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公开(公告)号：JPH071695A
公开(公告)日：1995-01-06
申请号：JP10326894
申请日：1994-04-19
Applicant: TORAY INDUSTRIES
Inventor： NAKAJIMA SHOJI , TANAKA HIROYUKI , ABE KOICHI , OKAMOTO KATSUYA
Abstract: PURPOSE:To enhance the running properties and resistance to scratching of a film and obtain a good image quality in use for a magnetic recording medium by a method wherein a biaxially oriented film in use is obtained by laminating a layer mainly composed of a polyester A on one surface of a layer mainly composed of a polyester B. CONSTITUTION:In a biaxially oriented film obtained by laminating a layer A mainly composed of a polyester A on one surface of a layer B mainly composed of a polyester B, a center line average surface roughness difference DELTARa between both the surfaces of the film is not less than 0.005mum, 5X10 /mm or more projections are formed on the surface having a larger surface roughness Ra, and a projection/particle number ratio, i.e., a ratio of the number of projections to the number of particles contained in the layer A as a surface layer, is 5 or more. The kind of the polyester A is not particularly limited, but the crystallizing parameter DELTA Tcg of the polyester A is preferably 60 deg.C or lower.
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公开(公告)号：JPH071575A
公开(公告)日：1995-01-06
申请号：JP10326494
申请日：1994-04-19
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , ABE KOICHI , NAKAJIMA SHOJI
Abstract: PURPOSE:To obtain a polyester film capable of forming surface projections hard to destruct and having relatively low hardness, capable of preventing the cutting of a partner member such as a guide while enhancing the surface abrasion resistance itself to a large extent and ideal for various industrial uses. CONSTITUTION:A polyester film is a biaxially oriented film based on polyester A and characterized by that the number of projections of at least one surface thereof is 5X10 /mm or more and the ratio (NR) of the number of projections/ the number of particles being the ratio of the number of projections and the number of the particles contained in the surface layer on the film is 5 or more.
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公开(公告)号：JPH06325352A
公开(公告)日：1994-11-25
申请号：JP13402493
申请日：1993-05-11
Applicant: TORAY INDUSTRIES
Inventor： NAKAJIMA SHOJI , ABE KOICHI , OKAMOTO KATSUYA
Abstract: PURPOSE:To obtain excellent tracking durability and scratching resistance by forming a specified number or more of fine projections on the surface of a film. CONSTITUTION:At least, on one surface of a biaxially oriented polyester film essentially comprising polyester (A), fine projections are formed by the amt. of 5X10 number/mm by using crystallization of the polyester (A). The ratio of projection number/particle number (particles included in the surface layer which constitutes the surface) is specified to >=5 and Rt(center line average roughness)/Ra (max. height) is specified to
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公开(公告)号：JPH06320616A
公开(公告)日：1994-11-22
申请号：JP11166293
申请日：1993-05-13
Applicant: TORAY INDUSTRIES
Inventor： NAKAJIMA SHOJI , ABE KOICHI , OKAMOTO KATSUYA
Abstract: PURPOSE:To realize enhancement of projection strength and superior electromagnetic conversion characteristics. CONSTITUTION:In a biaxially oriented film mainly composed of a polyester A, part or all of the polyester A is made of a thermoplastic resin having a crystalline parameter DELTATcg higher than 70 deg.C, and a Rt/Ra ratio of Rt to a surface roughness Ra is 20 or less on at least one surface of the film.
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公开(公告)号：JPH06320614A
公开(公告)日：1994-11-22
申请号：JP11165993
申请日：1993-05-13
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , ABE KOICHI , NAKAJIMA SHOJI
Abstract: PURPOSE:To obtain both a wear resistance and a dust generation inhibiting effect in running a plastic roll. CONSTITUTION:In a biaxially oriented film mainly composed of a polyester A, part or all of the polyester A has a crystalline parameter DELTATcg of 40 up to below 70 deg.C, and a Rt/Ra ratio of Rt to a surface roughness Ra is 20 or less.
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Patent Agency Ranking
公开(公告)号：JPH05338023A
公开(公告)日：1993-12-21
申请号：JP17598892
申请日：1992-06-11
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , OKAMOTO KATSUYA , NAKAJIMA SHOJI
IPC: B29C55/12 , B29K67/00 , B29L7/00 , B29L9/00 , B32B27/20 , B32B27/36 , C08L67/02 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE:To provide a biaxially oriented polyester film for a magnetic recording medium, which is hard to curl while securing an excellent picture quality (S/N) which may be obtained in the case where the film is made into the magnetic recording medium. CONSTITUTION:A biaxially oriented polyester film is obtained by laminating a polyester composition A containing particles on at least one side of a polyester composition B, a ratio t/d between a mean particle diameter (d) of the particles contained in the polyester A layer and a thickness (t) of the polyester A layer satisfies 0.1 /%RH and a difference between the coefficients of humid expansion of the lengthwise and widthwise directions is not exceeding 4X10 %RH.
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公开(公告)号：JPH05318583A
公开(公告)日：1993-12-03
申请号：JP15005392
申请日：1992-05-19
Applicant: TORAY INDUSTRIES
Inventor： OKAMOTO KATSUYA , NAKAJIMA SHOJI , ABE KOICHI
IPC: B29C55/12 , B29K67/00 , B29L7/00 , B29L9/00 , B32B27/20 , B32B27/36 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE:To improve traveling properties and cutting resistance, to reduce a decrease in picture quality and to improve skew characteristics of a biaxially oriented laminated film by forming the film in a laminated structure of three or more layers, incorporating special particles in an outermost layer of its one side surface, and simultaneously processing means such as enhancing intrinsic viscosity of the outermost layer part. CONSTITUTION:A biaxially oriented laminated film is formed of a laminated structure of at least three or more layers. In this case, particles are contained at least in an outermost layer of its one side surface of the film. The relationship between a mean particle size (d) (mum) of the particle and a thickness(t) of the outermost layer is so set as to satisfy 0.2d -2X10 mm . Further, intrinsic viscosity of an intermediate layer is set to higher than that of the outermost layer part. Thus, fine protrusions on the surface of the film are optimized to improve traveling properties and cutting resistance, a decrease in picture quality at the time of using it as a magnetic medium is reduced, and its skew characteristics are improved.
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公开(公告)号：JPH05298672A
公开(公告)日：1993-11-12
申请号：JP12804292
申请日：1992-04-22
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , OKAMOTO KATSUYA , NAKAJIMA SHOJI
Abstract: PURPOSE:To prevent the generation of tape hiss while maintaining excellent characteristics as a magnetic tape by imparting a laminated structure consisting of two or more layers to a base film, incorporating particles into a layer of the base film opposite to the magnetic face to satisfy specified relation between the average particle diameter of the particles and the thickness of the outermost layer and specifying the thermal shrinkage of the base film in the longitudinal direction. CONSTITUTION:When a base film is coated with a magnetic layer to obtain a magnetic tape, a polyester film having a laminated structure consisting of two or more coextruded layers and having 0.5-2% thermal shrinkage at 80 deg.C in the longitudinal direction is used as the base film. The polyester film contains particles in a layer opposite to the magnetic face and the relation between the average particle diameter (d) (nm) of the particles and the thickness (t) (nm) of the outermost layer satisfies 0.2
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公开(公告)号：JPH04259548A
公开(公告)日：1992-09-16
申请号：JP4072291
申请日：1991-02-14
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NAKAJIMA SHOJI , OKAMOTO KATSUYA
Abstract: PURPOSE:To improve the coiling and output properties of this polyester film by limiting the relationship between the layer thickness and average particle diameter of polyester A containing particles and the content of particles within specific threshold values and forming the surface of the layer B side so that it has a specific surface formation. CONSTITUTION:This biaxially oriented film consists of polyester A containing 2 to 20wt.% of at least, one type of particle laminated on the one surface of polyester B. The ratio t/d of the thickness(t) of polyester A and the average particle diameter(d) contained in the polyester A layer is 0.1 to 2.5. The polyester B layer contains 0.1 to 1.5wt.% of particles with an average particle diameter of 0.1d to 2d. Polyesters A, B are not particularly defined and the crystalline type of polyester is used from a viewpoint of coiling and output properties. Particles in the polyester A layer are not particularly defined, and alumina silicate and silica particles are used. The size of the particles averages 0.03 to 1.5mum in diameter.
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公开(公告)号：JP2003242628A
公开(公告)日：2003-08-29
申请号：JP2002038276
申请日：2002-02-15
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 which is little in the number of pieces of DOs even in the case of reproduction with a DVC camera and video decks different from the DVC camera recorded with pictures in an LP mode and has excellent traveling durability, more particularly a magnetic recording medium adequate for manufacturing DVC-LP tapes at a good yield. SOLUTION: The polyester film for the magnetic recording medium which is a polyester film for the magnetic recording medium having a thin ferromagnetic metallic film layer, in which the cubic unevenness (R1) of the film thickness expressed by the following equation (1) is ≤0.30 in the measured value in the longitudinal direction of the film. R1=d 3 ×(1/dmin 3 -1/dmax 3 )...(1) (in the equation (1), (d), dmax and dmin are respectively the mean thickness (μm), maximum thickness (μm) and minimum thickness (μm) between the length 50 cm of the polyester film. COPYRIGHT: (C)2003,JPO
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