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    AROMATIC POLYAMIDE FILM, METHOD OF MANUFACTURE THEREOF AND MAGNETIC RECORDING MEDIUM
    21.
    发明专利
    AROMATIC POLYAMIDE FILM, METHOD OF MANUFACTURE THEREOF AND MAGNETIC RECORDING MEDIUM 审中-公开

    公开(公告)号：JP2003200542A

    公开(公告)日：2003-07-15

    申请号：JP2002000556

    申请日：2002-01-07

    Applicant: TORAY INDUSTRIES

    Inventor： HORIUCHI MITSUHIRO ,  TSUKUDA AKIMITSU ,  ITO NOBUAKI

    IPC: C08J7/04 ,  B29C55/02 ,  B29K77/00 ,  B29L7/00 ,  B32B27/34 ,  G11B5/73 ,  G11B5/84

    Abstract: PROBLEM TO BE SOLVED: To provide an aromatic polyamide film showing uniform surface characteristics and an improvement of the shape of the film wound in a roll and the suppression of a generated foreign substance to a minimum level at the time of recycling the film, and a magnetic recording medium showing outstanding output characteristics. SOLUTION: This aromatic polyamide film has a thin resin film with a surface sulfur concentration S/C of 0.003 or less as measured by an X-ray electron spectroscopy on a protuberance forming face and 1×10 6 to 1×10 8 pieces/mm 2 of the protuberance consisting of a particle having an average particle diameter of 10 to 100 nm. In addition, this film shows that the ratio of a mean roughness RaA (nm) of a central area at a scan range angle of 2 μm measured by an interatomic force microscope (AFM) to a mean roughness RaB (nm) of a central area at a scan range angle of 30 μm, satisfies formula (1): 0.5≤RaA/ RaB≤1.0...(1). COPYRIGHT: (C)2003,JPO

    AROMATIC POLYAMIDE FILM AND MAGNETIC RECORDING MEDIUM USING SAME
    23.
    发明专利
    AROMATIC POLYAMIDE FILM AND MAGNETIC RECORDING MEDIUM USING SAME 失效

    公开(公告)号：JP2001011215A

    公开(公告)日：2001-01-16

    申请号：JP2000123775

    申请日：2000-04-25

    Applicant: TORAY INDUSTRIES

    Inventor： TSUKUDA AKIMITSU ,  SUEOKA MASANORI ,  HORIUCHI MITSUHIRO

    IPC: C08J7/04 ,  C08J5/18 ,  C08L77/00 ,  C08L101/00 ,  G11B5/73

    Abstract: PROBLEM TO BE SOLVED: To obtain an aromatic polyamide film which shows good stability during processing and can give a magnetic recording medium having a high and constant output, reduced output fluctuations, and improved durability, wherein the unevenness of the number of surface protrusions on either surface of the film is specified. SOLUTION: In the aromatic polyamide film, the unevenness of the number of surface protrusions on either surface of the film is at most 20%, the Poisson's ratio i.e., a ratio between strains in the transverse and machine directions is below 0.4, and the surface having an unevenness of the number of protrusions of at most 20% contains a para-orienting aromatic polyamide and 0.1-20 wt.% different polymer. Further, it is desirable that the film has 200,000-20,000,000/mm2 surface protrusions having a height of 5-60 nm, at most 100,000/mm2 surface protrusions having a height of above 60 nm, and an unevenness of the number of surface protrusions of at most 10%. A magnetic layer having a thickness of at most 0.3 μm and having an unevenness of the number of protrusions of at most 20% is formed on at least either surface of the film to obtain a magnetic recording medium.

    AROMATIC POLYAMIDE FILM, ITS PRODUCTION, AND MAGNETIC RECORDING MEDIUM
    24.
    发明专利
    AROMATIC POLYAMIDE FILM, ITS PRODUCTION, AND MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH11152352A

    公开(公告)日：1999-06-08

    申请号：JP31876697

    申请日：1997-11-19

    Applicant: TORAY INDUSTRIES

    Inventor： SUEOKA MASANORI ,  TSUKUDA AKIMITSU ,  HORIUCHI MITSUHIRO

    IPC: C08J5/18 ,  B29C55/12 ,  B29K77/00 ,  B29K105/16 ,  B29L7/00 ,  C08K3/36 ,  C08L77/00 ,  G11B5/66 ,  G11B5/73 ,  G11B5/733 ,  G11B5/78

    Abstract: PROBLEM TO BE SOLVED: To obtain a film excellent in high-speed cutting resistance and dubbing resistance by incorporating a specified amount of particles having a specified mean particle diameter and a specified particle size distribution coefficient in a film based on an aromatic polyamide. SOLUTION: This film is prepared by incorporating 0.01-10 wt.%, desirably, 0.01-5 wt.% more desirably, 0.02-1 wt.%, based on the aromatic polyamide, particles having a mean article diameter of 10-500 nm, desirably, 20-300 nm, more desirably 40-200 nm, a particle size distribution coefficient of 1.3 or below, desirably, 1,2 or below, more desirably, 1.1 or below and in which the centerline surface roughness Ra of one surface is 0.5-10 nm, and the centerline surface roughness Ra' of the other surface is 3-50 nm. it is desirable that the film contains organic particles (e.g. crosslinked PS particles) and inorganic particles (e.g. colloidal silica) in such amounts that the relationship: 0.001

    PARTICULATE CALCIUM CARBONATE AND ITS PRODUCTION
    25.
    发明专利
    PARTICULATE CALCIUM CARBONATE AND ITS PRODUCTION 失效

    公开(公告)号：JPH09165217A

    公开(公告)日：1997-06-24

    申请号：JP32467995

    申请日：1995-12-13

    Applicant: TORAY INDUSTRIES

    Inventor： HORIUCHI MITSUHIRO ,  TSUKUDA AKIMITSU ,  ITO NOBUAKI

    IPC: C01F11/18

    Abstract: PROBLEM TO BE SOLVED: To provide a uniform particulate calcium carbonate having small particle diameter and useful as an industrial material, especially a particulate calcium carbonate rapidly and uniformly proceeding chemical reactions such as the neutralization reaction with an acid and having low impurity content and provide a process for producing the particulate calcium carbonate. SOLUTION: This particulate calcium carbonate has an average particle diameter of 0.1-100μm and a particle size distribution having a relative standard deviation of to 10 .

    ACRYLIC RESIN FILMS AND PROCESS FOR PRODUCING THE SAME
    27.
    发明公开
    ACRYLIC RESIN FILMS AND PROCESS FOR PRODUCING THE SAME 审中-公开
    丙烯酸类树脂膜及其制造方法

    公开(公告)号：EP1754752A4

    公开(公告)日：2007-12-19

    申请号：EP05734442

    申请日：2005-04-22

    Applicant: TORAY INDUSTRIES

    Inventor： MAEKAWA SHIGETOSHI ,  MORIYAMA HIDEKI ,  HORIUCHI MITSUHIRO ,  TSUKUDA AKIMITSU

    IPC: C08L33/00 ,  C08F8/48 ,  C08J5/18 ,  C08L33/04 ,  C08L33/06 ,  G02B1/04

    CPC classification number: G02B1/04 ,  C08L33/04 ,  C08L33/064 ,  C08L33/06 ,  C08L2666/04

    Abstract: [PROBLEMS] To provide: a novel, industrially useful acrylic resin film excellent in all of transparency, weatherability, heat resistance, and toughness, in view of the fact that there has been no acrylic resin film having such properties; an acrylic resin film which comprises the acrylic resin film having, e.g., a hard coating layer formed on at least one side of the film and further having an antireflection film formed on at least one side of the film; and an optical filter comprising this film. [MEANS FOR SOLVING PROBLEMS] The former acrylic resin film comprises an acrylic resin having units of glutaric anhydride and acrylic elastomer particles incorporated in the resin, and has a total light transmittance of 91% or higher, a haze of 1.5% or lower, a value of the number of folding operations of 20 or larger, and a degree of thermal shrinkage less than 5% in at least one of the machine direction and the transverse direction in a thermal shrinkage test.

    AROMATIC POLYAMIDE FILM AND MAGNETIC RECORDING MEDIUM
    29.
    发明专利
    AROMATIC POLYAMIDE FILM AND MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JP2002146058A

    公开(公告)日：2002-05-22

    申请号：JP2000341522

    申请日：2000-11-09

    Applicant: TORAY INDUSTRIES

    Inventor： TSUKUDA AKIMITSU ,  HORIUCHI MITSUHIRO ,  ITO NOBUAKI

    IPC: C08J5/18 ,  B29C41/24 ,  B29C41/46 ,  C08L39/06 ,  C08L77/10 ,  C08L101/00 ,  G11B5/73 ,  G11B5/733

    Abstract: PROBLEM TO BE SOLVED: To provide an aromatic polyamide film having running durability improved without reducing output characteristics, and capable of reducing abrasion of a magnetic head. SOLUTION: This aromatic polyamide film has at least on one surface a protrusion group A having 50×104-10,000×104/mm2 existing density of protrusions having 0.025 or more and less than 0.3 flatness and 5-50 nm height, and a protrusion group B having 0.1×104-1,000×104/mm2 existing density of protrusions having 0.3-1 flatness and 5-150 nm height, where the ratio Hb/Ha of the average height Hb (nm) of the protrusion group B to the average height Ha (nm) of the protrusion group A is in the range of 0.6-6.

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