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公开(公告)号：JP2001039590A
公开(公告)日：2001-02-13
申请号：JP21353899
申请日：1999-07-28
Applicant: TORAY INDUSTRIES
Inventor： SUMIYA TAKASHI , SATO KIMIO , OTA TSUYOSHI
Abstract: PROBLEM TO BE SOLVED: To prevent flaw or foreign-matter-engagement from occurring in a winding process and to provide good winding quality, by winding a film that does not substantially contain any particle with average grain size more than a specific value, with specific bearing and tension, under an atmosphere where content of dust having a specific grain size is a specific value. SOLUTION: For winding a polyester-based film adequate for a floppy disk, the film with thickness from 0.1 to 500 μm that does not substantially contain any particle with average grain size more than 3 μm with 1-100 kg/m bearing and 5-150 kg/m tension under an atmosphere where content of dust having 2 μm or more grain size is less than 5000/ft3, preferably less than 500/ft3. Additionally, preferably, an average face roughness of at leant one surface of the polyester-based film is less than 50 nm. The film surface is coated with water soluble or water dispersible resin such as acryl-base or polyester-base as a coating agent.
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公开(公告)号：JP2000211021A
公开(公告)日：2000-08-02
申请号：JP1200699
申请日：1999-01-20
Applicant: TORAY INDUSTRIES
Inventor： SUMIYA TAKASHI , OTA TSUYOSHI , SATO KIMIO
Abstract: PROBLEM TO BE SOLVED: To provide a method for preparing a film wherein defects on the film surface such as damages generated in longitudinal drawing can be prevented from increasing with time. SOLUTION: A method for preparing a polyester film wherein a polyester film containing substantially no inorganic particle with a particle diameter of at least 3 μm with a thickness of at least 1 μm and at most 10 μm is drawn in the longitudinal direction by a draw ratio of 1.12-8 under an atmosphere with dust with a particle diameter of at least 2 μm of at most 5,000/ft3 and a high capacity floppy disc and an optical film using it, are provided.
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公开(公告)号：JPH0883420A
公开(公告)日：1996-03-26
申请号：JP21739994
申请日：1994-09-12
Applicant: TORAY INDUSTRIES
Inventor： HAGIWARA IKUO , OTA TSUYOSHI
Abstract: PURPOSE: To remarkably improve scraping resistance and handleability in a process for producing a tape using a film having
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公开(公告)号：JPH07266416A
公开(公告)日：1995-10-17
申请号：JP6503094
申请日：1994-04-01
Applicant: TORAY INDUSTRIES
Inventor： TERAMOTO MASAYUKI , KUNO MASAMI , OTA TSUYOSHI
Abstract: PURPOSE:To prevent occurrence of a curl attendant on a habit of winding to improve a flatness by setting a difference of a birefringence ratio between the top and rear surface of a film to a specific value. CONSTITUTION:A difference of a birefringence ratio (DELTAn) between the top and rear surface of a film is set to be not less than 3X10 . By winding the film with the surface of a small birefringence ratio inside, the film can be flat without a habit of winding in the longitudinal direction of the film at the time of secondary processing even when the film is supplied in a roll form as a primary product. In the method of producing the film, a difference of a birefringence ratio can be obtained by forcibly giving a temperature difference to the top and rear surfaces in any of an extrusion process, a casting and longitudinally orienting process, and a thermally fixing process, on the contrary by giving a cooling speed difference to the top and rear surface of the film, or alternatively by laminating polymers of different kinds by a co-extrusion system and using a difference of a crystallization speed between the both. For example, a material is extruded in a sheet form, one surface is cooled and set at a cooling speed of 10 deg.C/sec or more on a 10-40 deg.C casting drum, the other surface opposite to the casting drum is cooled by air, and the film is oriented.
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公开(公告)号：JPH07241972A
公开(公告)日：1995-09-19
申请号：JP3718294
申请日：1994-03-08
Applicant: TORAY INDUSTRIES
Inventor： HAGIWARA IKUO , TAKAUCHI SHINJI , OTA TSUYOSHI
IPC: B32B27/00 , B29C55/12 , B29K67/00 , B29K105/16 , B29L9/00 , B32B27/20 , B32B27/36 , C08L67/00 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE:To enhance handling properties, winding characteristics and output characteristics, in a biaxially oriented laminated polyester film for a high density magnetic recording medium or the like, by specifying the surface characteristics of the film so that the single surface thereof is set to a magnetic surface at the time of use as a magnetic recording medium and the other single surface is set to a running surface. CONSTITUTION:In a biaxially oriented laminated polyester film composed of laminated constitution of at least two or more layers, the outermost layers A, B thereof are formed so as to satisfy specific conditions such that the layer A contains spherical particles with an average particle diameter of 0.05-0.5mum and is characterized by that the number of the coarse projections with H3 or more is 5/100cm or less, and three-dimensional surface roughness(SRa) is 10nm or less and the layer B contains spherical particles with an average particle diameter of 0.1-1.0mum and is characterized by that three-dimensional surface roughness is 10-40nm and the ratio tB/dB of thickness tB and the average particle diameter dB is 0.2-10 and a calender shaping index is 200/m or less. Further, the total thickness of the laminated film is set to 10mum or less and the F-5 value in the longitudinal direction thereof is set to 14kg/mm or greater.
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Patent Agency Ranking
公开(公告)号：JPS6377697A
公开(公告)日：1988-04-07
申请号：JP21968486
申请日：1986-09-19
Applicant: TORAY INDUSTRIES
Inventor： OTA TSUYOSHI , SAKAMOTO SADAO , YAMAGUCHI SUSUMU
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公开(公告)号：JPH0873624A
公开(公告)日：1996-03-19
申请号：JP21739894
申请日：1994-09-12
Applicant: TORAY INDUSTRIES
Inventor： HAGIWARA IKUO , OTA TSUYOSHI
Abstract: PURPOSE: To obtain the subject polyester film giving excellent output characteristics in using as a high-density magnetic recording medium with a base material of a film having a thickness of =1000kg/mm . The layer A contains spherical particles having an average particle diameter of 0.01-0.5μm and has =H2 per 100cm and a three- dimensional surface roughness (SRa) of
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公开(公告)号：JPH0382538A
公开(公告)日：1991-04-08
申请号：JP22062889
申请日：1989-08-28
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OTA TSUYOSHI , OKABE KAZUO
Abstract: PURPOSE:To prevent electrification by making electromagnetic properties and running properties favorable, by a method wherein layers A, B are laminated, a coating layer consisting mainly of shading particulates, an antistatic agent and a lubricant is formed on the outside of the layer B, specific light transmittance, surface resistivity, surface kinetic coefficient of friction and mean roughness (Ra) on the center line of the surface are possessed and the Ra of the surface of the layer A is specified. CONSTITUTION:Layers A, B both of which are comprised of polyester are laminated and a coating layer consisting mainly of shading particulates, an antistatic agent and a lubricant is formed on the outside of the layer B. Light transmittance, surface positivity of the outside of the layer B, the kinetic coefficient of friction of the outside of the layer B, mean roughness (Ra) on the center line of the outside of the layer B and the Ra of the outside of the layer A are made respectively 60% or less, 10 OMEGA or less, 0.20 or less, 0.010-0.025 mum and smaller than 0.015 mum. The shading particulates are made into tinting particulates, various surface active agents are used for the antistatic agent and an organic compound lubricant or inorganic compound particulates are used for the lubricant.
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公开(公告)号：JPH0873625A
公开(公告)日：1996-03-19
申请号：JP21740094
申请日：1994-09-12
Applicant: TORAY INDUSTRIES
Inventor： HAGIWARA IKUO , OTA TSUYOSHI
IPC: C08J7/04 , B29C55/12 , B29K67/00 , B29L7/00 , C08J5/18 , G11B5/73 , G11B5/733 , G11B5/738 , G11B5/704
Abstract: PURPOSE: To obtain the subject film sufficiently meeting the future long-time high-density recording, having suppressed slitting defect (high edge) and giving a high-density magnetic recording medium having excellent output properties and reduced dropout by specifying the strength in transverse direction and improving the adhesive strength to magnetic layer by the easy-bonding treatment of at least one surface of the film. CONSTITUTION: This biaxially oriented polyethylene 2,6-naphthalate film for a magnetic recording medium contains a composition composed of polyethylene 2,6-naphthalate and inert particles as main elements and satisfies the conditions of a Young's modulus in transverse direction of >=1000kg/mm , and that in longitudinal direction equal to or less than (a Young's modulus in transverse direction -200kg/mm ), and characterizing that at least one surface of the film is subjected to easy-bonding treatment.
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公开(公告)号：JPH03209618A
公开(公告)日：1991-09-12
申请号：JP528190
申请日：1990-01-12
Applicant: TORAY INDUSTRIES
Inventor： TANAKA KAZUNORI , ABE KOICHI , OTA TSUYOSHI
Abstract: PURPOSE:To obtain the ferromagnetic metallic thin film supporting body excellent in an electromagnetic conversion characteristic and a handling characteristic by specifying the range of the average height of projections formed on a face which does not come into contact with the ferromagnetic metal of a biaxial orientation film. CONSTITUTION:The ferromagnetic metallic thin film supporting body is the biaxial orientation film consisting of thermoplastic resin and inactive grains A contained in the resin as main components. Surface projections consisting of the grains A contained in the resin as nucleuses are formed on the face not contacted with the thin film, i.e. a traveling face. The average height of the surface projections is 1/4 or more the average grain size of the grains A. The preferable value of the average height is >=1/3.5 and the more preferable value is >=1/3. The average height
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