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公开(公告)号：JPH08276493A
公开(公告)日：1996-10-22
申请号：JP1802096
申请日：1996-01-09
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , MINAMIZAWA HIDEHITO , TOYODA KATSUYA
IPC: B41M5/382 , B29C55/14 , B29K67/00 , B29L7/00 , B41M5/40 , B41M5/41 , C08J5/18 , G11B5/73 , H01G4/18 , G11B5/704
Abstract: PURPOSE: To stably supply a polyester film drastically enhanced in mechanical strength incapable of being achieved by conventional technique especially in its lateral direction. CONSTITUTION: A substantially amorphous polyester film is longitudinally stretched so that the double refraction (Δn) of the film becomes 0.002-0.02 and the degree of crystallization thereof becomes 10% or less and subsequently stretched laterally at temp. lower than longitudinal stretching temp.
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公开(公告)号：JP2530680B2
公开(公告)日：1996-09-04
申请号：JP2467988
申请日：1988-02-03
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO MINORU , MINAMIZAWA HIDEHITO
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公开(公告)号：JP2513727B2
公开(公告)日：1996-07-03
申请号：JP25546887
申请日：1987-10-08
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
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公开(公告)号：JPH08134231A
公开(公告)日：1996-05-28
申请号：JP27487194
申请日：1994-11-09
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , MINAMIZAWA HIDEHITO , TOYODA KATSUYA
Abstract: PURPOSE: To obtain a polyethylene naphthalate film having high rigidity and satisfactory thermal stability. CONSTITUTION: The film has a value of B of 0.07-0.31, provided that B=Eβ /Eα , wherein Eα is the maximum mechanical loss tangent, tanδ, of the main dispersion at around 175 deg.C and Eβ is that of the subdispersion at around 100 deg.C.
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公开(公告)号：JPH08103950A
公开(公告)日：1996-04-23
申请号：JP23901094
申请日：1994-10-03
Applicant: TORAY INDUSTRIES
Inventor： MINAMIZAWA HIDEHITO , TSUNASHIMA KENJI , TOYODA KATSUYA
Abstract: PURPOSE: To facilitate the longitudinal cutting while obtaining the lateral strength and to improve the characteristics of a final product of digital video tape by specifying the thickness of a film, the Young's modulus of the lateral direction of the film and the tear propagating velocity of the longitudinal direction of the film. CONSTITUTION: Regarding biaxially oriented polyester film, the thickness of the film is specified to 8μm or less, the Young's modulus of the lateral direction (TD) of the film is specified to 800kg/mm or more, and the tear propagating velocity of the longitudinal direction (MD) of the film is specified to 50-300g/mm. Two or more layers of the films are laminated, inactive particles are contained in the outermost layer of one side, the mean particle size of the particles is specified to 0.2μm or less, and the thickness of the outermost layer is specified to 0.1μm or less. Further, the quantity of germanium contained in the film is specified to the range of 0.005-0.03wt.% of the polymer. When pancake manufactured in this manner is observed from the direction (1), slitting properties can be improved like a sample 3 as compared with a sample 2.
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Patent Agency Ranking
公开(公告)号：JPH06279599A
公开(公告)日：1994-10-04
申请号：JP27304293
申请日：1993-10-04
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
Abstract: PURPOSE:To obtain a film excellent in scratch resistance which can withstand to severe service conditions as have recently been encountered. CONSTITUTION:A biaxially oriented polyester film contains 2 kinds of particles A and B, the contents of which in the film are 0.1 to 2wt.% and higher than 0.4 to 10wt.%, respectively. The particles A are one kind of particles selected from among alpha-alumina, gamma-alumina, delta-alumina, zirconia, titanium nitride and org. polymers and having an average particle size of 5 to 400nm. The particles B are one kind of particles selected from among silica, calcium carbonate, alumina, rutile titanium oxide and org. polymers and having an average particle size of 400 to 1,500nm.
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公开(公告)号：JPH06210721A
公开(公告)日：1994-08-02
申请号：JP516393
申请日：1993-01-14
Applicant: TORAY INDUSTRIES
Inventor： MINAMIZAWA HIDEHITO , ABE KOICHI
IPC: B29C55/12 , B29K67/00 , B29L7/00 , B29L9/00 , B32B27/20 , B32B27/36 , C08L67/03 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE:To highly dimensionally reconcile electromagnetic conversion characteristics and a tape edge damage when a polyester film is formed into a magnetic tape by adding particles to the outermost layer at least on a single side and setting the thickness of the outermost layer and the average particle size of the particles to specific relation and setting the Young's modulus of the film in the lateral direction thereof to a specific value. CONSTITUTION:Particles are added to the outermost layer at least on a single side and the relation between the thickness (t) of the outermost layer and the average particle size (d) of the particles is set to the range of 0.2 or more. Polyester films having these characteristics are sufficiently dried to be laminated using two or more extruders, two or more manifolds and a confluent block to form a non-stretched film which is, in turn, biaxially stretched. As preheating and stretching rolls, Teflon or silicone rolls are used in order to improve the surface smoothness of the film. Next, this film is heat- treated.
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公开(公告)号：JPH06198827A
公开(公告)日：1994-07-19
申请号：JP35862292
申请日：1992-12-28
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , MINAMIZAWA HIDEHITO
Abstract: PURPOSE:To develop excellent electromagnetic conversion characteristics when a polyester film is used as a magnetic recording medium by stably producing the polyester film while putting the high mechanical strength peculiar to polyethylene naphthalate to practical use without damaging lateral Young's modulus. CONSTITUTION:A biaxially oriented polyester film is based on polyethylene naphthalate with intrinsic viscosity of 0.6-0.9 and polyethylene terephthalate having intrinsic viscosity equal to or less than that of polyethylene naphthalate and characterized by that the content of polyethylene terephthalate is 0.05wt.%- below 0.5wt.% and lateral Young's modulus is 6.5 GPa or more.
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公开(公告)号：JPH06126828A
公开(公告)日：1994-05-10
申请号：JP30287092
申请日：1992-10-14
Applicant: TORAY INDUSTRIES
Inventor： MINAMIZAWA HIDEHITO , ABE KOICHI
IPC: B29C55/12 , B29K67/00 , B29L7/00 , B29L9/00 , B32B27/20 , B32B27/36 , C08L67/00 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE:To improve difficulty to receive damage of a tape edge in running of a tape as a magnetic tape by a method wherein high abrasion resistance which has been difficult to be realized as a conventional polyester film is enabled to be realized. CONSTITUTION:In a polyester film which has ethylene naphthalate consisting of a laminated structure of at least two layers as a main component, a crosslinked organic high polymer particle is contained in the most outer layer on at least one side. A relation between a layer thickness (t) and a mean particle size (d) of the particle is within a range of 0.2 .
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公开(公告)号：JPH05293939A
公开(公告)日：1993-11-09
申请号：JP12804392
申请日：1992-04-22
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , MINAMIZAWA HIDEHITO , OKAZAKI IWAO
IPC: B29C55/12 , B29K67/00 , B29L7/00 , B29L9/00 , B32B27/20 , B32B27/36 , C08L67/00 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE:To enhance the high speed cutting property of the surface of a film by adding specific particles to the outermost layer on the single surface side of a laminated structure consisting of three or more layers so as to satisfy the relation between a specific average particle size and the thickness of the outermost layer and also adding inorg. particles to an intermediate layer. CONSTITUTION:A laminated film is a polyester film having a laminated structure consisting of at least three or more layers formed by coextrusion and particles are added to at least the layer on the single surface side of the laminated structure. The relation between the average particle size d(nm) of particles and the thickness t(nm) of the layer is 0.2
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