represented by structural formula (2) (wherein R 2 and R 3 are each H, NO 2 , a halogen atom, a 1-20C aliphatic group, or an aromatic group; p and q are integers with the proviso that 0≤p+q≤8; and Y 1 is O, S, an alkylene, an alkylidene, a cycloalkylene, a halo-substituted alkylene, a halo-substituted alkylidene, a phenylalkylidene, a carbonyl group, a sulfo group, an aliphatic phsphine oxide group, an aromatic phsphine oxide group, an alkylsilane group, a dialkylsilane group, or a fluorene group). COPYRIGHT: (C)2003,JPO

    FILM
    18.
    发明专利
    FILM 审中-公开

    公开(公告)号：JP2003266534A

    公开(公告)日：2003-09-24

    申请号：JP2002077812

    申请日：2002-03-20

    Applicant: TORAY INDUSTRIES

    Inventor： TSUKUDA AKIMITSU ,  HORIUCHI MITSUHIRO ,  ITO NOBUAKI ,  TAKANISHI KEIJIRO

    IPC: C08J5/18 ,  B29C41/28 ,  B29C55/02 ,  B29K85/00 ,  B29L7/00 ,  C08G79/04

    Abstract: PROBLEM TO BE SOLVED: To provide a transparent film excellent in dimension/shape stability and optical characteristic stability even when the film is processed and used regardless of a thin film. SOLUTION: The transparent film is characterized in that the thickness is 10-100 μm, the single elongation ratio after heating at 80°C for 10 min is not more than 2% and the light transmissivity at a wavelength of 400-700 nm is not less than 85%. COPYRIGHT: (C)2003,JPO

    ROUGHNESS-CHANGEABLE FILM
    19.
    发明专利
    ROUGHNESS-CHANGEABLE FILM 失效

    公开(公告)号：JP2000344914A

    公开(公告)日：2000-12-12

    申请号：JP2000098098

    申请日：2000-03-31

    Applicant: TORAY INDUSTRIES

    Inventor： TSUKUDA AKIMITSU ,  HORIUCHI MITSUHIRO ,  SUEOKA MASANORI

    IPC: C08J5/18 ,  B29C71/02 ,  G11B5/73

    Abstract: PROBLEM TO BE SOLVED: To obtain a film having a surface roughness capable of being enlarged by heat treatment at the processing time. SOLUTION: The relation of an average roughness Ra1 before the heat treatment and the average roughness after the heat treatment at least on one surface is regulated so as to satisfy the relation of Ra2/Ra1>1 in a film composed of an organic polymer. The organic polymer is the one containing >=70 mol% aromatic polyamide and has >=7 GPa Young's modulus at least in one direction. Further, the average roughness before and after the heat treatment at 200 deg.C for 1 min satisfy the relation of 1.1

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