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公开(公告)号：DE602004015730D1
公开(公告)日：2008-09-25
申请号：DE602004015730
申请日：2004-02-04
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , FUKATA KAZUYOSHI , YAGI MASAHIRO
Abstract: A polyester film for recording medium, having one major surface thereof provided with a coating layer containing fine particles of 5 to 60 nm diameter and an organic compound, wherein the number of fine surface projections existing on the surface of the coating layer is in the range of 3 million to 100 million/mm , and the number of surface defects of 120 nm or greater height attributed to foreign matter contained in the film is 30/100 cm or less, and wherein the polyester contains a titanium compound substantially not having any particle diameter. Thus, there are provided a magnetic recording tape for digital data recording that can reduce dropouts and excels in durability, and further provided a polyester film that is suitable as a base film thereof.
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公开(公告)号：DE3382633T2
公开(公告)日：1993-04-01
申请号：DE3382633
申请日：1983-11-01
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , MOTEGI MASAHIKO , OKABE KAZUO
IPC: B32B3/14 , B32B5/16 , B32B27/36 , C08L67/02 , G11B5/00 , G11B5/73 , G11B5/733 , G11B5/704 , C08J7/04
Abstract: A thermoplastic resin base film for a magnetic recording medium includes a thermoplastic resin film (1) and a discontinuous film (2) adhering closely to at least one surface of the thermoplastic resin film (1). The discontinuous film (2) has a thickness of not larger than 0.05µm and is composed of a polymer blend containing fine particles (3). The polymer blend comprises a water-soluble polyester copolymer and a water-soluble polymer having at least one hydroxyl group in the recurring unitthereof. Fine protrusions are formed on the discontinuous film due to the presence of the fine particles therein. A magnetic recording medium using the base film is suitable for high density magnetic recording and has extremely excellent durability to repeated use.
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公开(公告)号：DE3378284D1
公开(公告)日：1988-11-24
申请号：DE3378284
申请日：1983-11-01
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , MOTEGI MASAHIKO , OKABE KAZUO
Abstract: A thermoplastic resin base film for a magnetic recording medium includes a thermoplastic resin film (1) and a discontinuous film (2) adhering closely to at least one surface of the thermoplastic resin film (1). The discontinuous film (2) has a thickness of not larger than 0.05µm and is composed of a polymer blend containing fine particles (3). The polymer blend comprises a water-soluble polyester copolymer and a water-soluble polymer having at least one hydroxyl group in the recurring unitthereof. Fine protrusions are formed on the discontinuous film due to the presence of the fine particles therein. A magnetic recording medium using the base film is suitable for high density magnetic recording and has extremely excellent durability to repeated use.
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公开(公告)号：DE3560497D1
公开(公告)日：1987-09-24
申请号：DE3560497
申请日：1985-02-25
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , MOTEGI MASAHIKO , OKABE KAZUO
Abstract: A thermoplastic resin base film for a magnetic recording medium includes a thermoplastic resin film (1) and a discontinuous film (2) adhering closely to at least one surface of the thermoplastic resin film (1). The discontinuous film (2) has a thickness of not larger than 0.05µm and is composed of a polymer blend containing fine particles (3). The polymer blend comprises a water-soluble polyester copolymer and a water-soluble polymer having at least one hydroxyl group in the recurring unitthereof. Fine protrusions are formed on the discontinuous film due to the presence of the fine particles therein. A magnetic recording medium using the base film is suitable for high density magnetic recording and has extremely excellent durability to repeated use.
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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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Patent Agency Ranking
公开(公告)号：DE60312253D1
公开(公告)日：2007-04-19
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：DE69032002T2
公开(公告)日：1998-07-23
申请号：DE69032002
申请日：1990-09-25
Applicant: TORAY INDUSTRIES
Inventor： MORITA TOHRU , NAGAHAMA AKIHIKO , UEDA TOSHIAKI , ONO MASAAKI
Abstract: A composite polyester film comprising a major layer and a minor layer composed of a polyester having a melt resistivity of less than 5 x 10 OMEGA .cm and lower than that of a polyester constituting the major layer and a thickness of 1/200 to 4/10 of the thickness of the composite film as a whole. The film exhibits excellent electrostatic castability and heat stability.
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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：DE3884549T2
公开(公告)日：1994-05-11
申请号：DE3884549
申请日：1988-05-02
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , IZASA TAKAO , OKABE KAZUO
IPC: B29C55/12 , B32B27/36 , C08G63/85 , C08G63/86 , C08J5/18 , C08J7/04 , G11B5/66 , G11B5/73 , G11B5/704
Abstract: Polyester film for use as a base for magnetic recording medium is prepd. from a polyester obtd. using a germanium cpd. as polymerisation catalyst, and has Young's modulus in the longitudinal direction (Emd) at least 350 kg/square mm; Young"s modulus in the transverse direction (Etd) at least 350 kg/mm2; Emd.Etd at least 250,000 square kg/mm; refractive index (nzd) across the thickness of the film at least 1.480 and not more than 1.492. The max. surface roughness (Rt) on at least one side surface is no more than 100 nm. The film may be a laminate of two films both satisfying the above criteria, in which case one film may contain fine particles and pref. has Rt no less than 30 nm.
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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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