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    LAMINATED POLYESTER FILM
    12.
    发明专利
    LAMINATED POLYESTER FILM 失效

    公开(公告)号：JPS6453839A

    公开(公告)日：1989-03-01

    申请号：JP21216187

    申请日：1987-08-25

    Applicant: TORAY INDUSTRIES

    Inventor： ABE KOICHI ,  MIMURA TAKASHI ,  KIDA KATSUMI

    IPC: B32B27/18 ,  B32B27/36 ,  C08L67/02 ,  G11B5/73 ,  G11B5/733

    Abstract: PURPOSE:To obtain a film, prominent in both of reeling style and anti-scraping property, by a method wherein the ratio of the average grain size of inert inorganic particles contained in a polyester film to the thickness of a polymer layer, containing no inert inorganic particle substantially, is limited within a specified range while the volume of effective spaces, produced by the projections on the surface of the film, is also limited in 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, the volume of effective spaces, produced by projections on said surface, it limited within the range of 1X10 -5X10 . According to this method, the shock absorbing capacity of the projections, existing on the surface of the film, may be improved. Accordingly, the film, prominent both in the reeling style as well as in the anti-scraping property thereof, may be obtained.

    LAMINATED POLYESTER FILM FOR MAGNETIC RECORDING MEDIUM
    13.
    发明专利
    LAMINATED POLYESTER FILM FOR MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH07249219A

    公开(公告)日：1995-09-26

    申请号：JP4146794

    申请日：1994-03-11

    Applicant: TORAY INDUSTRIES

    Inventor： ITO KIYOHIKO ,  KIDA KATSUMI ,  TSUCHIBUCHI MASANOBU

    IPC: B32B27/36 ,  C08L67/00 ,  G11B5/73 ,  G11B5/733 ,  G11B5/735 ,  G11B5/704

    Abstract: PURPOSE:To obtain a laminated polyester film excellent in scratch resistance and running durability by specifying the volume average particle diameter and content of inert particles in a polyester film layer to be laminated and the orienting characteristics of the resultant laminated polyester film. CONSTITUTION:A polyester film layer contg. 0.1-8wt.% inert particles having 0.1-2.0mum volume average particle diameter is laminated on at least one side of a polyester film layer having >=3mum thickness to obtain the objective laminated polyester film having a face orientation index F and DELTAN which satisfy the inequalities DELTAN =1,340-8, 627XF and -60

    POLYESTER FILM FOR MAGNETIC RECORDING MEDIUM
    14.
    发明专利
    POLYESTER FILM FOR MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH07244833A

    公开(公告)日：1995-09-19

    申请号：JP3167194

    申请日：1994-03-01

    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 improve a running durability for a repeated usage, improve slitting characteristics in a manufacturing process and realize high picture quality by a method wherein a prescribed contact of spherical silica particles having prescribed characteristics are contained. CONSTITUTION:A film contains 0.005-5.0wt.% of spherical silica particles which have volume average particle diameters of 0.1-2.0mum whose relative standard deviation defined by formula I is 0.3-1.5 and whose particle size distribution curve shows a one-peak distribution when the grade widths H (mum) of the particle diameters are expressed by formula II. The surface orientation index F and DELTAN of the silica particle satisfy formulae III simultaneously. In the formula I, Di denotes an area-circle equivalent diameter (mum) which is obtained from the projection area of each particle and DN denotes a numerical averageof area-circle equivalent diameters [SIGMAi1-nDi)/n] (mum) and (n) denotes the number of measured particles. In the formula II, the right side shows an integer which is obtained by cutting off the decimal part of a value obtained as the square root of (n). In the formulae III, DELTAN=(NMD-NTD)X1000, and F=(NMD+NTD /2-nz.

    BIAXIALLY ORIENTED POLYESTER FILM FOR MAGNETIC TAPE
    17.
    发明专利
    BIAXIALLY ORIENTED POLYESTER FILM FOR MAGNETIC TAPE 失效

    公开(公告)号：JPH0428527A

    公开(公告)日：1992-01-31

    申请号：JP13476890

    申请日：1990-05-24

    Applicant: TORAY INDUSTRIES

    Inventor： KIDA KATSUMI ,  MORIMOTO HIROYUKI ,  HATTORI TETSUYA

    IPC: C08J5/18 ,  B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  C08L67/00 ,  G11B5/73

    Abstract: PURPOSE:To obtain a polyester film having the extremely small quantity of an oligomer deposited even at the time of not only immediately after the manufacture of a magnetic tape but also after conservation for a prolonged term under high humidity at a high temperature by using a biaxially oriented polyester film having specified relationship among the difference of the MD refractive index and TD refractive index of the film, a surface orientation coefficient, a mean refractive index and a polymer crystallization index. CONSTITUTION:OG shown in the formula I of the polyester film must have a value from 0 to 0.4. In formula I, DELTAn is displayed in formula II, and nMD and nTD represent the refractive indices of MD (the longitudinal direction of the film) and TD (the cross direction of the film) respectively. A surface orientation coefficient fn and a mean refractive index n* are expressed by formulae III, IV. nZD represents a refractive index in the thickness direction of the film. A polymer crystallization index P1 represents an index defined by P=0 on Tc-Tg>=60 deg.C and P1=1 on Tc-Tg

    MANUFACTURE OF POLYESTER FILM
    18.
    发明专利
    MANUFACTURE OF POLYESTER FILM 失效

    公开(公告)号：JPS63251222A

    公开(公告)日：1988-10-18

    申请号：JP8753187

    申请日：1987-04-08

    Applicant: TORAY INDUSTRIES

    Inventor： KIDA KATSUMI ,  OKABE KAZUO ,  MORIMOTO HIROYUKI

    IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  C08J5/18

    Abstract: PURPOSE:To manufacture a biaxially oriented film which has few whiskers and is favorable in slitting properties, by controlling a crystalline grain diameter and crystalline facial orientation index of a polyester film so as to satisfy a specific formula. CONSTITUTION:A film is manufactured by controlling a polyester crystalline grain diameter Sc, crystalline facial orientation index Xi and n of an obtainable biaxially oriented polyester film so that a formula is satisfied by those. If the film is less than 5 of the formula, this means that the above parameters Sc, Xi, n of the film do not satisfy the formula. As the film is manufactured by controlling those parameters Sc, Xi, n, the film which has very few whiskers and is extremely favorable in slitting properties can be obtained stably.

    MANUFACTURE OF POLYESTER FILM
    19.
    发明专利
    MANUFACTURE OF POLYESTER FILM 失效

    公开(公告)号：JPS63251221A

    公开(公告)日：1988-10-18

    申请号：JP8549487

    申请日：1987-04-07

    Applicant: TORAY INDUSTRIES

    Inventor： KIDA KATSUMI ,  OKABE KAZUO ,  MORIMOTO HIROYUKI

    IPC: B29C55/12 ,  B29D7/01 ,  B29K67/00 ,  B29L7/00 ,  C08J5/18

    Abstract: PURPOSE:To manufacture a biaxially oriented film which has few whiskers and is favorable in slitting properties, by controlling an inner haze and a facial orientation coefficient so that a specific formula is satisfied. CONSTITUTION:A film is manufactured by controlling an inner haze H, facial orientation coefficient fn and n of an obtainable biaxially oriented polyester film so that a formula is satisfied by those. When the obtained film exceeds 5 of the formula, this means that the above parameters H, fn, n of the film do not satisfy the formula. As a film is manufactured by controlling those parameters H, fn, n, the film which has very few whiskers and is extremely favorable in slitting properties can be obtained stably.

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