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公开(公告)号：JPH06210720A
公开(公告)日：1994-08-02
申请号：JP516693
申请日：1993-01-14
Applicant: TORAY INDUSTRIES
Inventor： TOYODA KATSUYA , MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI
Abstract: PURPOSE:To mold a polyester film excellent in thickness uniformity and oriented at least in a longitudinal direction. CONSTITUTION:A polyester film based on polyethylene terephthalate and characterized by that the difference (Tc-Tg) between cold crystallizing temp. Tc and glass transition temp. Tg is 60 deg.C or lower is molded after the degree of crystallization of the film in a preheating stage before first stage stretching is set to 0.5-25%.
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公开(公告)号：JPH03209619A
公开(公告)日：1991-09-12
申请号：JP350090
申请日：1990-01-12
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , TOYODA KATSUYA , NAGATA RYUICHI
Abstract: PURPOSE:To improve scratching resistance, dubbing resistance and drop-out characteristics by specifying the thickness of a biaxially oriented polyester film, the relation between the diameter of particles and the thickness of the film, the content of the particles, etc. CONSTITUTION:The base film for magnetic recording media consists of the biaxially oriented polyester film formed by laminating a film essentially consisting of the polyester A and the particles on a film essentially consisting of the polyester B. The thickness of the laminated film of the polyester A is 0.005 to 3mum, the average grain size of the particles contained in the laminated film is 0.1 to 10 times the thickness of the laminated film and the content in the laminated film is 2 to 50wt.%. Further, the content of low molecular component in the entire part of a biaxially oriented polyester film is
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公开(公告)号：JP2001260210A
公开(公告)日：2001-09-25
申请号：JP2000071964
申请日：2000-03-15
Applicant: TORAY INDUSTRIES
Inventor： MIYATA SATOSHI , KOTOURA MASAAKI , TOYODA KATSUYA
IPC: B29C47/88
Abstract: PROBLEM TO BE SOLVED: To elevate the upper limit of a sheet molding speed preventing the generation of defects in a thermoplastic resin sheet in an electrostatic casting method. SOLUTION: In a method for producing the thermoplastic resin sheet, when the thermoplastic resin is extruded from a nozzle into a sheet, and the sheet is contacted with a cooling drum by the electrostatic casting method, cooled, and solidified for molding, the sheet is charged electrostatically by using tape- shaped electrodes, and a member which is different in shape or material from a member for preventing discharge to the cooling drum is fitted to the tip of the member.
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公开(公告)号：JP2001212919A
公开(公告)日：2001-08-07
申请号：JP2000028519
申请日：2000-02-07
Applicant: TORAY INDUSTRIES
Inventor： NISHINO SATOSHI , TOYODA KATSUYA , TSUCHIYA TAKESHI
Abstract: PROBLEM TO BE SOLVED: To provide a biaxially oriented polyester film showing a good winding form as a product even if the surface thereof is smooth. SOLUTION: In the biaxially oriented polyester film having a coating layer at least on its single surface, the coating layer has an island structure having island-like protruded parts and the island-like protruded parts with a length/ breadth ratio of 3.0 or less occupy 50% or more of all of the protruded parts.
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公开(公告)号：JPH11309772A
公开(公告)日：1999-11-09
申请号：JP13611698
申请日：1998-04-30
Applicant: TORAY INDUSTRIES
Inventor： MIYATA SATOSHI , TOYODA KATSUYA , FUNAYAMA NOBUTAKA
IPC: B29C47/88 , B29C48/305 , B29K101/12 , B29L7/00 , B29C47/14
Abstract: PROBLEM TO BE SOLVED: To increase the upper limit of a sheet forming speed by giving electrostatic charges to a sheet by means of a tape-like electrode and a destaticization is executed at the separation of the sheet. SOLUTION: Electrostatic charges are uniformly given with a tape-like electrode 3 to a melt thermoplastic resin 2 extruded in a sheet out of a mouthpiece 1. An electrostatically charged resin sheet is cooled and solidified on the surface of a cooling drum 4 as the cooling drum 4 rotates so as to form a resin sheet 5, which is separated at its release point 6 so as to be sent through proper guide rolls 7, 8 and 9 to the following process. In this case, a destaticization is executed at a position ahead the release point 6. Since the resin sheet is uniformly given by electrostatic charges and the electrostatic charges are destaticized at the separation of the resin sheet, the favorably tightly adhered state of the resin sheet to the cooling drum is ensured so as to allow to suppress the development of ununiform application and the discharge between the sheet and the drum, resulting in allowing to increase the upper limit speed at the molding of the sheet.
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Patent Agency Ranking
公开(公告)号：JPH10315306A
公开(公告)日：1998-12-02
申请号：JP14590297
申请日：1997-05-19
Applicant: TORAY INDUSTRIES
Inventor： OKUBO KENICHI , TOYODA KATSUYA , OKASHIRO HIDETOSHI
Abstract: PROBLEM TO BE SOLVED: To effectively prevent discharge of a cooling rotor made of an insulating material having specific volume ratio resistance by providing discharge preventive members at the rotor at both ends of an electrode made of string-like metal material disposed so as to cross a resin sheet. SOLUTION: This apparatus discharges melted resin sheet 2 from a mouthpiece, brings it into contact with a cooling rotor 3 by electrostatic charge application, cools to solidify it, and molds it in a resin sheet. As an electrode 5 for applying electrostatic charge, a string-like metal electrode is used. The electrode 5 is disposed in the vicinity directly above a landing point of the sheet 2 on the rotor 3, and disposed at a position of a distance of a range of 3 to 15 mm from the sheet 2 at a lower end of the electrode 5 to cross the sheet 2. A discharge preventive member 6 made of ceramics or resin is used to cover both the ends of the electrode 5 of this case. The member 6 is made of a material having insulation of 1×10 Ω.cm or more of a volume ratio resistance.
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公开(公告)号：JPH08333461A
公开(公告)日：1996-12-17
申请号：JP13944695
申请日：1995-06-06
Applicant: TORAY INDUSTRIES
Inventor： KOTOURA MASAAKI , TOYODA KATSUYA , TSUNASHIMA KENJI
Abstract: PURPOSE: To obtain a polyester film which contains few fine granular structures, has a high intrinsic viscosity, and is suitable for a magnetic tape for long-time recording by mixing a polyester having an elevated degree of polymn. with a polyether and forming the resulting mixture into a biaxially oriented film. CONSTITUTION: This biaxially oriented polyester film comprises a composite of a polyester and a polyether and has an intrinsic viscosity of 0.8dl/g or higher. Pref. the polyester is produced by a solid phase polymn., has a low oligomer content, and is polyethylene terephthalate or polyethylene 2,6- naphthalenedicarboxylate having an elevated degree of polymn. The polyether is a copolymer such as polyethylene oxide or polyethylene glycol and pref. has the molecular terminals blocked. The film contains the polyether in an amt. of 0.1-10wt.%, pref. 0.2-5wt.%. Thus is obtd. a high-tensile-modulus polyester film with few coarse surface projections H3.
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公开(公告)号：JPH08323854A
公开(公告)日：1996-12-10
申请号：JP9195696
申请日：1996-03-21
Applicant: TORAY INDUSTRIES
Inventor： TSUNEKAWA TETSUYA , MINAMIZAWA HIDEHITO , TSUNASHIMA KENJI , TOYODA KATSUYA
Abstract: PURPOSE: To enhance the characteristics of a magnetic tape being a final product by providing a polyester film having high strength and excellent in heat dimensional stability. CONSTITUTION: A polyester film is composed of a composite consisting of non- liquid crystal polyester and liquid crystal polyester and characterized by that the sum of Young's moduluses in the longitudinal and lateral directions of the film is 1600kg/mm or more. This film is used to obtain a magnetic resin medium.
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公开(公告)号：JPH08318566A
公开(公告)日：1996-12-03
申请号：JP9195796
申请日：1996-03-21
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , MINAMIZAWA HIDEHITO , TOYODA KATSUYA
IPC: C08J5/18 , B29C55/12 , B29K67/00 , B29L7/00 , C08G63/183 , C08G63/82 , C08L67/00 , C08L67/02 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE: To supply a film extremely high in strength and to enhance quality even if the film is made thin especially in the case used as a magnetic tape. CONSTITUTION: A biaxially oriented polyester film is characterized in that the Young's modulus in either one of the longitudinal and lateral directions of the film is 1000kg/m or more and the sum of Young's moduluses in the longitudinal and lateral directions of the film is 1600kg/mm or more.
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公开(公告)号：JPH08294963A
公开(公告)日：1996-11-12
申请号：JP12571795
申请日：1995-04-25
Applicant: TORAY INDUSTRIES
Inventor： MINAMIZAWA HIDEHITO , TSUNASHIMA KENJI , TOYODA KATSUYA
IPC: C08J5/18 , B29C55/12 , B29K67/00 , B29L7/00 , C08G63/181 , C08G63/189
Abstract: PURPOSE: To enhance the dimensional stability and mechanical strength of a polyester film by setting the ratio of dynamic loss at specific temp. to a specific range. CONSTITUTION: The ratio of the dynamic loss tanδ at 95 deg.C of a polyester film is set to 1.05-15, pref., 1.05-1.4. When polyester is polyethylene-2,6-naphthalate, the dispersion peak of tanδ is observed in the vicinity of 95 deg.C and this dispersion peak is considered to be based on the motion of a naphthalene ring and, when the ratio of tank at 95 deg.C is within this range, the motion of molecules is restrained and the dimensional change by heat of the film and the deformation at a time of the reception of long-time stress of the film are hard to generate.
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