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公开(公告)号：JP2001252965A
公开(公告)日：2001-09-18
申请号：JP2000068422
申请日：2000-03-13
Applicant: TORAY INDUSTRIES
Inventor： KOTOURA MASAAKI , MIYATA SATOSHI , TOYODA KATSUYA
IPC: B29C47/88
Abstract: PROBLEM TO BE SOLVED: To provide a method for producing a thermoplastic resin sheet in which in a static electricity applying cast method using tape electrodes, the generation of the defect of electricity application nonuniformity in the sheet is prevented stably for a long time. SOLUTION: In the method for producing the sheet, when a thermoplastic resin is extruded from a nozzle into a sheet, and the sheet is made to adhere to a cooling drum by the static electricity applying cast method, cooled, and solidified for molding, an electrostatic charge is applied to the sheet by using the tape electrodes which have a rectangular cross section of a uniform form in the longitudinal direction and are made of stainless steel containing at least 10 wt.% of nickel.
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公开(公告)号：JPH1120003A
公开(公告)日：1999-01-26
申请号：JP18744897
申请日：1997-06-27
Applicant: TORAY INDUSTRIES
Inventor： OKASHIRO HIDETOSHI , TOYODA KATSUYA , OKUBO KENICHI
IPC: B29C47/88 , B29K101/12 , B29L7/00
Abstract: PROBLEM TO BE SOLVED: To obtain a sheet stably at high speed under high efficiency by a method wherein a blade-like electrostatic applicator is provided in the neighborhood of the lending point of a thermoplastic resin sheet to a cooling rotator and, in addition, the widthwise end parts of the thermoplastic resin sheet is pressed to a cooling rotator side with a pressing means provided in the neighborhood of the landing point. SOLUTION: A thermoplastic resin is widthwise broader at a mouthpiece 1 and then discharged into the form of a thermoplastic resin sheet 3 and quenched after being landed to a cooling rotator 2. In the neighborhood of this landing pint 2, a blade-like electrostatic applicator 4 is provided over nearly the whole surface of the thermoplastic resin sheet 3. The electrostatic applicator 4 is connected to a DC high tension power source so as to apply electrostatic charge to the thermoplastic resin sheet 3 so as to bring the sheet into close contact with the surface of the cooling rotator 2. In addition, at least one edge part of the sheet in the neighborhood of the landing point 8, a pressing means 9, in which a gas jetting device or the like is employed, is provided. As a result, the end part of the thermoplastic resin sheet 3 is prevented from getting inside out, resulting in realizing the efficient application of electrostatic charge to the thermoplastic resin sheet 3.
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公开(公告)号：JPH10258458A
公开(公告)日：1998-09-29
申请号：JP6622697
申请日：1997-03-19
Applicant: TORAY INDUSTRIES
Inventor： MINAMIZAWA HIDEHITO , TOYODA KATSUYA , OKASHIRO HIDETOSHI
Abstract: PROBLEM TO BE SOLVED: To neatly take up a broad film after being made into the film and further realize the favorable planeness of a product by a method wherein the thickness of the film is set to be more than a specified thickness and the ratio between the surface roughnesses of the front and of the surfaces of the film is set to be a specified value or less. SOLUTION: The thickness of a biaxially oriented polyester film is limited to be 50μm or more, preferably to 70μm or more and more preferably to 100μm or more. The ratio between the surface roughness Ra of the front and of the rear surfaces of the film must be 1.3 or less, preferably 1.255 or less and more preferably 1.2 or less. When the ratio between the surface roughnesses of the front and of the rear surfaces of the film goes wide of the above-mentioned range, unpreferably poor conveyability at the process of the film and poor taken-up state at the cutting of a product. Polyester, which is enough dried, is fed to various extruders and passed through a filter, which is selected in response to necessity, and melt-extruded through a mouthpiece slit into a shape of a film. The filmy polyester is quenched and solidified into an amorphous state by being cast on a casting film, the temperature of which is controlled to be 20-60 deg.C.
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公开(公告)号：JPH08258118A
公开(公告)日：1996-10-08
申请号：JP8651095
申请日：1995-03-17
Applicant: TORAY INDUSTRIES
Inventor： YAMAMOTO AKIKO , TOYODA KATSUYA , TSUNASHIMA KENJI
IPC: B29C47/88 , B29C48/305 , B29C48/92 , B29C55/14 , B29K67/00 , B29L7/00 , G11B5/73 , B29C47/14 , B29C47/92 , G11B5/704
Abstract: PURPOSE: To obtain a polyester film having excellent mechanical strength by improving the casting step before the orienting step of a biaxially oriented polyester film in which double refraction and the other characteristics are specified. CONSTITUTION: A cast film formed by melt extrusion by using a flat die has a double refraction Δn of 0.2×10 Δn , and a cast polyester film simultaneously satisfies a formula (a+b)/2C>=1.25 and a formula a/b>=1.20, where a, b and c are CP/HAS spectrum of benzene ring carbon at positions l, 3 in a structural analysis by a solid state high resolution NMR, and indicate the heights in which a background is subtracted from the peak height at the position of A=134ppm and C=131.6ppm of the CP/MAS spectrum.
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公开(公告)号：JPH08245811A
公开(公告)日：1996-09-24
申请号：JP7827595
申请日：1995-03-08
Applicant: TORAY INDUSTRIES
Inventor： TOYODA KATSUYA , FURUKAWA KEIICHI , TSUNASHIMA KENJI
Abstract: PURPOSE: To improve resistance to thermal deterioration by forming a mixture of a polyester incapable of functioning as a liquid crystal and a polyarylate capable of functioning as a liquid crystal into a sheet, stretching the sheet, and conducting heat setting. CONSTITUTION: A polyester incapable of functioning as a liquid crystal and having an intrinsic viscosity of 0.8 or higher is blended with 0.1-40wt.% polyarylate capable of functioning as a liquid crystal and having a melt viscosity of 100-1,000 P, a diameter of 5μm or smaller, and an aspect ratio of 10 or higher. The blend is extruded into a sheet and cooled to obtain an amorphous cast film. The film is heated to 80-150 deg.C, stretched in the machine direction 2-7 times, and cooled to 20-50 deg.C. This film is stretched at 80-150 deg.C in the transverse direction 2-6 times and then subjected to heat setting at 150-250 deg.C. Thus, the objective film is obtained which has an oligomer content of 0.4wt.% or lower and a terminal carboxyl content of 15eq/ton or lower, and in which the 180 deg.C-heating time required for the film to have a machine-direction elongation at break which is a half of the initial value thereof is 50hr or longer.
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Patent Agency Ranking
公开(公告)号：JPH08216543A
公开(公告)日：1996-08-27
申请号：JP4646995
申请日：1995-02-10
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , TOYODA KATSUYA
Abstract: PURPOSE: To obtain heat-sensitive stencil printing base stock having high perforation sensitivity and resolution by a constitution wherein the film is made of composite body film consisting of non-liquid crystalline polyester, the crystalline melting energy of which is below the predetermined value, and liquid crystalline polyarylate. CONSTITUTION: Heat-sensitive stencil film is made of composite body film consisting of non-liquid crystalline polyester, the crystalline melting energy of which is not more than 8cal/g, and liquid cystalline polyarylate, the main chain of which has mesogen group and which is solution-formable and liquid crystal-formable. The intrinsic viscosity of non-liquid crystalline polyester is set to be not less than 0.8 in order to obtain heat-sensitive stencil printing base stock having high resolution. Further, the melt viscosity of non-liquid crystalline polyester is set to be five or more times as much as that of liquid crystalline polyarylate PA and its melting point is set to be nearly equal to that of the PA. Thus, the shape of the liquid crystalline polyarylate turns into the fine and specified fibrous one, resulting in consisting high perforation sensitivity with high resolution.
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公开(公告)号：JPH08174662A
公开(公告)日：1996-07-09
申请号：JP33786494
申请日：1994-12-26
Applicant: TORAY INDUSTRIES
Inventor： YAMAKAWA TAKAMICHI , TOYODA KATSUYA , MIYAGAWA KATSUTOSHI
Abstract: PURPOSE: To enhance the mechanical strength of a film in a lateral direction by stretching the film longitudinally in a multistage fashion containing a thermal crystallization process before stretching the same laterally. CONSTITUTION: A film is stretched longitudinally in a multistage fashion of two or more stages containing a thermal crystallization process and subsequently stretched laterally. The degree of crystallization in the longitudinal stretching process is pref. 10-50% and obtained by the heating of the film on a non-tacky roll, the heating thereof in an oven, the rapid heating thereof by an infrared heater or the control of the temp. and cooling speed of the film at the time of cooling on a casting drum. The film immediately before crystallized under heating is pref. oriented so that double refraction becomes 0.5×10- -15×10- . Longitudinal stretching is pref. performed so that the film is stretched longitudinally at first by a stretching roll and the stretched film is brought into contact with a heating roll group to be crystallized and further stretched longitudinally by a stretching roll or the film is stretched longitudinally at first and the stretched film is heated and crystallized in an oven and subsequently subjected to second longitudinal stretching.
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公开(公告)号：JPH08164558A
公开(公告)日：1996-06-25
申请号：JP31219494
申请日：1994-12-15
Applicant: TORAY INDUSTRIES
Inventor： HOTTA KUNIHIRO , MIYAGAWA KATSUTOSHI , TOYODA KATSUYA
Abstract: PURPOSE: To provide an inexpensive material with which a film having a little heat contraction, excellent planeness, and low cleaving property can be obtained without increasing the cost and problems such as contraction, curling, slacking, and cleaving do not occur also in OHP and electric insulating material. CONSTITUTION: In a biaxially oriented film consisting of polyester, a heat contraction factor of the film at 190 deg.C for 20 minutes in the direction of machine is 1.0% or below and 0.3% or below at 150 deg.C for 30 minutes, and a surface crystal size by wide angle X-ray diffraction (hereinafter called X-ray) is 60-80 angstram.
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公开(公告)号：JPH10329292A
公开(公告)日：1998-12-15
申请号：JP14495197
申请日：1997-06-03
Applicant: TORAY INDUSTRIES
Inventor： MINAMIZAWA HIDEHITO , TOYODA KATSUYA , OKASHIRO HIDETOSHI
IPC: B41M5/382 , B29C55/12 , B29K67/00 , B29L7/00 , B29L9/00 , B32B27/36 , B41M5/40 , B41M5/41 , C08J5/18 , C08J7/04 , C08K5/09 , C08L67/02 , C08L71/00 , C09D167/02 , G11B5/73 , G11B5/738 , B41M5/38
Abstract: PROBLEM TO BE SOLVED: To improve easy adhesion and eliminate thickness irregularities by applying an easily adherent coating on one of the faces of a polyester film whose ratio of a peak strength in the longitudinal direction of a biaxially oriented polyester film and a peak strength in the thickness direction, at a specific number of waves measured by the laser Raman scattering process. SOLUTION: An easily adherent coating is applied to one of the faces of a polyester film whose ratio R (IMD/IND) of a peak strength (IMD) in the longitudinal direction and a peak strength (IND) in the thickness direction, at 1615 cm measured by the laser Raman scattering process is 6-20. This coating is preferably a mixture made up mainly of copolyester ether resin and higher fatty acid wax. This polyester film is oriented in a first step at a magnification of 1.5-3 times, within a range of film temperature above the Tg and below the Tg+60 deg.C of polyester at the time of orientating the film in the longitudinal direction, and then is oriented in a second step at a magnification of about 2.5-4 times after lowering the film temperatures to a level below a temperature lower by 5 deg.C than the orientation temperature of the first step.
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公开(公告)号：JPH09220754A
公开(公告)日：1997-08-26
申请号：JP5390096
申请日：1996-02-16
Applicant: TORAY INDUSTRIES
Inventor： IKEGAMI TETSUO , WACHI TAKAAKI , TOYODA KATSUYA
Abstract: PROBLEM TO BE SOLVED: To safely and efficiently produce a polycapramide type film at a high speed. SOLUTION: A polycapramide resin and a resin having melt specific resistance larger than that of the polycapramide resin are lamainated at least in two layers before extruded from a cap so that reduced melt specific resistance becomes 1×10 -1×10 Ω.cm and subsequently extruded to the surface of a cooling roll to be formed into a film. In this case, the film is electrostatically brought into close contact with the cooling roll to be quenched and solidified.
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