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公开(公告)号：JPH071577A
公开(公告)日：1995-01-06
申请号：JP10326694
申请日：1994-04-19
Applicant: TORAY INDUSTRIES
Inventor： NAKAJIMA SHOJI , ABE KOICHI , OKAMOTO KATSUYA
Abstract: PURPOSE:To obtain a desired surface form capable of suppressing the formation of voids, capable of densely forming hardly cut surface projections and enhanced in surface running durability. CONSTITUTION:A polyester film is a biaxially oriented film based on polyester A and characterized by that the number of projections of at least one surface thereof is 5X10 /mm or more and the ratio (NR) of the number of projections/ the number of particles being the ratio of the number of projections and the number of the particles contained in the surface layer on the film is 5 or more and the average height of projections is 0.01-0.8mum.
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公开(公告)号：JPH06320694A
公开(公告)日：1994-11-22
申请号：JP13402393
申请日：1993-05-11
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NAKAJIMA SHOJI , OKAMOTO KATSUYA
Abstract: PURPOSE:To obtain a laminated film adapted to be used for a magnetic tape in which polyester A layers laminated on both side surfaces of a polyester B layer can be formed of the same polyester A and simultaneously front and rear surfaces can be formed of surface states having desired cutting resistances, image quality, etc. CONSTITUTION:A laminated film comprises A layers each containing polyester A as a main ingredient and laminated on both side surfaces of a B layer containing polyester B as a main ingredient, wherein A1 of surface roughness of the one A layer is 0.2-20nm and A2 of surface roughness of the other A layer is 5-50nm, and A1 is smaller than A2, and a method for manufacturing the same is provided.
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公开(公告)号：JPH06320693A
公开(公告)日：1994-11-22
申请号：JP13402293
申请日：1993-05-11
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , ABE KOICHI , NAKAJIMA SHOJI
Abstract: PURPOSE:To provide a film in which occurrence of a trouble upon generation of void can be suppressed and fine protrusions are formed densely and uniformly on a surface. CONSTITUTION:A laminated polyester film comprises an A layer containing polyester A as a main ingredient and laminated at least on one side surface of a B layer containing polyester B as a main ingredient, wherein surface protrusions due to fine crystal uniformly and regularly exist and a flat surface existing among the protrusions is small.
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公开(公告)号：JPH05318581A
公开(公告)日：1993-12-03
申请号：JP15005192
申请日：1992-05-19
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , NAKAJIMA SHOJI , 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 improve traveling properties and protrusion breaking strength, to improve adhesiveness with a magnetic layer and to reduce a decrease in picture quality of a biaxially oriented laminated film by forming the film in a laminated structure of three or more layers, incorporating special particles in an outermost layer of its one side surface, and simultaneously processing means such as specifying crystallinity of the outermost layer. CONSTITUTION:A biaxially oriented laminated film is formed of a laminated structure of at least three or more layers. In this case, particles are contained at least in an outermost layer of its one side surface of the film. The relationship between a mean particle size (d) (mum) of the particle and a thickness(t) of the outermost layer is so set as to satisfy 0.2d -2X10 /mm . Further, the outermost layer of at least one side surface is set to lower crystallinity than that of an intermediate layer. Thus, fine protrusions on the surface of the film are optimized to improve traveling properties and protrusion breaking strength, adhesiveness with a magnetic layer at the time of using it as a magnetic medium is improved, and a decrease in picture quality is reduced.
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公开(公告)号：JPH05154907A
公开(公告)日：1993-06-22
申请号：JP34944591
申请日：1991-12-09
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , ABE KOICHI , NAKAJIMA SHOJI
IPC: B29C55/12 , B29K105/16 , B29L9/00 , B32B3/30 , B32B7/02 , B32B27/08 , B32B27/20 , C08J5/18 , G11B5/733
Abstract: PURPOSE:To provide biaxially orientated thermoplastic resin film, by which the falling of particles off base film in the production process of magnetic recording medium is suppressed and consequently drop-out is reduced. CONSTITUTION:In the biaxially orientated thermoplastic resin film concerned, at least the ratio (sigma/h) of the standard deviation (sigma) of the heights of projections on one surface of the film to the average height (h) of the projections is 0.5 or less and, further, the ratio (h/d) of the average height (h) of the projections to the average diameter (d) of projections is 0.17 or less.
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Patent Agency Ranking
公开(公告)号：JP2004005788A
公开(公告)日：2004-01-08
申请号：JP2002157378
申请日：2002-05-30
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , FUKADA KAZUYOSHI
Abstract: PROBLEM TO BE SOLVED: To prepare a digital recording magnetic tape in which the noise hardly occurs at reading with an MR head, the picture quality is excellent, and the track pitch is ≤6 μm without increasing dropouts, and which is not wearable and has the satisfied run/durable property, and to provide a polyester film for a magnetic recording medium effective for this purpose. SOLUTION: This polyester film for the magnetic recording medium is composed in such a manner that a coating film containing fine particles and an organic compound is formed on a surface A of the polyester film, and diameters of protrusions on the fine surface of the coating film surface are 25-60 nm and the number of them is 3-100 million/mm 2 , and also the number of protrusions on the fine surface is ≤3000/mm 2 . COPYRIGHT: (C)2004,JPO
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公开(公告)号：JP2003242630A
公开(公告)日：2003-08-29
申请号：JP2002041562
申请日：2002-02-19
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , FUKADA KAZUYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a support for a magnetic recording medium which is little in the number of pieces of DOs and is excellent in traveling durability even in the case of photographing in an LP mode and reproducing with a model different from the model used for photographing, more particularly a magnetic recording medium adequate for manufacturing DVC-LP tapes. SOLUTION: The support for the magnetic recording medium is formed with a reinforcing film consisting of a material selected from metals, semimetals, alloys and their oxide and composite on the surface on at least one side of a polyester film, in which the index value MTD of the bending moment in a transverse direction expressed by the following equation is ≥150 GPa.μm 3 . In the equation, (y) is the variable indicating the position of the thickness direction within the support and the central position in the thickness direction is defined as zero; the surface position of the support formed with the reinforcing film as t/2 (μm): the other surface position of the base as -t/2 (μm); and ETD is the Young's modulus (GPa) in the transverse direction of the component in the position (y). COPYRIGHT: (C)2003,JPO
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公开(公告)号：JP2003151119A
公开(公告)日：2003-05-23
申请号：JP2002071942
申请日：2002-03-15
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , FUKADA KAZUYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a digital video tape recorder which is in the same size as a commercial VHS and compatible and which is capable of recording and reproducing for an ultra-long time as long as 96 hours or more by a single cassette with high picture quality, and to provide a method for archiving the image data photographed by a digital camera or the like. SOLUTION: In the digital video tape recorder, an MR head is used for the reading magnetic head and a magnetic tape of 12.65 mm width is used for recording and reproducing. The magnetic tape has a ferromagnetic metal thin film layer formed on the surface of a polyester film. The tape has 12.65 mm width, 20 to 60 nm thickness of the ferromagnetic metal thin film and 2.5 to 6.0 μm track width and is capable of digital magnetic recording.
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公开(公告)号：JP2002269729A
公开(公告)日：2002-09-20
申请号：JP2001061902
申请日：2001-03-06
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , FUKUSHIMA KAZUHIRO
Abstract: PROBLEM TO BE SOLVED: To provide a base material suitable for manufacturing magnetic recording medium having few number of dropouts (DOs) and excellent running durability, especially a DVC-LP tape. SOLUTION: In the base material for the magnetic recording medium, a reinforcing film consisting of a material selected from the oxide of a metal, the oxide of a semimetal, a semimetal and the composite consisting of those and a metal is formed on the surface B on one side of a polyester film, the other surface A has 1-5 nm Ra value and the substrate has a thickness of 2-6 μm, Young's moduli in the longitudinal and the lateral directions of >=5,500 MPa and >=7,500 MPa, respectively, and an infrared ray transmittance of >=70%.
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公开(公告)号：JP2002183933A
公开(公告)日：2002-06-28
申请号：JP2000385198
申请日：2000-12-19
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , FUKADA KAZUYOSHI , OKAMOTO KATSUYA
Abstract: PROBLEM TO BE SOLVED: To provide a polyester base film suitable for manufacturing a digital video tape with excellent electromagnetic conversion characteristics and little DO(drop out) even when the vapor deposition rate is increased. SOLUTION: The polyester film is obtained by laminating a layer A which forms one side surface (a) with a layer B which forms the other side surface (b). The SRa value and SRz value of the surface (a) are 2 to 5 nm and 10 to 40 nm, respectively. The layer B contains fine particles α to form surface projections on the surface (b), and the average particle size of the fine particles αis >=250 nm and
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