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公开(公告)号：JP2002050028A
公开(公告)日：2002-02-15
申请号：JP2000230657
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 capable of giving not only a videotape nearly free from dropout but also a vapor- deposited magnetic tape for data backup having a low error rate. SOLUTION: The polyester film has fine surface projections comprising fine particles on one face A. The particle diameter of the fine particles is 10-50 mn, the number of the fine surface projections on the face A is 3,000,000-90,000,000 per 1 mm2, the number of surface projections having 50-120 nm height is =120 nm height is
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92.发明专利
公开(公告)号：JP2001243614A
公开(公告)日：2001-09-07
申请号：JP2000053135
申请日：2000-02-29
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , ONO MASAAKI , FUKADA KAZUYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a long-length polyester film roll having >=10,000 m length from which a DVC tape is manufactured with high productivity. SOLUTION: The polyester film roll for magnetic recording medium formed by winding a polyester film on a cylindrical core has 3-7 μm film thickness, 10,000-40,000 m film length, 2-5 nm SRa value of one surface A of the film and -1.0-+1.0 kV potential of the film by electrification. A ferromagnetic metal thin film is provided by vacuum deposition on the one surface A of the polyester film supplied from the polyester film roll for magnetic recording medium to manufacture a magnetic recording medium.
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公开(公告)号：JPH11339251A
公开(公告)日：1999-12-10
申请号：JP15990198
申请日：1998-05-25
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , TAMADA KAZUSHI , OKAMOTO KATSUYA
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium which can be formed as a thin film and is capable of satisfactorily reproducing a digital recording signal, even at the time of storing the medium for a long period of time under high temperature and high humidity conditions and in particular, by which a signal can be subjected to linear digital recording in the longitudinal direction with a fixed head. SOLUTION: This recording medium is provided with a polyester film one surface A of which has a 2 to 20 nm SRa value (surface roughness value defined in JIS B 0601 or other equivalent standards) and the other surface B of which has a 2 to 50 nm SRa value and also, which has a Young's modulus of 7,000 MPa or larger in the longitudinal direction and a Young's modulus of 6,000 MPa or larger in the width direction, a nonmagnetic metal or metal oxide layer formed at least on the surface B, and a magnetic layer formed on the side of the surface A.
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公开(公告)号：JPH11262992A
公开(公告)日：1999-09-28
申请号：JP6897998
申请日：1998-03-18
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , NAKAMORI YUKARI , NAKAJIMA SHOJI
IPC: G11B5/64 , B29C55/12 , B32B27/18 , B32B27/36 , B32B33/00 , C08J5/18 , G11B5/66 , G11B5/73 , G11B5/733
Abstract: PROBLEM TO BE SOLVED: To prevent a surface precipitated oligomer with excellent feeding durability by forming specific number or more of fine protrusions having a specific height on at least one surface, incorporating a specific amount of more of organic additive in a film, and further specifying its mean dispersion size. SOLUTION: The film is formed of a polyester, and 2,000,00 pieces/mm or more of fine protrusions having a height of 10 to 50 nm ar formed at least on one side surface of the film. Further, 0.01 to 1.5 wt.% of an organic additive is contained in the film. As the additive, a higher ester is used, and added immediately before a polymerization of a polyester is completed. After completion of the polymerization, it is again kneaded, and mean dispersion size in the film is set to less than 0.2 μm. To form the fine protrusions, the film is obtained by laminating three or more layers. Thus, excellent feeding durability can be performed, and faults of the film surface can be suppressed.
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公开(公告)号：JPH1177932A
公开(公告)日：1999-03-23
申请号：JP24551297
申请日：1997-09-10
Applicant: TORAY INDUSTRIES
Inventor： NAKAMORI YUKARI , OKAMOTO KATSUYA , TANAKA HIROYUKI
Abstract: PROBLEM TO BE SOLVED: To improve a traveling property, a dropout, and an anti-abrasion property of a laminated polyester film by allowing protrusions and recessions to coexist on at least one side surface of a polyester film, and specifying a number ratio in both of them, and a ratio between the protrusion height and the average depth respectively. SOLUTION: Protrusions and recessions are allowed to coexist on at least one surface of a polyester film having a layer formation of at least three layers or more, and the relation of a number ratio X (protrusion numbers pieces/mm )/ Y (recession numbers pieces/mm ) of both of them is set in the range of 10-1000. If the value of X/Y is in the lower limit or below, an output characteristic lowers as being made into a magnetic tape, and if it exceeds the upper limit, its traveling durability and anti-abrasion property get worse. In addition, a ratio (h/d) between the average height (h) of the protrusions and the average depth (d) of the recessions existing on the surface of the polyester film is in the range of 0.5-3; preferably 0.8-2.5. At the lower limit or below of (h/d), a dropout occurs, and as it comes beyond the upper limit, its traveling durability and anti-abrasion property worsen.
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Patent Agency Ranking
公开(公告)号：JPH1134267A
公开(公告)日：1999-02-09
申请号：JP19876797
申请日：1997-07-24
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , MIYAKE TORU , NAKAJIMA SHOJI
IPC: B32B27/36 , C08G63/183 , C08G63/189 , G11B5/73 , G11B5/704
Abstract: PROBLEM TO BE SOLVED: To deal with a high density formation of a floppy disk by forming an inner layer part of a laminated film of at least three-layer structure made of a surface layer and the inner layer of polyethylene-2,6-naphthalate, and forming specific number of protrusions each having a specific height at least on one surface. SOLUTION: The laminated polyester film adapted to a base film for a large capacity floppy disk having a storage capacity of 100 Mbits or more is formed of a laminated film of at least three-layer structure having a surface layer and an inner layer, and its inner layer part is formed of polyethylene-2,6- naphthalate. Protrusions each having a height of 50 to 150 nm of 5000 pieces/mm or more are formed on at least one surface of the film, and a thickness of the film is formed to 50 to 100 μm. And, as polyester for constituting the surface layer, polyester having a crystallization parameter ΔTcg at lower than 60 deg.C is used. And, centerline mean roughness Ra of a surface having the protrusions is preferably 5 to 20 nm to allow high output and feeding durability to be compatible.
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公开(公告)号：JPH10198947A
公开(公告)日：1998-07-31
申请号：JP438897
申请日：1997-01-14
Applicant: TORAY INDUSTRIES
Inventor： NAKAMORI YUKARI , OKAMOTO KATSUYA , MIYAKE TORU
Abstract: PROBLEM TO BE SOLVED: To obtain a high-density magnetic recording medium that is excellent in traveling property accompanying increase in the speed of a process applying magnetic layer, shaving resistance, and the durability of a magnetic surface, free from omission of recording at the time of VTR picture recording and is preferably used for system apparatus material for outdoor picture recording where the traveling property and durability are particularly regarded more important than image quality, in a metal coating type magnetic recording medium having a magnetic layer of =2 layers of laminated constitution. The metallic coating type magnetic recording medium of a digital recording system having a total thickness below 6.3μm is formed by providing one surface of a biaxially oriented polyethylene-2,6-naphthalene film having a film thickness below 6μm with the magnetic layer having a thickness below 0.5μm. In such a case, the difference in the Young's modulus between the transverse direction and longitudinal direction of the film is specified to >=1.5GPa, the surface roughness of the outermost layers of both front and rear surfaces of the film is specified to >=0.015μm and the waving index is confined to
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公开(公告)号：JPH1052900A
公开(公告)日：1998-02-24
申请号：JP12234497
申请日：1997-05-13
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , MIYAKE TORU , NAKAMORI YUKARI
Abstract: PROBLEM TO BE SOLVED: To provide a biaxially oriented laminated polyester film for a magnetic recording medium having excellent output and feeding durability, further extremely small rough protrusion due to aggregated particles for causing dropout or head irregular wear and further excellent winding characteristics and slitting properties. SOLUTION: In the biaxially oriented laminated polyester film comprising at least three layers A, B, C, the layer A for constituting a side provided with a magnetic layer is formed of high crystallinity polyester film having a crystallinity parameter ΔTcg of less than 60 deg.C, the number of protrusions each having a height of a protrusion existing on a surface of the layer A from its flat surface exceeding 0.27μm is 2% or less of the entire number of the protrusions. Further, the layer C for constituting an opposite surface side is formed of polyester having crystallinity parameter ΔTc of 60C, contains 0.05 to 2.0wt.% of inert particles each having a mean particle size of 0.1 to 1.0μm, and further has a thickness of a laminated layer of 0.2 to 2.0μm.
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公开(公告)号：JPH09164641A
公开(公告)日：1997-06-24
申请号：JP32694995
申请日：1995-12-15
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , MIYAKE TORU , NAKAMORI YUKARI
IPC: C08J5/18 , B29C55/12 , B29K67/00 , B29K105/16 , B29L9/00 , B32B27/36 , C08K3/00 , C08K5/00 , C08L67/00 , G11B5/73 , G11B5/704
Abstract: PROBLEM TO BE SOLVED: To impart excellent thermal dimensional stability and tear resistance without damaging high mechanical strength capable of corresponding to the thickness reduction of a magnetic tape and to prevent the generation of a surface defect. SOLUTION: This film is a biaxially oriented film composed of polyethylene-2,6-naphthalate. The intrinsic viscosity of the whole of the film is below 0.54 and the sum of the Young's moduli in the longitudinal and lateral directions of the film is 14GPa or more and the sum of the heat shrinkage factors at a time of 150 deg./30min treatment in the longitudinal and lateral directions of the film is below 6.0% and the sum of the tear propagation resistances in the longitudinal and lateral directions of the film is set to 3.0N/min or more.
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公开(公告)号：JPH09131839A
公开(公告)日：1997-05-20
申请号：JP29284595
申请日：1995-11-10
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , MIYAKE TORU , NAKAMORI YUKARI
IPC: C08J5/18 , B29C55/12 , B29K67/00 , B29K105/16 , B29L9/00 , B32B27/36 , C08K3/00 , C08L67/00 , G11B5/66 , G11B5/73 , G11B5/733
Abstract: PROBLEM TO BE SOLVED: To provide output and running durability to a tape for digital recording and to decrease oligomer deposited on the surface by providing projections with specified height and density at least one face of a laminated polyester film with at least three layers and specifying the angle of contact to the water on the surface and the wholly reflecting Raman crystallization index. SOLUTION: For a biaxially oriented laminated polyester film with at least three layers, there exist at least 200 million/mm projections with a height of 10-50nm at least on one surface and the angle of contact to the water on the surface is 40-55 deg. and the wholly reflecting Raman crystallization index is at most 20cm . For forming the fine projections, 0.05-1.5wt.% inactive particles such as a colloidal silica to the whole wt. or the surface layer are incorporated in the surface layer. To make the angle of contact in a specified range, a metal sulfonate of the general formula CnH2n+1 -C6 H4 -SO3 M (wherein n=6-30 and M = an alkali metal or an alkali earth metal) is incorporated in the inner layer of a film and coextrusion is performed for the wholly reflecting Raman crystallization index.
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