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公开(公告)号：JPH09157407A
公开(公告)日：1997-06-17
申请号：JP31680595
申请日：1995-12-05
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , TSUNEKAWA TETSUYA , KOTOURA MASAAKI
IPC: D01F6/62 , B29C47/86 , B29C55/02 , B29K67/00 , B29L7/00 , C08J5/18 , C08K5/00 , C08L67/00 , C08L67/02 , C08L67/04 , D01F6/92 , G11B5/73 , H01B3/42
Abstract: PROBLEM TO BE SOLVED: To produce a tough polyester film, comprising a liquid crystalline polyester, a liquid noncrystalline polyester and a fiberizing agent, having a high rigidity and a low oligomer content and contents of a thermal decomposition product and a gel material and useful for electrical insulation, etc. SOLUTION: This polyester film comprises (A) a liquid crystalline polyester, (B) a liquid noncrystalline polyester and (C) a fiberizing agent capable of substantially fiberizing the component (A). Furthermore, the component (C) is capable of forming the dispersion state of the component (A) in a film obtained by passing a raw material containing the components (A), (B) and (C) through the melt kneading at 10 to 10s shear rate into a fibrous form having >=10 aspect ratio L/D which is a ratio of the fiber length L to the fiber diameter D and is a synthetic oil, a mineral oil, an ether compound or a >=10C higher fatty acid and a metallic salt, etc., thereof. The component (C) is contained in an amount of 0.01-10wt.% in the polyester film and the fiber diameter D of the component (A) is preferably 1μm. The component (A) preferably contains at least 15mol% ethylene terephthalate unit.
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42.发明专利
公开(公告)号：JPH08244110A
公开(公告)日：1996-09-24
申请号：JP5004495
申请日：1995-03-09
Applicant: TORAY INDUSTRIES
Inventor： KOTOURA MASAAKI , OSHIMA KATSUNORI , ABE KOICHI
IPC: C08J5/18 , B29C55/12 , B29K67/00 , B29K105/16 , B29L7/00 , B29L9/00 , B32B27/36 , C08K3/00 , C08K5/00 , C08L67/00 , C08L67/02
Abstract: PURPOSE: To enhance thermal dimensional stability, output characteristics and edge damage resistance by setting a degree of crystallization to a specific ratio or more. CONSTITUTION: A biaxially oriented polyester is based on polyethylene-2,6- naphthalene dicarboxylate and the degree of crystallization thereof is set to 40% or more. When the degree of crystallization is below 40%, sufficient thermal dimensional stability and edge damage resistant are not obtained. As a method bringing the degree of crystallization to 40% or more, a method enhancing the degree of crystallization by 2% or more by irradiating a film with infrared rays is pref. and this method is pref. performed in a winder process or a slitting process. The elastic modulus of the film in at least one of longitudinal and lateral directions is pref. 900kg/mm or more from an aspect of output characteristics and edge damage resistance and the number H3 of surface rough projections is pref. 10/100cm or less. In a case of a two-layered structure of an A-layer and a B-layer, the B-layer is the above mentioned film 4 and, when the A-layer contains particles, the thickness (t) of the A-layer and an average particle size (d) of particles satisfy a relational expression of 0.2
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公开(公告)号：JPH0899354A
公开(公告)日：1996-04-16
申请号：JP23692594
申请日：1994-09-30
Applicant: TORAY INDUSTRIES
Inventor： KOTOURA MASAAKI , OKAZAKI IWAO , ABE KOICHI
Abstract: PURPOSE: To obtain a biaxially oriented polyester film which is highly elastic, excellent in surface flatness and suitable for magnetic recording medium by using a polyester chip wherein its polyester fine content is small and its intrinsic viscosity is high. CONSTITUTION: A biaxially oriented polyester film is composed of polyester of 0.7-3.0 (dl/g) intrinsic viscosity [3h]. Its rupture elongation A is at most 200%, and the relation between rupture elongation A and elastic modulus satisfies the expression B>=-1110×log (A)+2850. Thereby, after cooling the obtain polyester under nitrogen gas flow, it is charged into methanol. After sufficiently stirring, it is filtered by using a 50mesh filter. By drying chips on the filter, polyester as the target is obtained.
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公开(公告)号：JPH07137128A
公开(公告)日：1995-05-30
申请号：JP28505793
申请日：1993-11-15
Applicant: TORAY INDUSTRIES
Inventor： KOTOURA MASAAKI , OKAZAKI IWAO , ABE KOICHI
Abstract: PURPOSE:To enable excellent image quality and a drop out characteristic to be obtained in use for a magnetic medium by a method wherein a wound posture is excellent and a film surface is difficult to be injured since a particle size and a content of a contained particle are made within specific ranges and further an air leak index is also made within a specific range. CONSTITUTION:A biaxially oriented film is obtained wherein a particle A of 0.05-3mum mean particle size is contained by 0.1-10wt.%, an air leak index of at least one side surface is 1X10 -2X10 sec, and an F5 value of at least one direction in a longitudinal direction and a width direction is 12kg/mm or over (where 0.2d
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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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Patent Agency Ranking
公开(公告)号：JP2000178367A
公开(公告)日：2000-06-27
申请号：JP26678799
申请日：1999-09-21
Applicant: TORAY INDUSTRIES
Inventor： SUGII HIKARI , KOTOURA MASAAKI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To provide a polyester film differs less in properties in the direction of width, showing excellent productivity, and being desirable for e.g. printer ribbons, capacitors, printing plates, photos, and cards. SOLUTION: Provided are a process for producing a polyester film which comprises orienting an unoriented film based on polyethylene terephthalate in the machine and transverse directions, cooling the film to the glass transition temperature or lower, and irradiating the film with UV light from at least either of the directions of thickness of the film and a polyester film produced by the above process.
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公开(公告)号：JP2000141474A
公开(公告)日：2000-05-23
申请号：JP22246599
申请日：1999-08-05
Applicant: TORAY INDUSTRIES
Inventor： KOTOURA MASAAKI , SUGII HIKARI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To obtain a polyester film low in heat shrinkage factor and capable of being widely put to practical use as a polyester film suitable for a magnetic recording medium, a printing ribbon, a condenser or packing. SOLUTION: A polyester film is produced by stretching an unstretched film based on polyethylene terephthalate in at least one of the longitudinal and lateral directions thereof and subsequently irradiating this film with UV rays in at least one direction of the thickness direction thereof to reduce the heat shrinkage factor of the film. Energy density at a time of the irradiation with UV rays is pref. 0.1-10 J/cm2.
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公开(公告)号：JP2000119416A
公开(公告)日：2000-04-25
申请号：JP29521698
申请日：1998-10-16
Applicant: TORAY INDUSTRIES
Inventor： HOSOKAWA HIROBUMI , KOTOURA MASAAKI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To obtain in high productivity a polyester film having high quality while reducing the occurrence of troubles caused by a liquid crystal polyester in film formation by using a non-liquid crystal polyester and a copolyester having mesogenic groups in the main chain and having a specified dispersion diameter and a specified maximum dispersion diameter. SOLUTION: The copolyester should have an average dispersion diameter (Rave) of 0.05-0.8 μm, and a maximum dispersion diameter (Rmaz) substantially in the range: Rmax
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公开(公告)号：JPH11322971A
公开(公告)日：1999-11-26
申请号：JP14039198
申请日：1998-05-08
Applicant: TORAY INDUSTRIES
Inventor： YAMAGATA TETSUYA , KOTOURA MASAAKI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To prepare a high-quality polyester film which can prevent the rise in filtration pressure during passing through a filter and the film breakage, has a high stiffness, has few surface defects and a low oligomer content, and is excellent in chemical resistance, or the like, by compounding a non-liq.- crystalline polyester with a specific copolyester. SOLUTION: This polyester film is formed from a blend comprising a non-liq.- crystalline polyester (A) and a copolyester (B) which has mesogenic groups in the main chain and contains 0.5-25 mol.% aliph. dicarboxylic acid units. In a method for producing a polyester film by melt extruding a polymer and then conducting filtration with a filter, the filtration pressure is decreased by at least 20 % by adding ingredient B in an amt. of 1 wt.% based on ingredient A. For example, ingredient B comprising structural units of formulas I, II, and III and contg. aliph. dicarboxylic acid units (R2 : formula IV) as the units of formula III is pref.
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公开(公告)号：JPH11291433A
公开(公告)日：1999-10-26
申请号：JP10306998
申请日：1998-04-14
Applicant: TORAY INDUSTRIES
Inventor： HOSOKAWA HIROBUMI , KOTOURA MASAAKI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To provide a polyester film being effective particularly in the case when it is used as a base film of a high-density magnetic recording medium and having excellent smoothness and slipperiness. SOLUTION: In a biaxially oriented polyester film composed of two layers at least, at least one layer is constituted of a composition of polyester (A) of non-liquid crystal properties and copolymeric polyester (B) containing a mesogen group in a main chain. An average dispersion size of disperse domains of the copolymeric polyester (B) is 10-150 nm, relative standard deviation of the dispersion size 1.2 or below, an average height of projections existing on the surface layer part of the film 5-50 nm and an average number of the projections 2,000,000-90,000,000/mm .
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