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公开(公告)号：JP2586006B2
公开(公告)日：1997-02-26
申请号：JP5254785
申请日：1985-03-18
Applicant: TORAY INDUSTRIES
Inventor： JUKI KAZUICHI , KIDA KATSUMI , KANO YORIFUMI
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公开(公告)号：JPH07323511A
公开(公告)日：1995-12-12
申请号：JP12127394
申请日：1994-06-02
Applicant: TORAY INDUSTRIES
Inventor： OTONASHI AKIRA , KIDA KATSUMI
IPC: B32B27/36 , B32B33/00 , C08K3/00 , C08K5/00 , C08K7/16 , C08L67/00 , C08L67/02 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE:To obtain a polyester film having good electromagnetic conversion characteristics and excellent surface characteristics and suitable for a magnetic recording medium by using the recycle raw material of a polyester bottle in one layer. CONSTITUTION:The recycle raw material of a polyester bottle used in a base layer part is the recycle product of a container based on polyester called a pet bottle. Utilizable polyester is polyester produced and molded by a usual polymerization method. Non-polyester foreign matter such as a metal component is removed from a used recycled pet bottle and this treated bottle is washed and ground to be subjected to a raw material. The ground recycled raw material and a particle free polymer are mixed to obtain a base layer part raw material which is, in turn, used to obtain a laminated biaxially oriented polyethylene terephthalate film. In the evaluation of the scratch resistance and electromagnetic conversion characteristics of this film, when the recycled raw material is used, film quality standing comparison with a reference value using no recycled raw material is obtained.
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公开(公告)号：JPH07114725A
公开(公告)日：1995-05-02
申请号：JP26067093
申请日：1993-10-19
Applicant: TORAY INDUSTRIES
Inventor： ITO KIYOHIKO , ODAJIMA AKIO , KIDA KATSUMI
IPC: C08J5/18 , B29C55/12 , B29K67/00 , B29K105/16 , B32B27/36 , C08K3/36 , C08L67/00 , C08L67/02 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE:To provide a polyester film excellent in running performance, running durability against repeated use, winding characteristics like a pancake and slitting characteristics and useful as a base film for a magnetic recording medium satisfying even the requirement of high image quality. CONSTITUTION:This polyester film contains spherical silica particles having 0.1-2.0mum volume average particle diameter and a relative standard deviation of >0.5 in polyester and simultaneously satisfies inequalities DELTAN -50 and 0.152
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公开(公告)号：JPS6453840A
公开(公告)日：1989-03-01
申请号：JP21216287
申请日：1987-08-25
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , MIMURA TAKASHI , KIDA KATSUMI
Abstract: PURPOSE:To obtain a film, prominent in both of anti-scratch property and anti-scraping property, by a method wherein polymer layers, having the thickness of a ratio within a specified range with respect to the average grain size of inert inorganic particles contained in polyester, are laminated and the ratio of particles of the inorganic particles in respective layers is limited within a specified range while the volume of effective spaces, produced by projections on the surface of a film, is also limited within a specified range. CONSTITUTION:A polymer layer, having the thickness of 0.01C-0.5C (unit is mum) and containing no inert inorganic particles substantially, is provided on at least one side of a film having the principal constituent of a composite consisting of polyester and inert inorganic particles having an average grain size C (mum). In this case, said polymer layer contains inert inorganic particles having the average grain size of 0.01C-0.35C and the volume of effective spaces, produced by projections on the surface of a laminating surface, is limited within the range of 1X10 -5X10 . According to this method, the shock absorbing capacity and viscoelastic characteristic of the projections, existing on the surface, may be improved. Accordingly, the film, prominent in both of anti-scratch property and anti-scraping property, may be obtained.
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公开(公告)号：JPS63104822A
公开(公告)日：1988-05-10
申请号：JP24958586
申请日：1986-10-22
Applicant: TORAY INDUSTRIES
Inventor： ITOYAMA KUNIYOSHI , ADACHI KOICHI , KIDA KATSUMI , MORIMOTO HIROYUKI
Abstract: PURPOSE:To provide super slitting properties and good dimension stability by making crystalline orientation coefficient, while orientation coefficient, the number of micro-voids, crystalline size, heat shrinkage rate and distortion elasticity modulus most suitable respectively. CONSTITUTION:Polyethylene terephthalate is fed to an extruder and biaxially oriented to prepare a film being within the range of crystalline coefficient of 0.03-0.11, whole orientation coefficient of 0.155-0.175, the number of micro- voids of 500-5,000pcs./mm and 45-65A of crystalline size, and also within the range of heat shrinkage rate of 0.01-0.13% in the film longitudinal direction and distortion elasticity rate of 3X10 -5X10 N/m . Said film, when slitting, particularly slitting in a state of being a magnetic layer on the film, scarcely generates whiskers or powders, and also when the magnet layer is applied to the film to process a tape, the film is not likely to stretch to form any transforming distortion and offers superior dimension stability.
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Patent Agency Ranking
公开(公告)号：JPS6395933A
公开(公告)日：1988-04-26
申请号：JP24127686
申请日：1986-10-13
Applicant: TORAY INDUSTRIES
Inventor： YOSHII TOSHIYA , ITOYAMA KUNIYOSHI , KIDA KATSUMI , MORIMOTO HIROYUKI
Abstract: PURPOSE:To improve the slitting property of the title film, by a method wherein the surface orientation coefficient, the number of micro-void, the crystalline size, the degree of axial orientation and the containing amount of diethylene grycol of the biaxially orientated polyethylene terephthalate film are specified. CONSTITUTION:The film of the present invention is a biaxially orientated polyethylene terephthalate film, containing 0.2-2.0wt% of diethylene grycol and provided with the surface orientation coefficient of film of 0.03-0.11, the number of micro-void of 100-5,000pcs/mm and the crystalline size of 45-65Angstrom . Whisker or powder is hardly produced when the film is slit under a condition that a magnetic layer is laid thereon, therefore, the film is optimum for the use of a video tape or the like and useful for graphic stamping foil or the like. Said film may be manufactured by any method.
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公开(公告)号：JPH0836739A
公开(公告)日：1996-02-06
申请号：JP17126494
申请日：1994-07-22
Applicant: TORAY INDUSTRIES
Inventor： ITO KIYOHIKO , ODAJIMA AKIO , KIDA KATSUMI
Abstract: PURPOSE:To provide a film which excels in a dropout characteristic and travelling durability by using a polyester film which contains a specific quantity of spherical silica particles having a particle diameter within a specific range to make the surface orientation index satisfy a specific formula. CONSTITUTION:This polyester film contains 0.005 to 5.0wt.% of spherical silica particles in which the volume average particle diameter is 0.1 to 2.0mum, the relative standard deviation is 0.3 to 1.5 and the particle size distribution curve at the predetermined grade width shows single peak distribution. The surface orientation index F and DELTAN are set so as to simultaneously satisfy DELTA
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公开(公告)号：JPH0836738A
公开(公告)日：1996-02-06
申请号：JP17125994
申请日：1994-07-22
Applicant: TORAY INDUSTRIES
Inventor： ITO KIYOHIKO , ODAJIMA AKIO , KIDA KATSUMI
Abstract: PURPOSE:To provide a film which excels in a dropout characteristic and travelling durability by using a polyester film which contains a specific quantity of spherical silica particles having a particle diameter within a specific range to make the surface orientation index satisfy a specific formula. CONSTITUTION:This polyester film contains 0.005 to 5.0wt.% spherical silica particles in which the volume average particle diameter is 0.1 to 2.0mum, the relative standard deviation is 0.3 to 1.5 and the particle size distribution curve at the predetermined grade width shows single peak distribution. The surface orientation index F and DELTAN are set to simultaneously satisfy DELTAN
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公开(公告)号：JPH07304938A
公开(公告)日：1995-11-21
申请号：JP9724994
申请日：1994-05-11
Applicant: TORAY INDUSTRIES
Inventor： OTONASHI AKIRA , KIDA KATSUMI
IPC: B32B27/36 , C08G63/85 , C08K3/08 , C08K7/18 , C08L67/00 , C08L67/02 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE:To provide a polyester film which is excellent in scratch resistance and slit characteristics and useful as the base film for a magnetic recording medium having good electromagnetic conversion characteristics. CONSTITUTION:The film has at least one layer which contains antimony (Sb) and germanium (Ge) in an amt. of (Sb+Ge) of 10-400ppm and in a wt. ratio of Ge/Sb of 0.001-0. 5.
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公开(公告)号：JPH07114723A
公开(公告)日：1995-05-02
申请号：JP26026593
申请日：1993-10-18
Applicant: TORAY INDUSTRIES
Inventor： ITO KIYOHIKO , ODAJIMA AKIO , KIDA KATSUMI
IPC: C08J5/18 , B29C55/12 , B29K67/00 , B29K105/16 , B32B27/36 , C08K3/36 , C08L67/00 , C08L67/02 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE:To obtain a polyester film excellent in running performance, running durability at the time of repeated use, winding characteristics like a pancake and slitting characteristics and useful as a base film for a magnetic recording medium satisfying even the requirement of high image quality. CONSTITUTION:This polyester film contains spherical silica particles having 0.1-2.0mum volume average particle diameter and a relative standard deviation of >0.5 in polyester and simultaneously satisfies inequalities DELTAN 1,413-8,327XF, -20DELTAN 12.5, wherein DELTAN=(NMD-NTD)X1,000, F=(NMD+NTD)/2-nz (where NMD is the refractive index of the film in the longitudinal direction, NTD is the refractive index of the film in the transverse direction and nz is the refractive index of the film in the thickness direction) and F-5(TD) is the value (F-5) in the transverse direction of the film.
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