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公开(公告)号：DE69329188D1
公开(公告)日：2000-09-14
申请号：DE69329188
申请日：1993-05-10
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , ABE KOICHI , NAKAJIMA SYOJI
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公开(公告)号：DE69227354T2
公开(公告)日：1999-05-06
申请号：DE69227354
申请日：1992-11-16
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , ABE KOICHI , NAKAJIMA SYOJI
Abstract: A biaxially oriented thermoplastic resin film suitable as a base film of a magnetic recording medium comprises a laminate having a layer A composed of a thermoplastic resin A containing particles on at least one surface of a layer B composed of a thermoplastic resin B. The film has a ratio t/d of the thickness of the layer A "t" to the mean diameter of the particles contained in the thermoplastic resin A "d" in the range 0.1 to 5, a number of protrusions having a diameter d1 of not less than 0.7 mu m and not more than 2.6 mu m among protrusions existing on the surface of the layer A in the range 100 to 10,000/mm and a ratio L/S of a number S of protrusions having a smaller diameter d2 (0.2 mu m
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公开(公告)号：CA2095901A1
公开(公告)日：1994-11-11
申请号：CA2095901
申请日：1993-05-10
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , ABE KOICHI , NAKAJIMA SHOJI
Abstract: Disclosed is a polyester film having a surface layer whose major component is polyester A. Protrusions are formed on the film surface originating from the crystallization of polyester A. The number of protrusions formed on the surface of the film is not less than 5 x 103/mm2, and the ratio N R of the number of protrusions to the number of particles contained in a surface layer forming the surface of the film is not less than 5. Since most of or the whole of the protrusions are formed by utilizing the crystallization of polyester A without relying particles, generation of voids can be prevented and fine and uniform protrusions having excellent chipping resistance and scratch resistance can be formed.
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公开(公告)号：DE60313063T2
公开(公告)日：2007-07-19
申请号：DE60313063
申请日：2003-02-24
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , FUKATA KAZUYOSHI
Abstract: The present invention provides a polyester film for magnetic recording media comprising a coating layer containing fine particles and organic compounds formed on surface A at one side of the polyester film, and fine surface protrusions are formed at a density of 3 x 10 to 1 x 10 porotrusions/mm on surface A. The polyester film satisfies at least one of the following conditions: (a) the mean diameter of the fine surface protrusions is in the range of 5 to 60 nm, and, among the fine surface protrusions, the density of fine surface protrusions with a height of 20 nm or more is 3,000 protrusions/mm2, and (b) the mean diameter of the fine surface protrusions is in the range of 5 to 100 nm, the mean height of the fine surface protrusions is in the range of 5 to 30 nm, and the degree of cohesion of the fine surface protrusion is less than 15%. The present invention also provides a magnetic recording tape that exerts a small amount of wear on an MR head, and thus good traveling durability and a low incidence of dropouts, and a polyester film for magnetic recording media that enables the magnetic tape to be produced.
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公开(公告)号：DE69327489D1
公开(公告)日：2000-02-10
申请号：DE69327489
申请日：1993-08-12
Applicant: TORAY INDUSTRIES
Inventor： OKAZAKI IWAO , KIMURA MASAHIRO , MASATOSHI AOYAMA , SUZUKI MASARU , ABE KOICHI , NAKAMORI YUKARI , MINAMIZAWA HIDEHITO , OKAMOTO KATSUYA , TANAKA HIROYUKI
Abstract: A biaxially oriented film and a laminated film contain organic particles at a content of 0.001 to 20% by weight. The strength when deformed by 10% (S10) of the organic particles is in the range of 3 to 30 kgf/mm and the thermal decomposition temperature for causing 10% loss in weight thereof is not lower than 350 DEG C. The weight average diameter thereof is in the range of 0.005 to 5 mu m. The film is particularly useful as a base film of a magnetic tape.
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Patent Agency Ranking
公开(公告)号：CA2103840A1
公开(公告)日：1994-02-13
申请号：CA2103840
申请日：1993-08-11
Applicant: TORAY INDUSTRIES
Inventor： OKAZAKI IWAO , KIMURA MASAHIRO , AOYAMA MASATOSHI , SUZUKI MASARU , ABE KOICHI , NAKAMORI YUKARI , MINAMIZAWA HIDEHITO , OKAMOTO KATSUYA , TANAKA HIROYUKI
Abstract: Disclosed is a biaxially oriented film and a laminated film containing specified organic particles at a content of 0.001 to 20% by weight. The strength when deformed by 10% (S10) of the organic particles is in the range of 3 to 30 kgf/mm2, the thermal decomposition temperature for causing 10% loss in weight thereof is not lower than 350 .degree.C . The weight average diameter thereof is in the range of 0.005 to 5 .mu. m. Since the organic particles have a good affinity with the matrix resin of the film and a good thermal resistance and the hardness of the particles is appropriate, desired protrusions hardly chipped and having an appropriate hardness for hardly scratching a magneticsurface can be formed on a film surface easily and uniformly. Therefore, a film excellent in abrasion resistance and scratch resistance at a high running speed and excellent in running durability can be obtained, which is useful particularly as a base film of a magnetic tape.
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公开(公告)号：DE60312253T2
公开(公告)日：2007-06-28
申请号：DE60312253
申请日：2003-05-27
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , FUKATA KAZUYOSHI
Abstract: A polyester film comprising a coating layer which comprises organic fine particles and organic compounds on one-side surface of the polyester film, the weight ratio of the organic fine particles to the organic compounds in the coating is 1:0.2 to 1:5.0, the diameters of surface protrusions on the coating surface are 20 to 60 nm, the number of surface protrusions on the surface of the coating layer is 3 million to 100 million per square millimeter, and the surface roughness Ra of the coating surface is 0.5 to 1.9 nm, is suitable as a base film of a recording medium having excellent image quality and excellent durability without shaving an MR head.
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公开(公告)号：DE69227354D1
公开(公告)日：1998-11-26
申请号：DE69227354
申请日：1992-11-16
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , ABE KOICHI , NAKAJIMA SYOJI
Abstract: A biaxially oriented thermoplastic resin film suitable as a base film of a magnetic recording medium comprises a laminate having a layer A composed of a thermoplastic resin A containing particles on at least one surface of a layer B composed of a thermoplastic resin B. The film has a ratio t/d of the thickness of the layer A "t" to the mean diameter of the particles contained in the thermoplastic resin A "d" in the range 0.1 to 5, a number of protrusions having a diameter d1 of not less than 0.7 mu m and not more than 2.6 mu m among protrusions existing on the surface of the layer A in the range 100 to 10,000/mm and a ratio L/S of a number S of protrusions having a smaller diameter d2 (0.2 mu m
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公开(公告)号：CA2083080A1
公开(公告)日：1993-05-19
申请号：CA2083080
申请日：1992-11-17
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , ABE KOICHI , NAKAJIMA SYOJI
Abstract: Disclosed is a biaxially oriented thermoplastic resin film formed by laminating a layer A composed of a thermoplastic resin A containing particles on at least one surface of a layer B composed of a thermoplastic resin B. The film has a specified ratio t/d of the thickness of the layer A "t" to the mean diameter of the particles contained in the thermoplastic resin A "d", a specified number of protrusions having a diameter of not less than 0.7.mu.m and not more than 2.6 .mu.m among protrusions existing on the surface of the layer A and a specified ratio L/S of a number S of protrusions having a smaller diameter to the number L of protrusions having a diameter in the above range. An excellent winding property when the film is wound and an excellent dubbing resistance when the film is used for a video tape can be obtained.
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公开(公告)号：DE60313063D1
公开(公告)日：2007-05-24
申请号：DE60313063
申请日：2003-02-24
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , FUKATA KAZUYOSHI
Abstract: The present invention provides a polyester film for magnetic recording media comprising a coating layer containing fine particles and organic compounds formed on surface A at one side of the polyester film, and fine surface protrusions are formed at a density of 3 x 10 to 1 x 10 porotrusions/mm on surface A. The polyester film satisfies at least one of the following conditions: (a) the mean diameter of the fine surface protrusions is in the range of 5 to 60 nm, and, among the fine surface protrusions, the density of fine surface protrusions with a height of 20 nm or more is 3,000 protrusions/mm2, and (b) the mean diameter of the fine surface protrusions is in the range of 5 to 100 nm, the mean height of the fine surface protrusions is in the range of 5 to 30 nm, and the degree of cohesion of the fine surface protrusion is less than 15%. The present invention also provides a magnetic recording tape that exerts a small amount of wear on an MR head, and thus good traveling durability and a low incidence of dropouts, and a polyester film for magnetic recording media that enables the magnetic tape to be produced.
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