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1.发明专利
公开(公告)号：JP2002269728A
公开(公告)日：2002-09-20
申请号：JP2001374434
申请日：2001-12-07
Applicant: TORAY INDUSTRIES
Inventor： KUBOTA HIROSHI , EGASHIRA KENICHI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To provide a high quality polyester film by which a magnetic recording medium showing satisfactory electromagnetic transducing characteristics and nearly free from track deviation and drop out can be manufactured especially when the polyester film is used as a base film for the magnetic recording medium by forming minute protrusions on the surface of the polyester film to enhance the quality such as running performance and scraping resistance. SOLUTION: In the laminated polyester film for the magnetic recording medium, formed by laminating a lamination layer part (layer B) on at least one surface of a base layer part (layer A) consisting of a polyester and a polyimide and having two or more film layers, the surface on the layer B side has 3-15 nm surface roughness, the surface opposite to the layer B has a surface roughness of 0.5-10 nm, the back ad front film surfaces have a difference of the surface roughness of 1-7 nm and the layer B has a coarse protrusion number H1 of 0-100 pieces/100 cm and the layer opposite to the layer B has a coarse protrusion number H2 of 0-10 pieces/100 cm .
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公开(公告)号：JP2001319323A
公开(公告)日：2001-11-16
申请号：JP2000139521
申请日：2000-05-12
Applicant: TORAY INDUSTRIES
Inventor： EGASHIRA KENICHI , HOSOKAWA HIROBUMI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To provide a polyester film for magnetic recording medium which can be used as a substrate of the magnetic recording medium especially having very thin magnetic layer e.g. having
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公开(公告)号：JP2000336183A
公开(公告)日：2000-12-05
申请号：JP14614999
申请日：1999-05-26
Applicant: TORAY INDUSTRIES
Inventor： ASAKURA MASAYOSHI , EGASHIRA KENICHI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To provide a biaxially oriented polyester film that has a high strength, dimensional stability and can attain high-density recording in which the deviation of the trucks for the magnetic recording is improved and its production process. SOLUTION: The objective biaxially oriented polyester film comprises mainly a polyester mainly containing the ethylene-terephthalate units and the polyether- imide units, and has the following physical properties: the Young's modulus in the longitudinal direction is >=6.5 GPa in the tensile rate of 50%/min; the thermal shrinkage of 0-0.5% at 100 deg.C in the transverse direction; the residual elongation in the longitudinal direction is 0.05-0.5% under a loading of 32 MPa in the longitudinal direction at 50 deg.C after a time passage of 72 hours and the residual elongation in the transverse direction is in the range of from -0.01 to -0.3%.
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公开(公告)号：JPH10329209A
公开(公告)日：1998-12-15
申请号：JP13882797
申请日：1997-05-28
Applicant: TORAY INDUSTRIES
Inventor： EGASHIRA KENICHI , ASAKURA MASAYOSHI , TSUNASHIMA KENJI
Abstract: PROBLEM TO BE SOLVED: To realize a thin film having strength not only in one direction but in the rectangular direction as well by performing a planar orientation of a high degree, by a method wherein a film is formed in such a manner that a ratio between the peak strengths in the orientation main axial direction and the rectangular direction and the peak strength in the thickness direction, which are measured by a laser Raman scattering method, may become a specified value. SOLUTION: For this biaxially stretched polyester film which is useful as a base film for magnetic tape, etc., the film is formed in such a manner that a ratio between the peak strengths in the orientation main axial direction and the rectangular direction and the peak strength in the thickness direction at 1615 cm , which are measured by a laser Raman scattering method, may become 5 or higher. Also, the strength ratio is, preferably, 7 or higher, and the upper limit is made approx. 48. Then, the biaxially stretched polyester film is molten and made non-oriented, and after rapidly solidifying, a crystallization heating peak temperature in a temperature rising curve is measured by DSC, and the film is formed by making the crystallization heating peak temperature 154 deg.C or lower, more preferably, 135 deg.C or lower. In this case, the intrinsic viscosity of the film is preferable to be 0.65 dl/g or higher.
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公开(公告)号：JP2003206359A
公开(公告)日：2003-07-22
申请号：JP2002004859
申请日：2002-01-11
Applicant: TORAY INDUSTRIES
Inventor： EGASHIRA KENICHI , KUBOTA HIROSHI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To provide a high-quality polyester film, which controls the generation of problems including decomposition and modification of a polymer in a film comprising a polyester and a polyimide and having a high dimensional stability, reduces the generation of defects, and hence is improved in productivity. SOLUTION: There is provided a biaxially oriented polyester film comprising a polyester (A) and a polyimide (B), wherein an imide stabilizer is included in the film, and the coarse protrusion number H1 and the coarse protrusion number H2 on the film surface satisfy the following relations: 0≤H1(pieces/100 cm 2 )≤100, 0≤H2(pieces/100 cm 2 )≤10. COPYRIGHT: (C)2003,JPO
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Patent Agency Ranking
公开(公告)号：JP2000108201A
公开(公告)日：2000-04-18
申请号：JP20329299
申请日：1999-07-16
Applicant: TORAY INDUSTRIES
Inventor： ASAKURA MASAYOSHI , EGASHIRA KENICHI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To provide a biaxially oriented polyester film suitable for a base film for a high density magnetic recording tape in which cutting or stress elongation deformation are scarcely generated at the time of using as the base film for the magnetic recording tape, and which has excellent running durability and preservability. SOLUTION: In the biaxially oriented polyester film having 7 GPa or more of either Young's modulus (YmMD) of a lengthwise direction or Young's modulus (YmTD) of a width direction, a half-value width of a diffraction peak of a crystal surface of a main chain direction of a polyester in a circumferential direction obtained at the time of rotating the film at its normal as an axis is in a range of 55 to 85 degrees by means of a crystal orientation analysis according to a wide angle X-ray diffractometer method.
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公开(公告)号：JPH11138629A
公开(公告)日：1999-05-25
申请号：JP31898997
申请日：1997-11-05
Applicant: TORAY INDUSTRIES
Inventor： ASAKURA MASAYOSHI , EGASHIRA KENICHI , TSUNEKAWA TETSUYA
IPC: B41N1/24 , B29C55/16 , B29K67/00 , B29L7/00 , B29L9/00 , B41M5/382 , B41M5/40 , B41M5/41 , C08J5/18
Abstract: PROBLEM TO BE SOLVED: To provide a film which is free from its stretching break and can be stretched at an area stretching magnification over a wide range of temperature, and further, shows high strength, wear resistance, dimensional stability and superb antistretching properties as well as a method for manufacturing the film. SOLUTION: This method for manufacturing a biaxially stretched polyester film includes a first-stage stretching step to concurrently biaxially stretch an unstretched cast film in the longitudinal and the crosswise direction at an area stretching magnification of 2-7 times within the temperature range of (glass transition temperature Tg+25) deg.C-(Tg+45) deg.C and a second-stage stretching step to concurrently biaxially stretch the cast film in the longitudinal and the crosswise direction at an area stretching magnification of 4-20 times within the temperature range of (Tg-15) deg.C-(Tg+10) deg.C following the first-stage stretching step. In addition, at least, either of the ratio R1 (IMD/ IND) of peak intensity (IMD, IND) in the longitudinal and the thickness direction or the ratio R2 (ITD/IND) of peak intensity (ITD/IND) in the crosswise and the thickness direction as measured by the laser Raman scattering method is 6 or more as the characteristics of this biaxially stretched polyester film.
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公开(公告)号：JPH10138335A
公开(公告)日：1998-05-26
申请号：JP29883196
申请日：1996-11-11
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , ASAKURA MASAYOSHI , EGASHIRA KENICHI
Abstract: PROBLEM TO BE SOLVED: To impart thickness uniformity and to achieve surface modification by longitudinally stretching a substantially oriented and uncrystallized polyester film in a manner divided into two or more stages and applying a polymer soln. or an aq. dispersion to the single surface of the film before laterally stretching the film. SOLUTION: A substantially non-oriented and uncrystallized polyester film is subjected to first stage longitudinal stretching to form a stack structure and subsequently further subjected to onestage or multistage longitudinal stretching. Next, a polymer soln. or an. aq. dispersion is widely applied to at least the single surface of the longitudinbally stretched film up to both end parts in the lateral direction of the film so that the ratio of the thickness of both end parts in the lateral direction of the film to that of the central part of the film becomes 1.5 times or more by using a roll coater. Since the lateral stretching again stretches the film having the stack structure, lateral stretching can be started before the polymer soln. or the aq. dispersion is perfectly dried.
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公开(公告)号：JPH10128845A
公开(公告)日：1998-05-19
申请号：JP28519396
申请日：1996-10-28
Applicant: TORAY INDUSTRIES
Inventor： ASAKURA MASAYOSHI , EGASHIRA KENICHI , TSUNASHIMA KENJI
Abstract: PROBLEM TO BE SOLVED: To obtain a polyester film with which a film which is strong in lateral direction and excellent in thermal characteristics can be obtained, and a thermal transfer ribbon which is excellent in printability and a traveling property at the time of thermal transfer can be made. SOLUTION: A polyester film of substantially amorphous and not oriented is oriented lengthwise at temperature of two steps or more to make a uniaxially oriented film. Thereafter, the film is oriented at a temperature of a range from a glass transition temperature or higher of the uniaxially oriented film to a crystallization peak temperature or under. Further thereafter, the film is oriented again crosswise 1.05-1.8 times at a temperature of a range from a crystallizing peak temperature or higher to a melting temperature or under. After orienting the film again crosswise, the film is heat-treated. Thereafter, the film is preferably cooled by applying relaxation thereto crosswise at temperature of two stages of a range from the heat treatment temperature or lower to 100 deg.C higher than that.
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公开(公告)号：JP2003211536A
公开(公告)日：2003-07-29
申请号：JP2002008621
申请日：2002-01-17
Applicant: TORAY INDUSTRIES
Inventor： EGASHIRA KENICHI , KUBOTA HIROSHI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To provide a manufacturing method for a biaxially oriented polyester film, the oxidative degradation of which is suppressed and which is extremely defect-free and excellent in surface quality, with a high productivity. SOLUTION: In the manufacturing method for the biaxially oriented polyester film through the melt extrusion, cooling solidification and biaxial orientation of a resin composition including a polyester (A) and a polyimide (B), the oxygen concentration in the hopper of a melt-extruding extruder is adjusted in the range of 0 to 1%. COPYRIGHT: (C)2003,JPO
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