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公开(公告)号：JP2002173540A
公开(公告)日：2002-06-21
申请号：JP2000371216
申请日：2000-12-06
Applicant: TORAY INDUSTRIES
Inventor： EGASHIRA KENICHI , SUGII HIKARI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To provide a polyester film for a magnetic recording medium, capable of being sufficiently used as a supporter for the magnetic recording medium, especially the magnetic recording medium having very thin magnetic layer such as the one with
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公开(公告)号：JP2000143837A
公开(公告)日：2000-05-26
申请号：JP31474198
申请日：1998-11-05
Applicant: TORAY INDUSTRIES
Inventor： EGASHIRA KENICHI , TSUNEKAWA TETSUYA , ASAKURA MASAYOSHI
Abstract: PROBLEM TO BE SOLVED: To obtain a polyethylene terephthalate film improved in chipping resistance, scratch resistance, and the easiness of being slit by selecting a film having a specified extrapolated glass transition initiation temperature and a specified birefringence. SOLUTION: A fully dried polyethylene terephthalate stock is fed into an extruder, molten at a temperature at which the polyethylene terephthalate is fully plasticized so as to exhibit flowability, optionally cooled to the state of a supercooled liquid which does not solidify within a short time even if it is further cooled, and extruded onto a rotary metallic casting drum to form an unoriented or slightly oriented film. This is heated to 90-120 deg.C and oriented at a ratio of 1.5-6.5 in the machine direction by means of a group of heating metallic rolls, and oriented at a ratio of 1.5-6.5 in the transverse direction by heating to 90-180 deg.C with a tenter for transverse orientation, and heat-set at 190-230 deg.C to obtain a biaxially-y oriented polyethylene terephthalate film having an extrapolated glass transition initiation temperature of 80-95 deg.C, a birefringence of -0.03 to 0.03, a rigid amorphous region content of 15-45%, a surface orientation coefficient of 0.175-0.195, and a refractive index of 1.480-1.495 (in the direction of thickness).
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公开(公告)号：JPH11950A
公开(公告)日：1999-01-06
申请号：JP15650197
申请日：1997-06-13
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , TSUNEKAWA TETSUYA , EGASHIRA KENICHI
Abstract: PROBLEM TO BE SOLVED: To make excellent dimensional stability, modulus of rigidity, and uniformity possible by a method wherein a polyester film which is not substantially oriented nor crystallized is divided into a plurality of stages, and after restoring a size longitudinally after elongating longitudinally, the film is drawn in a width direction. SOLUTION: A polyester film which is not substantially oriented and crystallized, is drawn by dividing into two or more stages in order to add longitudinal molecular orientation. In the first drawing, the polyester film is drawn to prepare a drawn film having a stack structure. It is further drawn by one stage or multiple stages in the same direction to execute drawing corresponding to various purposes. For the film which is drawn longitudinally again, its size is restored longitudinally, and the film is drawn in the width direction thereafter. Thereby, a biaxially oriented polyester film which is excellent in thickness uniformity while dimensional stability coexists with modulus of rigidity can be manufactured with good productivity.
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公开(公告)号：JPH09300455A
公开(公告)日：1997-11-25
申请号：JP12498496
申请日：1996-05-20
Applicant: TORAY INDUSTRIES
Inventor： EGASHIRA KENICHI , YOSHIDA MINORU , TSUNASHIMA KENJI
Abstract: PROBLEM TO BE SOLVED: To provide a biaxially stretched polyester film capable of widely used because of high strength and excellent abrasion resistance and capable of obtaining good characteristics especially in a magnetic recording medium by specifying a ratio of the peak intensity in the lateral direction of the film and that in the thickness direction thereof measured by a laser Raman scattering method. SOLUTION: A biaxially stretched polyester film is characterized by that a ratio R(=ITD/IND) of the peak intensity (ITD) in the lateral direction of the film and the peak intensity (IND) in the thickness direction thereof at 1615cm measured by a laser Raman scattering method is 6 or more and obtained by biaxially stretching a non-stretched cast film and controlling the peak intensity ratio by the laser Raman scattering method after biaxial stretching of the film to the above mentioned range. By this constitution, the biaxially stretched polyester film having specific orientation in its lateral direction and having high strength and excellent abrasion resistance can be obtained.
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公开(公告)号：JP2003211537A
公开(公告)日：2003-07-29
申请号：JP2002012791
申请日：2002-01-22
Applicant: TORAY INDUSTRIES
Inventor： KUBOTA HIROSHI , EGASHIRA KENICHI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To provide a biaxially oriented polyester film, which is excellent in dimensional stability and the strength of the edge of a tape, has an excellent running stability and running durability as the magnetic tape and is suitable for the base film of a high density magnetic recording tape. SOLUTION: This biaxially oriented polyester film includes a polyester and a polyimide as its essential components and has the circumferential half width A of a crystal face diffraction peak in the biaxially oriented polyester main chain direction obtained in the crystal orientational analysis in a wide angle X-ray diffraction, which is 30° or more to less than 55°, and the ratio ITD/IMD of the diffraction peak ITD in the width direction (90°) to the diffraction peak IMD in the longitudinal direction (0°) is set to be 0.2 to 2. COPYRIGHT: (C)2003,JPO
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Patent Agency Ranking
公开(公告)号：JP2000071405A
公开(公告)日：2000-03-07
申请号：JP24820798
申请日：1998-09-02
Applicant: TORAY INDUSTRIES
Inventor： TSUNEKAWA TETSUYA , ASAKURA MASAYOSHI , EGASHIRA KENICHI
Abstract: PROBLEM TO BE SOLVED: To provide superior rigidity and high heat shrinkage properties and outstanding conservation stability with insignificant irreversible dimensional change due to use conditions and environments by setting the ratio of tension to Young's modulus when the film is stretched 5% at a specific value with regard to the orientation main axial direction of the film. SOLUTION: The biaxially oriented polyester film is made of a polyester which is orientated in the longitudinal and the width direction of the longer direction of the film. The orientation main axial direction of the film is a direction which shows a high refraction index and a higher orientation, of the longitudinal and the width direction. Further, with regard to the orientation main axial direction of the film, the ratio (F5/Ym) of stress during 5% stretching (F5(GP2)) to Young's modulus (Ym(GPa)) is set to be 0.025 or more and 0.034 or less. When the F5/Ym is less than 0.025 the conservation properties and the traveling endurance of a magnetic tape is deteriorated in case the film is used for the magnetic tape, due to the irreversible dimensional change of the film under use application environments. Further when the F5/Ym is 0.034 or above, the film is no longer applicable for use as the magnetic tape.
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公开(公告)号：JPH11188791A
公开(公告)日：1999-07-13
申请号：JP28655598
申请日：1998-10-08
Applicant: TORAY INDUSTRIES
Inventor： EGASHIRA KENICHI , ASAKURA MASAYOSHI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To manufacture a biaxially oriented polyester film having an excellent film manufacturing stability with a high strength to correspond to a thin film formation of the film. SOLUTION: The method for manufacturing the biaxially oriented polyester film comprises the steps of laterally and longitudinally biaxially orienting a polyester film of a substantially noncrystal state to become 0 to 0.02 of a double refraction (n) of the film and 6% or less of the degree of a crystallization, then further laterally reorienting it at a lower temperature than an orienting temperature at the previous time of the laterally and longitudinally orienting, and further longitudinally reorienting it. In this case, a ratio (A/B) of a maximum thickness (A) of an edge of the film of the substantially noncrystal state to a thickness of a lateral center is in a range of 2 to 6.
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18.发明专利
公开(公告)号：JPH11165350A
公开(公告)日：1999-06-22
申请号：JP33437597
申请日：1997-12-04
Applicant: TORAY INDUSTRIES
Inventor： ASAKURA MASAYOSHI , EGASHIRA KENICHI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To lower a degree of heat shrinkage and obtain a biaxially stretched polyester film at a low cost and in a simple manner by setting the degree of heat shrinkage of the film in all the bearings on an intrafilm surface to a specific value. SOLUTION: The degree of heat shrinkage of the film in all the bearings on an intrafilm surface at 150 deg.C for 30 min. is set at -0.2% or more and 0.3% or less. The difference between the maximum value and the minimum value of this degree of heat shrinkage is preferably 0.2% or less, and the average refraction index of the film in the thickness direction is preferably 1.611 or more and 1.615 or less, and further, the refraction index of the film in the thickness direction is preferably 1.5 or more. In addition, the microendo thermic peak of the film appearing prior to crystal fusion by DSC is preferably (melt point Tm-5)-(Tm-30) deg.C. Further, the total Young's modulus of the film in the longer direction and the width direction is preferably 7.5 GPa or more and 10.5 GPa or less. Besides, the difference between the Young' s modulus in the longer direction and the Young's moduls in the width direction is to be 0.5 GPa or less. After biaxially stretching the film, it is theremally treated and is slackened in a cooling step so that the degree of heat shrinkage of the film in the longer direction and the width direction is 3% or less and 5% or less, respectively.
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公开(公告)号：JPH10329210A
公开(公告)日：1998-12-15
申请号：JP14381997
申请日：1997-06-02
Applicant: TORAY INDUSTRIES
Inventor： ASAKURA MASAYOSHI , EGASHIRA KENICHI , TSUNASHIMA KENJI
Abstract: PROBLEM TO BE SOLVED: To improve the strength of a film with a thin thickness, and improve defects in thickness unevenness and heat shrinkage ratio, by forming the film in such a manner that the ratio of Young's modulus in the longitudinal direction of the film, the heat shrinkage ratio in the longitudinal direction of the film, and the thickness unevenness in the longitudinal direction of the film may respectively show specified values. SOLUTION: As a polyester film which is suitable for the insulating material film for electric capacitor, etc., a biaxially oriented film is used, and the film is formed in such a manner that the ratio of Young's modulus in the longitudinal direction of the film may become 5 GPa of higher, the heat shrinkage ratio in the longitudinal direction of the film at 180 deg.C, for 30 min may become 5% or less, and the thickness unevenness in the longitudinal direction of the film may become 10% or less. Also, a ratio between the peak strength in the longitudinal direction and the peak strength in the thickness direction at 1615 cm which are measured by a laser Raman scattering method is made 6.5 or higher, preferably, 7 or higher. In addition, the biaxially oriented polyester film is molten and made non-oriented, and after rapidly solidifying, a crystallization peak temperature in a temperature rising curve is measured by DSC, and the film is formed by making the crystallization peak temperature 145 deg.C or lower.
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公开(公告)号：JPH10138333A
公开(公告)日：1998-05-26
申请号：JP29883396
申请日：1996-11-11
Applicant: TORAY INDUSTRIES
Inventor： EGASHIRA KENICHI , ASAKURA MASAYOSHI , TSUNASHIMA KENJI
Abstract: PROBLEM TO BE SOLVED: To eliminate stretching irregularity in lateral stretching by setting the difference between the max. and min. values in an axial direction of a ratio of peak intensity in a longitudinal direction and peak intensity in a thickness direction measured after biaxial stretching by a laser Raman scattering method. SOLUTION: At first, a substantially non-oriented film is stretched in its longitudinal direction between rolls having peripheral speed difference and subsequently stretched in its lateral direction while temp. is stepwise lowered from first stage stretching to second stage stretching to obtain a biaxially stretched polyester film. A ratio R (=IMD/IND) of peak intensity (IMD) in the longitudinal direction and peak intensity (IND) in a thickness direction in a band of 1615cm measured by a laser Raman scattering method is an index showing the intensity of the total orientation in the longitudinal direction and this intensity ratio R must be 1 or less in the difference between the max. and min. values in the lateral direction in order to obtain a film free from physical property irregularity in the lateral direction and excellent in film forming stability. In a case exceeding 1, the film is large in physical property irregularity and low in commodity value.
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