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公开(公告)号：DE3167964D1
公开(公告)日：1985-02-07
申请号：DE3167964
申请日：1981-09-24
Applicant: TORAY INDUSTRIES
Inventor： KAZAMA TAKAHIKO , FUJITA SABURO , OKAMURA YUJI
Abstract: A biaxially oriented polyester film which is well balanced between sliding properties and transparency and having an enhanced uniformity in thickness is prepared by a process wherein a polyester, predominantly comprised of polyethylene terephthalate, is extruded into a sheet form extrudate; the extrudate is quenched to a temperature of below Tg to obtain a solidified, substantially amorphous film; the film is drawn in the longitudinal direction at a drawing ratio of larger than 2.4 but smaller than 6.5; the film is quenched; and then, the film is drawn in the transverse direction at a drawing ratio of at least 2.5. The drawing in the longitudinal direction is carried out in two steps wherein: (i) in the first drawing step, the substantially amorphous film is drawn in one or more stages at a total drawing zone length (l1) of at least 50 mm so that the resulting polyester film possesses a birefringence of 1x10-3 to 12x10-3; (ii) the drawn film is kept, without being quenched to a temperature of not higher than the Tg, in contact with a roll maintained at 100 DEG to 130 DEG C.; and then, (iii) in the second drawing step, the film is drawn at a drawing ratio of larger than 1.6 but smaller than 2.7 in one stage at a drawing zone length of shorter than l1/2.
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公开(公告)号：JPH08193138A
公开(公告)日：1996-07-30
申请号：JP648995
申请日：1995-01-19
Applicant: TORAY INDUSTRIES
Inventor： OKUBO KENICHI , OKAMURA YUJI
IPC: B05D7/04 , B05D7/24 , B29C55/12 , B29K67/00 , B29L9/00 , B32B27/16 , B32B27/36 , C08J5/18 , C08J7/00 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE: To obtain a polyester film used for a digital video tape, excellent in adhesion to a magnetic layer and having good traveling characteristics and a high modulus of elasticity. CONSTITUTION: A film for a magnetic recording medium, which consists mainly of a polyester and has Young's moduli in the longitudinal and transverse directions, respectively of at least 400kg/mm and at least 800kg/mm , a centerline surface roughness RaA on one side (A side) of 5-30nm and a centerline surface roughness RaB on the other side (B side) of at most 10nm and of which at least B side has an angle of contact with water of at most 70 deg..
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公开(公告)号：JPH07241962A
公开(公告)日：1995-09-19
申请号：JP3244694
申请日：1994-03-02
Applicant: TORAY INDUSTRIES
Inventor： TAMADA KAZUSHI , HIRATA JUN , OKAMURA YUJI
Abstract: PURPOSE:To provide a laminated film free from faults and excellent in smoothness, shaving resistance and durable running properties and suitable for a magnetic tape. CONSTITUTION:A film layer containing particles with an average particle diameter of 0.03-0.13mum of which the exteriors are softer than the interiors is provided on at least the single surface of a base film based on a thermoplastic resin.
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公开(公告)号：JPH06286089A
公开(公告)日：1994-10-11
申请号：JP10368493
申请日：1993-04-07
Applicant: TORAY INDUSTRIES
Inventor： OKAMURA YUJI , OKUBO KENICHI , HARADA SUNAO
IPC: B29C55/12 , B29K67/00 , B29L9/00 , B32B27/36 , C08J7/04 , C08L67/03 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE:To perform higher density recording by utilizing high picture quality of a metal thin film magnetic recording medium and high strength, high heat resistant characteristics of fundamental characteristics of polyethylene-2,6- naphthalate. CONSTITUTION:A biaxially oriented composite film has a layer A made of polyethylene-2,6-naphthalate containing germanium compound and magnesium compound, and a layer B made of polyethylene-2,6-naphthalate containing inactive solid fine particles and laminated on the layer A. The layer A is covered with a coating film in which a discontinuous film or fine particles having a mean particle size of 3nm or more or both exist in such a manner that its surface roughness is 5nm or less. The layer B is formed of polyethylene-2,6- naphthalate containing 0.001-1wt.% of particles having mean particle size of 0.1-0.5mum and a biaxially oriented composite polyethylene naphthalate film for a metal thin film magnetic recording medium has a surface having surface roughness of 25nm or less.
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公开(公告)号：JPH08212536A
公开(公告)日：1996-08-20
申请号：JP3899395
申请日：1995-02-03
Applicant: TORAY INDUSTRIES
Inventor： OKUBO KENICHI , OKAMURA YUJI
Abstract: PURPOSE: To obtain a polyester film less in dropout and fit for a digital video tape by preparing a superior laminated film excellent in running performance, having satisfactory wear resistance of protrusions and free from surface defects. CONSTITUTION: This film is a film made chiefly of polyester and a group of fine protrusions made chiefly of a low mol.wt. body of the polyester exist on a face of the film on which a magnetic layer is formed. The peak height (h) (nm) of the fine protrusions each having 1-10μm major axis size and the number of the fine protrusions. A (per 100cm ) as follows; h>=0.27 and A 0.54 and A 0.81 and A 1.08 and A
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Patent Agency Ranking
公开(公告)号：JPS63162215A
公开(公告)日：1988-07-05
申请号：JP30868186
申请日：1986-12-26
Applicant: TORAY INDUSTRIES
Inventor： OKAMURA YUJI , SUGIURA SEIYA , SATO KIMIO
Abstract: PURPOSE:To reduce thickness unevenness of a thermoplastic resin film, by reducing a sound wave which causes the thickness unevenness in the neighborhood of a nozzle when the thermoplastic resin film is prepared. CONSTITUTION:An undrawn film is obtained by heating and melting a thermoplastic resin above the m.p., extruding it from a nozzle into a film-shape and charging preferably an electrostatic charge on the film to tightly adhere it on a cooling drum. It is essential to keep a level of a sound pressure at a definite value or less in the neighborhood of the nozzle, when this undrawn film is prepared. Namely, the film preparation is carried out in such a condition that every sound pressure level of 1/3 octave central frequency is kept at 75dB or lower for the sound at 50Hz or lower, every sound pressure level of 1/3 octave central frequency is kept at 80dB or lower for the sound in the range of 50Hz-200Hz, and every sound pressure level of 1/3 octave central frequency is kept at 85dB or lower for the sound in the range of 200Hz-1,000Hz, thereby to obtain a thermoplastic resin film having less uneven thickness.
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公开(公告)号：JPH08193137A
公开(公告)日：1996-07-30
申请号：JP564895
申请日：1995-01-18
Applicant: TORAY INDUSTRIES
Inventor： OKUBO KENICHI , OKAMURA YUJI
Abstract: PURPOSE: To obtain a metallized polyester video film which has good cupping properties and good traveling characteristics and is free from heat deterioration in the vacuum deposition step. CONSTITUTION: This polyester film for a magnetic recording medium, which has a centerline surface roughness RaA of 0.005-0.030μm at least on one side and of which the breadthwise heat shrinkage S(%) and the breadthwise heat shrinkage stress F (kg/mm ) satisfy the relations of the formulas -0.1
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公开(公告)号：JPH08161725A
公开(公告)日：1996-06-21
申请号：JP29985794
申请日：1994-12-02
Applicant: TORAY INDUSTRIES
Inventor： OKUBO KENICHI , OKAMURA YUJI
Abstract: PURPOSE: To obtain a film for a magnetic recording medium ideal for a tape for digital video which achieves a higher elastic modulus across the width thereof and also a sufficient elastic modulus along the length thereof by applying a non-magnetic metal layer to a polyester film. CONSTITUTION: This film for a magnetic recording medium has a non-magnetic metal layer applied on at least one surface of a base film mainly comprising a polyester film. The Young modulus along the length of the film is 500Kg/mm or more and the Young modulus across the width thereof 1,000Kg/mm or more.
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9.发明专利
公开(公告)号：JPH06285973A
公开(公告)日：1994-10-11
申请号：JP10368593
申请日：1993-04-07
Applicant: TORAY INDUSTRIES
Inventor： OKAMURA YUJI , OKUBO KENICHI , FUKADA KAZUYOSHI
Abstract: PURPOSE:To improve handling property, running property and durability and also basic characteristics such as high strength, high heat resistance, etc., and thereby to attain higher-density recording by using a biaxially oriented composite film which is constructed of layers A and B having different structures and different average particle sizes, etc. CONSTITUTION:A biaxially oriented composite film prepared by laminating a layer A constituted of polyethylene-2,6-naphthalate containing a germanium compound or the like and a layer B containing inactive particulates. The layer A has a surface structure having a wind-wrought pattern, contains the inactive particulates of an average particle size (x:mum) less than 0.3mum in the amount (y:wt.%) of addition satisfying y
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公开(公告)号：JPH08147672A
公开(公告)日：1996-06-07
申请号：JP28498794
申请日：1994-11-18
Applicant: TORAY INDUSTRIES
Inventor： OKUBO KENICHI , OKAMURA YUJI , TAKAUCHI SHINJI
IPC: C08J5/18 , B29C55/12 , B29K67/00 , B29K105/16 , B32B27/36 , B32B33/00 , C08K9/04 , C08L67/00 , C08L67/02 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE: To obtain a polyethylene-2,6-naphthalate film for digital video tapes which shows superior running properties, good abrasion resistance at projections thereof and also superior properties without defects at the surface thereof. CONSTITUTION: This is a film for magnetic recording media mainly comprising polyethylene-2,6-naphthalate, containing organic high-molecular particles of an average particle size of 10-500nm and/or inorganic particles processed at the surfaces thereof through an organic high-molecular treatment. The ratio of the average height of surface projections and the average size of the particles is 1/6-1/2 at least at one surface of the medium. Moreover, a surface roughness RaA on a center line of one face (A side) is 5-30nm and a surface roughness RaB on a center line of the other face (B side) is 10nm or smaller.
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