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    BIAXIALLY ORIENTED LAMINATED FILM
    52.
    发明专利
    BIAXIALLY ORIENTED LAMINATED FILM 失效

    公开(公告)号：JPH05329925A

    公开(公告)日：1993-12-14

    申请号：JP15005592

    申请日：1992-05-19

    Applicant: TORAY INDUSTRIES

    Inventor： MINAMIZAWA HIDEHITO ,  OKAZAKI IWAO ,  ABE KOICHI

    IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L9/00 ,  B32B27/20 ,  B32B27/36 ,  B32B33/00 ,  G11B5/73 ,  G11B5/733 ,  G11B5/704

    Abstract: PURPOSE:To enhance running durability of a film, obtain sufficient strength even in the case of a magnetic tape an improve an RF output by incorporating particles in the outermost layer of a bixially oriented laminated film with a laminated structure of three or more layers in such a manner that relationship between the mean particle diameter of specified particles and the thickness of the outermost layer is specified, and specifying the number of these particles. CONSTITUTION:Particles are contained in the outermost layer on at least one face of a biaxially oriented laminated film consisting of, for example, polyester and having a laminated structure of three or more layers, in such a manner that the mean particle diameter dmm of the particles and the thickness of tnm of the outermost layer have the following relation: 0.2d to 2X10 pieces/mm , and a coefficient DELTAn of axial orientation is +10 or more while an F-5 value in the longitudinal direction of the film is not less than 12g/mm .

    53.
    发明专利
    失效

    公开(公告)号：JPH05305657A

    公开(公告)日：1993-11-19

    申请号：JP13450392

    申请日：1992-04-28

    Applicant: TORAY INDUSTRIES

    Inventor： MINAMIZAWA HIDEHITO ,  OKAZAKI IWAO ,  ABE KOICHI

    IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L9/00 ,  B32B7/02 ,  B32B27/20 ,  B32B27/36 ,  B32B33/00 ,  G11B5/73 ,  G11B5/733 ,  G11B5/704

    Abstract: PURPOSE:To enhance scratch resistance, in a biaxially oriented laminated film having a laminated structure consisting of at least three or more layers, by adding particles having a specific particle size range with respect to the thickness of the outermost layer to the outermost layer at least on the single surface of the film and specifying the number of projections and orientation coefficient of the surface of the film. CONSTITUTION:In a biaxially oriented laminated film having a laminated structure consisting of at least three or more layers at least one of which is biaxially oriented, particles such as silica particles are added to the outermost layer at least on the single surface of the film. In this case, the relation of 0.2d -2X10 /mm and the surface orientation coefficient fn of the film is 0.16-0.280. For example, the particles are added to a polyester film by polymerizing a slurry prepared by dispersing the particles in ethylene glycol with a dicarboxylic acid component.

    54.
    发明专利
    失效

    公开(公告)号：JPH05298660A

    公开(公告)日：1993-11-12

    申请号：JP12804192

    申请日：1992-04-22

    Applicant: TORAY INDUSTRIES

    Inventor： ABE KOICHI ,  OKAZAKI IWAO ,  MINAMIZAWA HIDEHITO

    IPC: B32B3/30 ,  B32B27/20 ,  B32B27/36 ,  C09D5/23 ,  C09D7/12 ,  G11B5/70 ,  G11B5/73 ,  G11B5/733 ,  G11B23/113

    Abstract: PURPOSE:To prevent the pancake from shifting in stage while maintaining superior characteristics as a magnetic tape by incorporating particles in at least the outermost layer on one surface side of laminate structure consisting of >=3 layers so that the relation between specific mean particle size and the layer thickness of the outermost layer is satisfied, and specifying the large/small relation in dynamic friction coefficient between both surfaces. CONSTITUTION:The pancake is formed by winding a base film with a magnetic tape provided with a coating type magnetic layer and the base film is a polyester film in laminate structure of at least >=3 layers which are extruded together; and the layer on at least one surface side contains the particles, 0.1

    BIAXIALLY STRETCHED LAMINATED FILM
    56.
    发明专利
    BIAXIALLY STRETCHED LAMINATED FILM 失效

    公开(公告)号：JPH0584819A

    公开(公告)日：1993-04-06

    申请号：JP27180691

    申请日：1991-09-25

    Applicant: TORAY INDUSTRIES

    Inventor： MINAMIZAWA HIDEHITO ,  OKAZAKI IWAO ,  ABE KOICHI

    IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L9/00 ,  B32B27/20 ,  B32B27/36 ,  G11B5/73 ,  G11B5/733

    Abstract: PURPOSE:To obtain excellent slipperiness, abrasion resistance and electromagnetic conversion characteristics by a method wherein soft particles having low strength are included and, at the same time, surface projections, which are longer in longitudinal direction, are formed. CONSTITUTION:The film concerned has the lamination structure consisting of two or more layers. At least one side outermost layer part contains 0.005-3wt.% of organic polymer particles, the average primary diameter of each of which is 0.1-3mum and the strength S10 of each of which under 10% deformation is 0-10kgf/mm . The ratio beta1/beta2 of the tip radii of curvature of projections in the longitudinal direction and in the width direction of the film of the projections produced by the particles on the surface of the film lies within the range of 1.1-3.0.

    BIAXIALLY STRETCHED LAMINATED FILM
    57.
    发明专利
    BIAXIALLY STRETCHED LAMINATED FILM 失效

    公开(公告)号：JPH0584818A

    公开(公告)日：1993-04-06

    申请号：JP27180591

    申请日：1991-09-25

    Applicant: TORAY INDUSTRIES

    Inventor： OKAZAKI IWAO ,  MINAMIZAWA HIDEHITO ,  ABE KOICHI

    IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L9/00 ,  B32B27/00 ,  B32B27/36 ,  G11B5/73 ,  G11B5/733

    Abstract: PURPOSE:To display excellent abrasion resistance at high speed and electromagnetic conversion characteristics as magnetic medium by a method wherein specified two particle components are included in the surface of at least one side of thin outermost layer part so as to function particles A mainly as the reinforcement of the surface of ground and particles B as the formation of the desired surface ' projections. CONSTITUTION:The biaxially stretched laminated film concerned has the lamination structure consisting of at least three layers. In one side of the outermost layer part of time film, at least two kinds of particles A and B are included. The particle A is selected from either zirconia or silica and, its primary particle diameter is 1-100nm, the ratio of its secondary particle diameter to its primary particle diameter is 3-60, its content is 0.05-2wt.% and its particle concentration in the outermost layer is 0.1 or less. The particle B is selected from either vaterite-type calcium carbonate or crosslink-type organic particle and its primary particle diameter is 0.1-2mum, its content is 0.005-2wt.%, its particle diameter distribution is 0.6 or less and the relationship between the primary particle diameter (d) of the particle B and the thickness (t) of tire layer part including the particle B satisfies the inequality: 0.5d

    BIAXIALLY ORIENTED LAMINATED POLYESTER FILM
    58.
    发明专利
    BIAXIALLY ORIENTED LAMINATED POLYESTER FILM 失效

    公开(公告)号：JPH04294124A

    公开(公告)日：1992-10-19

    申请号：JP8297391

    申请日：1991-03-25

    Applicant: TORAY INDUSTRIES

    Inventor： MINAMIZAWA HIDEHITO ,  OKAZAKI IWAO ,  ABE KOICHI

    IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L9/00 ,  B32B7/02 ,  B32B27/20 ,  B32B27/36 ,  C08L67/02 ,  G11B5/73 ,  G11B5/733

    Abstract: PURPOSE:To improve the high speed scratch characteristics and electromagnetic converting characteristics by incorporating inorg. particles and inactive particles each with a specified loading and a specified particle diameter on the outermost surface layer of a thin layer and forming projections based on both particles on the inside and outside of the outermost surface layer. CONSTITUTION:It is necessary to incorporate 0.05-2.0wt.% inorg. particles with a Mohs hardness of 6 or larger and a mean primary particle diameter of 0.005mum or larger and smaller than 0.3mum on the outermost layer part of a laminated polyester and internally deposited particles are formed by using the inorg. particles as nuclei to form fine projections on the surface of the outermost surface layer. It is also necessary to incorporate 0.05-2.0wt.% inactive particles with a mean primary particle diameter of 0.1mum or larger and 3.0mum or smaller in an inner deposited particle-incorporated layer. These are outer particles to form fine particles with a uniform height on the surface of the thin layer. It is necessary that the ratio of d/t wherein dmum is the mean primary particle diameter of the inactive particle and tmum is the thickness of the particle-incorporated layer is 0.05 or larger and 3 or smaller. It is possible to form required fine and uniform projections on the surface of the layer by keeping this relation while the inactive particles are properly kept on the outermost surface layer.

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