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公开(公告)号：JPH04125810A
公开(公告)日：1992-04-27
申请号：JP24826390
申请日：1990-09-17
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
IPC: G11B5/706
Abstract: PURPOSE:To produce the film having excellent scratch resistance even during high-speed traveling by specifying the surface form (Rp/Ra ratio) of the nonmagnetic surface of the video tape and the curling characteristic of the tape to specific ranges. CONSTITUTION:The pellets formed by mixing the particle master pellets of polyethylene (PE) terephthalate contg. the particles and the pellets of the PE terephthalate contg. substantially no particles in such a manner that the content of the particles attains a prescribed ration are dried under a reduced pressure. These pellets are supplied to an extruder and are melt extruded and cooled to solidity, by which an unstretched film is formed. This film is stretched longitu dinally and is further stretched transversely. The stretched film is heat treated to obtain the biaxially oriented film. A magnetic coating material is applied on this film and is subjected to magnetic orientation. The coating is then dried. Further, the film is subjected to a calender treatment then to curing. The Rp/Ra ratio of the nonmagnetic surface is 4 to 20 at this time and the curling amt. is 0.05 to 1mm. The measurement of the scratch resistance reveals that the film satisfying the Rp/Ra ration and the curling characteristic is excellent in the scratching resistance as well even during the high-speed traveling.
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公开(公告)号：JPH02214734A
公开(公告)日：1990-08-27
申请号：JP3512089
申请日：1989-02-16
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
IPC: B29C55/12 , B29K67/00 , B29L7/00 , C08G63/18 , C08G63/78 , C08J5/18 , C08K3/22 , C08K7/00 , C08L67/00 , C08L67/02
Abstract: PURPOSE:To provide the subject film containing specific amounts of two specific kinds of particles, having excellent scratch resistance and abrasion resistance and suitable as a base film for magnetic tape, packaging film and film for various industrial materials. CONSTITUTION:The objective film contains two kinds of particles A and B. The particle A is selected from alpha-alumina, gamma-alumina, delta-alumina, zirconia, titanium nitride and organic polymer and has an average particle diameter of 5-400nm and its content in the film is 0.1-2wt.%. The particle B is selected from silica, calcium carbonate, alumina, rutile titania and organic polymer and has an average particle diameter of 400-1,500nm and its content in the film is 0.01-0.4wt.%. The difference between the cooling crystallization temperature and the glass transition point of the particle A is preferably
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公开(公告)号：JPH02185533A
公开(公告)日：1990-07-19
申请号：JP413189
申请日：1989-01-11
Applicant: TORAY INDUSTRIES
Inventor： NISHINO SATOSHI , FUKUYAMA TAKEO , ABE KOICHI
Abstract: PURPOSE:To improve scratch and scraping resistances by incorporating an alumina particle with a specified average degree of agglomeration in a biaxially oriented polyester film. CONSTITUTION:A polyester (e.g. polyethylene terephthalate) is compounded with 0.05-5wt.% alumina particle with a mean prim. particle diameter of 5-200nm and one or more crystal form selected from beta, gamma and delta types and, if necessary, an inert particle with a mean particle diameter of 0.1-1.5mum and a crystallization acceleration factor of 15 deg.C or lower. The compounded mixture is melt-extruded, cooled and solidified to obtain an undrawn film. Then, this film is drawn 4 to 5-fold in two or three stages in the longitudinal direction at 100-130 deg.C and then 3 to 4-fold in the transverse direction at 80-120 deg.C. If necessary, it is heat- treated at a const. length at 180-230 deg.C for 0.5-30sec to obtain the title film with an average degree of agglomeration of the alumina particles of 5-100.
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公开(公告)号：JPH01320135A
公开(公告)日：1989-12-26
申请号：JP15333788
申请日：1988-06-20
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
Abstract: PURPOSE:To improve scratch resistance, by a method wherein organic high- molecular particles are contained within a film and a relation between a surface parameter and the coefficient of friction and a single index of the particle are made so as to fall within specific range. CONSTITUTION:The title film is mainly comprised of a composition composed of polyester and inactive organic high-molecular particles whose temperature at the time of a loss in weight by 10% is at least 350 deg.C, possesses a single index of the particle of the inactive organic high-molecular particles of at least 0.5 and satisfies formulas I, II by a relation between the coefficient of friction Y of the film and a surface parameter (beta/sigma). Hereupon, sigma and beta are respectively standard deviation of a distribution of heights of the protrusions and mean flatness of the protrusions. Then the film is principally constituted of a structural unit selected out of polyester ethylene terephthalate, ethylene alpha,beta-bis(2- chlorphenoxy)ethane-4,4'-dicalboxylate, and ethylene 2,6-naphthalate units. With this construction, the film which is hard to be scraped off and hard to be injured even at running under a high temperature and high humidity can be obtained.
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公开(公告)号：JPH01241429A
公开(公告)日：1989-09-26
申请号：JP7041888
申请日：1988-03-23
Applicant: TORAY INDUSTRIES
Inventor： NISHINO SATOSHI , OKAZAKI IWAO , ABE KOICHI
Abstract: PURPOSE:To obtain a polyester film which is superior in wear resistance and running properties in spite of its smoothness, by a method wherein a relation between a height of a protrusion and the radius of curvature is specified in relation to the protrusion of at least half the number in the protrusions whose height is specific or higher. CONSTITUTION:A relation between a protrusion height hmum and the radius of curvature BETA mum of the top of the protrusion satisfies the following formula in relation to the protrusions of at least half the number in the protrusions whose height is at least 20nm, in a biaxially oriented polyester film containing an inactive particle, 0.1Xh . When an inactive particle is not contained, running properties of a polyester film becomes inferior. Silica is preferable as the inactive particle and colloidal silica is especially effective. Although a crystallization acceleration coefficient of the inactive particle is not limited especially, a range of 3-18 deg.C is effective. The particle diameter of the inactive particle is preferably 0.08-1.5mum and a variation coefficient of the particle is 1.0 or less. Wear resistance and running properties become far more favorable when content of the inactive particle is 0.01-2wt.%.
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Patent Agency Ranking
公开(公告)号：JPH01232021A
公开(公告)日：1989-09-18
申请号：JP15088888
申请日：1988-06-17
Applicant: TORAY INDUSTRIES
Inventor： NISHINO SATOSHI , MINAMIZAWA HIDEHITO , ABE KOICHI
Abstract: PURPOSE:To manufacture a polyester film of superior resistance to wear by specifying the density difference range between the film and contained particles, the range of average particle diameters of the particles and the content of them and the range of thickness direction refractive index respectively. CONSTITUTION:0.01-5wt.% of inactive particles of 0.08-3mum average particle diameter are included in a polyester such as polyethylene terephthalate or the like. Then, said polyester is dried, fed into an extruder and filtered with high accuracy, and then melt extruded out of a slit-shaped cap, cooled and solidified to manufacture a non-oriented film. Said non-oriented film is biaxially stretched and biaxially oriented to manufacture a polyester film having 0.65g/cm or less of density difference between the polyester film and inactive particles and 1.47-1.53 refractive index in the thickness direction. Affinity between inactive particles and polyester is enhanced by said process to generate special interaction and form surface projection effectively, while falling-off of particles is eliminated to enhance resistance to wear.
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公开(公告)号：JPS6447526A
公开(公告)日：1989-02-22
申请号：JP20480887
申请日：1987-08-18
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MIMURA TAKASHI
Abstract: PURPOSE:To keep slip properties and to obtain a film having excellent surface scraping resistance, by setting skin thickness of at least one face and the ratio of surface average roughness and skin thickness in a specific ranges. CONSTITUTION:Skin thickness (d) of at least one face and ratio (Ra/d) of film surface average roughness Ra(nm) and d(nm) of a biaxially oriented film whose main components are polyester and a composition comprising of internally deposited particles and/or inert particles, are in the ranges of 50-800nm and 0.03-0.3 respectively. In this film, if the skin thickness is smaller than the above described range, the scraping resistance becomes worse and if this is larger, the slip properties become worse. If the ratio Ra/d is smaller than the above described range, the slip properties become worse and if the ratio is larger, the scraping resistance becomes worse. These tendencies are not desirable. To prepare this film, pellets containing a specific polyester and inert particles and/or internally deposited particles are fed in a melt extruder after these pellets are sufficiently dried and extruded from a slit-shaped die into a sheet-shape, which is cooled and solidified on a casting roll to prepare an undrawn film, which is then oriented by means of biaxial drawing.
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公开(公告)号：JP2002141246A
公开(公告)日：2002-05-17
申请号：JP2000333029
申请日：2000-10-31
Applicant: TORAY INDUSTRIES
Inventor： HATAYAMA AKIRA , NISHINO SATOSHI , KAWASE HIROKO
Abstract: PROBLEM TO BE SOLVED: To provide a polyester film for a capacitor, which can especially obtain a film capacitor for surface mounting, having a small change in a capacitance due to a reflow soldering process and having a satisfactory insulating resistance, without changing the design of the capacitor and which is suitably used for a chip-type capacitor. SOLUTION: In the polyester film for the capacitor, the heat shrinkage percentage SMD(230) (%) at 230 deg.C of an MD and the heat shrinkage percentage STD(230) (%) at 230 deg.C of a TD lie within regions of expressions (1) -1.0
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公开(公告)号：JPH1064750A
公开(公告)日：1998-03-06
申请号：JP23975396
申请日：1996-08-21
Applicant: TORAY INDUSTRIES
Inventor： HATAYAMA AKIRA , KINOSHITA SHUICHI , NISHINO SATOSHI
IPC: H01G4/18
Abstract: PROBLEM TO BE SOLVED: To obtain a film capacitor excellent in heat-resistant and water vaporproof characteristic and property for winding element at the time of manufacturing. SOLUTION: A polyester film capacitor is obtained by alternately laminating or winding double-sided metalized films and laminated films. A primer layer is formed on at least one side of at least one out of the film whose both surfaces are metalized or the laminated film. Surface carboxylic acid concentration in the primer layer is at least 0.008, and static friction coefficient and dynamic friction coefficient between the metalized surfaces of the double-sided metalized film and the surface of the laminated film are at most 2.5.
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公开(公告)号：JP2576215B2
公开(公告)日：1997-01-29
申请号：JP31442288
申请日：1988-12-12
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
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