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公开(公告)号：JPH06210723A
公开(公告)日：1994-08-02
申请号：JP658393
申请日：1993-01-19
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , ABE KOICHI , TANAKA HIROYUKI
Abstract: PURPOSE:To provide a biaxially oriented thermoplastic resin film suitable as a base film for a video tape not generating the surface shaving of the base film even when repeated running is performed within a VTR, suppressed in drop out, reduced in the generation of a damage and holding running durability equal to that of a back coat layer. CONSTITUTION:In a biaxially oriented thermoplastic resin film constituted by laminating a layer (A-layer) consisting of crosslinked polymer particles and a thermoplastic resin A on at least the single surface of a layer (B-layer) composed of a thermoplastic resin B, the intrinsic viscosity of the A-layer is set to 0.75 or more, the ratio t/d of the thickness (t) of the A-layer and the average particle size (d) of the crosslinked polymer particles contained in the thermoplastic resin A is set to 0.1-5 and the content of the particles in the thermoplastic resin A is set to 1-20wt.%.
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公开(公告)号：JP2004005789A
公开(公告)日：2004-01-08
申请号：JP2002157379
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 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 organic compound particles and an organic compound is formed on a surface A of the polyester film, and the weight ratio of the fine organic compound particles to the organic compound in the coating film is 1:0.2 to 1:5.0, and the diameters of protrusions on the fine surface of the coating film surface are 20-60 nm and the number of them is 3-100 million/mm 2 , and also the surface roughness Ra of the coating film is 0.5-1.9 nm. COPYRIGHT: (C)2004,JPO
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公开(公告)号：JP2003151124A
公开(公告)日：2003-05-23
申请号：JP2002071941
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 camera which is in the same size as a commercial DVC and compatible and which is capable of recording and reproducing for ultra-long time as long as 7 hours or more for a single cassette. SOLUTION: In the digital video tape recorder, an MR head is used as a reading magnetic head and a magnetic tape of 6.35 mm width is used for recording and reproducing. The magnetic tape comprises a polyester film and a ferromagnetic metal thin film layer formed on the film surface. The tape has 6.35 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：JP2003151120A
公开(公告)日：2003-05-23
申请号：JP2002071943
申请日：2002-03-15
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , FUKADA KAZUYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic tape which is capable of ultra-long recording as long as 24 hours or more (VHS) and 70 hours or more (D-VHS) by using a commercial VHS or D-VHS video tape recorder and which maintains preferable picture quality almost equal to those in the standard mode. SOLUTION: The magnetic recording tape comprises a polyester film and a ferromagnetic metal thin film layer formed on the film surface. The tape has
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公开(公告)号：JP2002269730A
公开(公告)日：2002-09-20
申请号：JP2001061903
申请日：2001-03-06
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , NOMURA FUMIYASU
Abstract: PROBLEM TO BE SOLVED: To provide a base material suitable for manufacturing a magnetic recording medium having fewer 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 a metal, a semi metal, an alloy, an oxide and a composite of them is formed on a surface B on one side of a polyester film, the other surface A has an Ra value of 1-5 nm, the substrate has a thickness of 2-6 μm and Young's moduli in the longitudinal and the lateral directions of >=5,500 MPa and >=7,500 MPa, respectively, and the surface on the reinforcing film forming side of the substrate has a surface electric resistance of >=1 MΩ/sq.
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Patent Agency Ranking
公开(公告)号：JP2002237025A
公开(公告)日：2002-08-23
申请号：JP2001030659
申请日：2001-02-07
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , FUKADA KAZUYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a supporting body for a magnetic recording medium, suitable for manufacturing a magnetic recording medium, especially a DVC-LP tape, having the reduced number of DOs, excellent running durability and excellent storage performance of data. SOLUTION: The supporting body for the magnetic recording medium has a reinforcing film consisting of materials elected from metal, semi-metal, alloy and oxide and composite of them and formed on one surface B of a polyester film. The other surface A has 1-5 nm Ra value and the supporting body has 2-6 μm thickness, >=5,500 MPa and >=7,500 MPa Young's moduli in longitudinal and lateral directions respectively and
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公开(公告)号：JP2002140812A
公开(公告)日：2002-05-17
申请号：JP2000335030
申请日：2000-11-01
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , FUKADA KAZUYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a polyester film for a base film suitable for forming a digital video tape excellent in electromagnetic transducing characteristics and nearly free from DO, wherein a cooling can not become dirty when the film is used to manufacture a magnetic tape even in high vapor deposition speed. SOLUTION: The polyester film for a magnetic recording medium consists of a laminated film consisting of a layer A and a layer B and a coating layer formed on the surface thereof. A surface A on the side of the layer A has 2-4 nm SRa value and 10-40 nm SRz value. Fine particle for forming surface projections on a surface B on the side of the layer B are contained in the layer B and the fine particles have 50-500 nm average particle size. The layer B has 0.01-1.0 wt.% fine particle content and the coating layer applied and formed on the side of the layer B has 1-10 nm thickness. A ferromagnetic metallic thin film layer is provided on the outer side of the surface A to form the polyester film used as a magnetic recording medium.
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公开(公告)号：JP2002050025A
公开(公告)日：2002-02-15
申请号：JP2000230660
申请日：2000-07-31
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , FUKADA KAZUYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a polyester film for a magnetic recording medium, suitable for a magnetic tape for DVC and DVC-LP capable of reducing the wear of a magnetic head, brought by the running of the tape, and prolonging the life of the magnetic head. SOLUTION: In the polyester film for the magnetic recording medium, a coating film containing fine particles and an organic compound is formed on one side surface of the polyester film. Fine surface protrusions of the fine particles exist on a surface A of the coating film and the fine particles have 10-50 nm particle diameters. And the surface A has 3,000,000-90,000,000 fine surface protrusions/mm2 and the fine particles are exposed from the surface A of the coating film by
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公开(公告)号：JP2001243616A
公开(公告)日：2001-09-07
申请号：JP2000377517
申请日：2000-12-12
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , CHIKUGI TOSHIHIRO , MORIMOTO TSUTOMU
IPC: B32B27/36 , B32B27/00 , B32B37/15 , C08K5/098 , C08K5/42 , C08L67/02 , G11B5/62 , G11B5/73 , G11B5/733
Abstract: PROBLEM TO BE SOLVED: To provide a base film suitable for forming a digital video tape excel lent in electromagnetic transducing characteristics, less in drop-out over its entire length from the winding core part to the outer layer part of a product. SOLUTION: The polyester film for magnetic recording medium formed by layering a polyester layer A and a polyester layer B is characterized in that the surface of the layer A side has 2-4 nm centerline average surface roughness (SRa value) and 10-40 nm ten-point average surface roughness (SRz value) and the layer B contains fine particles αhaving >=50 nm and =250 nm and
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40.发明专利
公开(公告)号：JP2001243615A
公开(公告)日：2001-09-07
申请号：JP2000055350
申请日：2000-03-01
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , FUKADA KAZUYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a long-length polyester film roll for magnetic recording medium suitable for manufacturing a digital video tape having less DO with high productivity. SOLUTION: The polyester film roll for magnetic recording medium, wound on a cylindrical core, is characterized in that a polyester film has 3-7 μm thickness, 2-5 nm SRa value of one surface A, 12-18 nm SRa value of the other surface B, 50,000-500,000 protruding parts having 100-200 nm height per mm2, =0.54 μm height per 100 cm2, 15,000-50,000 m film length and 1.1-2.5% air bite-in ratio of the air contained between films.
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