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公开(公告)号：JP2002173270A
公开(公告)日：2002-06-21
申请号：JP2000374169
申请日：2000-12-08
Applicant: TORAY INDUSTRIES
Inventor： FUKADA KAZUYOSHI , ONO MASAAKI , OKAMOTO KATSUYA
IPC: B65D85/672 , B65D65/40 , B65D81/26 , B65H75/38
Abstract: PROBLEM TO BE SOLVED: To provide a polyester film roll wrapping body effective for producing a DVC tape with high productivity even when the polyester film wound in a roll is long or the polyester film wound in the roll is used in a humid season, namely from the rainy season to the summer season. SOLUTION: This polyester film roll wrapping body for the magnetic recording medium produced by wrapping the polyester film roll is constituted by the polyester film roll for the magnetic recording medium, which is wound around a cylindrical core; a cover film A wound around the polyester film roll so as to cover the whole width of the polyester film roll thereof; a dehumidification agent B provided thereon in an amount of 150 g or more per 10,000 m2 of a winding area of the polyester film and exhibiting the dehumidification efficiency of 60% ore more (the dehumidification efficiency after one day under the temperature 40 deg.C and 90% RH atmosphere); and a film tube C for covering whole of the outer periphery by banding both ends thereof and exhibiting a lower water vapor permeability than the cover film A.
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公开(公告)号：JP2002050033A
公开(公告)日：2002-02-15
申请号：JP2000230658
申请日：2000-07-31
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , FUKADA KAZUYOSHI
Abstract: PROBLEM TO BE SOLVED: To produce a polyester film for a magnetic recording medium suitable for use in the production of a tape for mass data storage having a low error rate. SOLUTION: An aqueous solution containing a water-soluble polymer and fine particles having 5-50 nm average particle diameter as essential components is applied to the surface A of a polyester film melt-extruded, cooled and drawn in one direction at 3-1,000 mg/m2 solid concentration. The polyester film is drawn in a direction perpendicular to the above drawing direction after or while drying the aqueous solution and then the film is heat-treated to produce the objective polyester film for a magnetic recording medium with the surface A side as a ferromagnetic metallic thin film forming face. When the average particle diameter of the fine particles is represented by d (nm), the thickness of a solid material formed by applying the aqueous solution by t (mn) and the draw ratio in the perpendicular direction by s (times), the relation of d/2
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公开(公告)号：JP2001256636A
公开(公告)日：2001-09-21
申请号：JP2000064849
申请日：2000-03-09
Applicant: TORAY INDUSTRIES
Inventor： FUKADA KAZUYOSHI , ONO MASAAKI , OKAMOTO KATSUYA
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium, using a polyester film having satisfactory productivity which causes little dropout, even when the medium is reproduced after stored for a long time and which has superior data storage performance for digital recording by a helical scanning method such as a DVC-LP tape. SOLUTION: A polyester film having 2 to 5 μm thickness, 2 to 5 nm SRa on one surface A, 0.4 to 0.9% heat shrinkage in both the longitudinal and the width directions at 100 deg.C for 30 minutes and 0.2% or lower as difference of the shrinkage between the longitudinal direction and the width direction is used as the base film. The magnetic recording medium is obtained, by forming a reinforcing film consisting of a metal material selected from metals, metalloids, alloys, oxides or composite materials of these on at least the other surface B of the film and forming a magnetic layer consisting of a ferromagnetic metal thin film on the surface A.
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公开(公告)号：JP2001236633A
公开(公告)日：2001-08-31
申请号：JP2000042484
申请日：2000-02-21
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , HATANO HIROSHI
Abstract: PROBLEM TO BE SOLVED: To provide a polyester film for a magnetic recording medium suitable for use in the production of a digital video tape having a small number of DO with good productivity. SOLUTION: The polyester film has fine surface projections due to fine particles on one surface A, the number of the fine surface projections is 3,000,000-90,000,000/mm2, the particle diameter of the fine particles is 10-50 nm and the number of charged recess-shaped present in the surface A is
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公开(公告)号：JP2001184623A
公开(公告)日：2001-07-06
申请号：JP36643999
申请日：1999-12-24
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , MORIMOTO TSUTOMU
Abstract: PROBLEM TO BE SOLVED: To produce a magnetic tap having good storage property at high temperature, little production of DO(dropout) and excellent electromagnetic conversion characteristics without causing blocking in the film ends when the base film is processed. SOLUTION: The polyester film for a magnetic recording medium consists of a plurality of laminated polyester layers A, B, and the polyester layer B contains 0.05 to 1.0 wt.% of wax and/or soap and 0.001 to 0.10 wt.% of a silicone compound and/or fluorine compound. Further, a ferromagnetic metal thin film layer is applied on the outer surface of the polyester film in the polyester layer A side and a back coating layer is applied on the outer surface of the polyester layer B to produce the magnetic tape.
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Patent Agency Ranking
公开(公告)号：JP2000251246A
公开(公告)日：2000-09-14
申请号：JP5388299
申请日：1999-03-02
Applicant: TORAY INDUSTRIES
Inventor： HATANO HIROSHI , OKAMOTO KATSUYA , ONO MASAAKI
Abstract: PROBLEM TO BE SOLVED: To form a polyester film for magnetic recording media, suited for manufacturing digital video tapes with less dropouts at a good workability. SOLUTION: A polyester film for magnetic recording media has an SRa of 2-5 nm and an SRz of 10-40 nm on one surface A, no easy-slidable cover layer formed by coating exists on another surface B, and its water drop contact angle is 62-86 deg.. A magnetic recording tape has a ferromagnetic metal film layer formed on the one surface A of the polyester film.
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公开(公告)号：JPH09220796A
公开(公告)日：1997-08-26
申请号：JP5390196
申请日：1996-02-16
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , MIYAKE TORU , ABE KOICHI
Abstract: PROBLEM TO BE SOLVED: To correspond to the thickness reduction of a tape by reconciling excellent output characteristics, the running durability of a magnetic surface and reduced drop out and imparting excellent mechanical strength. SOLUTION: In a laminated polyester film having at least three layers consisting of an inner layer and surface layers, the layer constituting the uppermost surface layer consists of polyethylene 2,6-naphthalate and inert particles. The layer adjacent to at least one uppermost surface layer is composed of polyester containing 30-80wt.% of an ethylene-2,6-naphthalate component and the thickness of said layer occupies 10-40% of the whole thickness of the film.
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公开(公告)号：JPH0890648A
公开(公告)日：1996-04-09
申请号：JP23350294
申请日：1994-09-28
Applicant: TORAY INDUSTRIES
Inventor： OKAZAKI IWAO , OKAMOTO KATSUYA , ABE KOICHI
IPC: C08J5/18 , B29C55/00 , B29K67/00 , B29L9/00 , B32B5/16 , B32B27/36 , B32B33/00 , G11B5/66 , G11B5/73 , G11B5/733
Abstract: PURPOSE: To endure sufficiently diversification of hardening method of a mag netic layer for a magnetic recording medium by improving back force properties, by a method wherein light transmittance, the lateral modulas of elasticity and a thickness of a film are specified. CONSTITUTION: In a film comprised of polyethylene 2,6-naphthalene dicarboxylate, light transmittance at a wave length of 550nm and 250nm is taken respectively as at least 70% and not exceeding 10% in terms of film thickness of 10μm. Then the lateral modulus of elasticity and a film thickness are taken respectively as at least 700kg/mm and not exceeding 7μm. Then the film is comprised of at least two layer structure of layers A, B and the thickness of the layer A may be 0.01-3.0μm. Further it is preferable that the layer A and/or the B are the polyethylene 2,6-naphthalene dicarboxylate. It is preferable further that the layer A contains 0.01-3.0wt.% particles having a mean particle diameter of 0.01-1.0μm.
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公开(公告)号：JPH0830958A
公开(公告)日：1996-02-02
申请号：JP11212395
申请日：1995-05-10
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , ABE KOICHI , OKAZAKI IWAO
IPC: B32B27/20 , B29C55/12 , B29K67/00 , B29K105/16 , B29L9/00 , B29L31/34 , B32B27/36 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE:To obtain a polyester film capable of ensuring superior output characteristics and superior running durability of a magnetic face as a film for a metallic thin film type magnetic recording medium especially requiring high performance by imparting a laminated structure to a film for a magnetic recording medium and regulating the particle content of a layer of the film, the relation between the thickness of the layer and the particle diameter, and the distribution of height of protrusions. CONSTITUTION:This laminated polyester film consists of at least two layers A, B. The ratio of the thickness t mum of the top layer A of this film to the average particle diameter d mum of inert particles contained in the layer A is 0.5-20 and the particle content of the layer A is 0.02-1.5wt.%. The number of protrusions each having >0.035mum height from a flat face is .
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公开(公告)号：JPH07272249A
公开(公告)日：1995-10-20
申请号：JP6132994
申请日：1994-03-30
Applicant: TORAY INDUSTRIES
Inventor： OKAZAKI IWAO , ABE KOICHI , OKAMOTO KATSUYA
IPC: B32B27/00 , B29C55/12 , B29K67/00 , B29K105/16 , B29L9/00 , B32B27/20 , B32B27/36 , G11B5/73 , G11B5/704
Abstract: PURPOSE:To obtain a biaxially oriented film capable of ensuring superior output characteristics and capable of well withstanding long term recording even in the case of a reduced thickness by imparting a laminated structure to a film, regulating the particle content of a layer and the relation between the thickness of the layer and the particle diameter of particles in the layer and further regulating the surface roughness of the layer and the number of protrusions on the layer. CONSTITUTION:This biaxially oriented film has a laminated structure consisting of at least two layers A, B. The thickness of the layer A is 0.01-0.5mum, the layer A contains 0.05-2.0wt.% particles having 0.01-0.3mum average particle diameter and the relation between the average particle diameter (d) (nm) of the particles and the thickness (t) (nm) of the layer A is represented by 0.2d . The thickness of this film is
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