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公开(公告)号：JPH08244112A
公开(公告)日：1996-09-24
申请号：JP7827695
申请日：1995-03-08
Applicant: TORAY INDUSTRIES
Inventor： TOYODA KATSUYA , MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI
Abstract: PURPOSE: To obtain a biaxially oriented polyester film fully satisfying both of mechanical characteristics and thermal dimensional stability and excellent in thickness uniformity. CONSTITUTION: A biaxially oriented polyester film is produced by longitudinally stretching a cast film characterized by that a value (nM-nTD) calculated by subtracting the refractive index (nTD) in the lateral direction of the film from the refractive index (nMD) in the longitudinal direction thereof is 0.1×10 -10×10 at least over two or more stages before laterally stretching the same.
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公开(公告)号：JPH08197607A
公开(公告)日：1996-08-06
申请号：JP3162695
申请日：1995-01-26
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , TOYODA KATSUYA , MIYAGAWA KATSUTOSHI
IPC: B29C47/86 , B29C48/305 , B29L7/00 , B29C47/14
Abstract: PURPOSE: To prevent generation of surface defect of a film, particularly striping defect by specifying a product of a draft ratio for film extrusion and a film thickness when a sheet-like cast film is to be obtained by melting and extruding a thermoplastic resin by using a flat die. CONSTITUTION: In a method wherein a sheet-like cast film is manufactured by melting and extruding a thermoplastic resin by using a flat die, when a film thickness d is 100μm or less, a product Rd of a draft ratio R for film extrusion and the film thickness d is set to 1000 or above. When the film thickness d exceeds 100μm, the draft ratio R of the extrusion is set to 10 or aboves. In manufacturing, the thermoplastic resin is melted by heating to a melting completion temperature or higher and sent to the die. After the thermoplastic resin is expanded in the die in the cross direction, it is cooled, at a land of the die, to the melting completion temperature or lower and a down temperature crystallization start temperature or higher, and then extrusion molding is performed. Thus, a film having a little ferrule stripe is obtained.
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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：JPH05221114A
公开(公告)日：1993-08-31
申请号：JP5609292
申请日：1992-02-07
Applicant: TORAY INDUSTRIES
Inventor： SEKI SHIGEMI , MIYAGAWA KATSUTOSHI , MATSUURA KAZUO
Abstract: PURPOSE:To provide a recording sheet having good thermal dimensional stability, sufficient flexibility and sufficient whiteness, excellent in processing aptitude, handling properties and printing sharpness, capable of reconciling the antistatic properties of a receiving layer and the easy adhesiveness of ink or toner and having excellent characteristics. CONSTITUTION:In a recording sheet consisting of a receiving layer, a film support and a transfer ink layer, the film support is a polyester film wherein a heat shrinkage rate at 150 deg.C is below 2% and specific gravity is 1.2 or less and the receiving layer is composed of a layer containing a polymeric binder and white hiding pigment.
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公开(公告)号：JPH03114817A
公开(公告)日：1991-05-16
申请号：JP25618189
申请日：1989-09-29
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , AOKI SEIZO , ITO TATSUYA
Abstract: PURPOSE:To make it possible to easily cut manually and to realize straight cutting in the direction of cutting, especially in the longitudinal direction by a method wherein tear propagation resistance in longitudinal direction and tear propagation resistance in the direction normal to the longitudinal direction are specified. CONSTITUTION:Biaxially oriented polyester film concerned is one, the tear propagation resistance alpha(g/mm) in longitudinal direction of which is 400g/mm or less and, at the same time, the tear propagation resistance beta(g/mm) in the direction normal to the longitudinal direction of which has the relationship of beta/alpha>=1.5. In this case, any polyester will do, provided that the film made thereof can be formed and polyethylene terephthalate, polytetramethylene terephthalate, polyethylene-o-oxybenzoate, poly-1,4-cyclohexylene dimethylene terephthalate, polyethylene-2,6-naphthalane dicarboxylate and the like are exampled. Thus, film, which is easily cut and has the direction of cutting in the longitudinal direction of the initial direction of orientation, can be obtained.
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Patent Agency Ranking
公开(公告)号：JPH02284929A
公开(公告)日：1990-11-22
申请号：JP10851389
申请日：1989-04-27
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI , AOKI SEIZO
Abstract: PURPOSE:To obtain the subject film having specific density and surface-cleavage index, specified void size and small apparent density and resistant to surface cleavage by adding a specific amount of a polyolefin resin to a polyester and biaxially drawing the film of the resin. CONSTITUTION:The objective film having a film density of 0.6-1.2g/cm (preferably 0.6-0.9g/cm ) and a surface cleavage index of
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公开(公告)号：JP2000246784A
公开(公告)日：2000-09-12
申请号：JP5240299
申请日：1999-03-01
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , SAKAMOTO JUN , MIYAGAWA KATSUTOSHI
Abstract: PROBLEM TO BE SOLVED: To perform rapid casting or uniform orienting or the like of a sheet by casting so that a holding angle between a tangential line drawn on a moving cooling medium at a contact point of a sheet with the medium and a tangential line drawn to a corresponding circle of an orbit of the sheet becomes specific. SOLUTION: A polyamide raw material obtained by mixing a liquid crystal polymer or the like with a polyesteramide or the like is dried, dehydrated, then melt extruded in a nitrogen flow or in vacuum by a melt extruder without lowering a molecular weight, ionomers are laminated on both surfaces of a polyamide resin layer, and the obtained laminated melt sheet 7 is cooled and solidified by a moving cooling medium 2. Thus, a holding angle 6 between a tangential line 4 drawn at a contact point P of a melt sheet 7 extruded from a mouth 1 and the medium 2 and a tangential line 5 drawn at a point P of an imaginary corresponding circle 3 including as many locusses of the melts as possible exceeds 0 degree. Before the sheet 7 is brought into contact with the medium 2, a water membrane or static charge is formed on the medium 2, the sheet 7 is brought into contact with a drum and quenched. Thus, rapid casting can be achieved, and excellent homogeneity of a thickness of and stretchability of the film can be obtained.
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公开(公告)号：JP2000234029A
公开(公告)日：2000-08-29
申请号：JP3689799
申请日：1999-02-16
Applicant: TORAY INDUSTRIES
Inventor： SAKAMOTO JUN , TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI
Abstract: PROBLEM TO BE SOLVED: To obtain a film having excellent quality in high productivity by melting a polyester resin containing metallic elements and a phosphorus element in a ratio in a specified range, extruding the melt from a slit die to form a molten sheet and cooling the molten sheet by insertion into between a charging roll and a cooling medium to adhere a solid film on the cooling medium. SOLUTION: A polyester resin containing metallic elements and a phosphorus element in ratio represented by the formula is melted, and extruded from a slit die to form a molten sheet. The molten sheet is inserted into between a smooth-surfaced charging roll having an applied voltage of 100 V to 10 kV and a cooling medium such as a drum with a hard chromium-plated surface and an inside through which cooling water is circulated to adhere the sheet to the cooling medium to obtain a film. If required, the film is heated to the glass transition point to effect elongation and heat treatment. In the formula, (m), N, L, and P are the number of moles of the alkali metal atoms the number of moles of the alkaline earth metal atoms, the number of moles of a metallic element selected from among Mn, Co, and Zn, and the number of moles of phosphorus element per ton of the polyester resin, respectively.
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公开(公告)号：JP2000218690A
公开(公告)日：2000-08-08
申请号：JP2134999
申请日：1999-01-29
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , SAKAMOTO JUN , MIYAGAWA KATSUTOSHI
Abstract: PROBLEM TO BE SOLVED: To produce a thermoplastic resin sheet of high quality free from a surface defect with good productivity. SOLUTION: In a method for producing a thermoplastic resin sheet while feeding, heating, stretching and cooling the same in contact with rolls, at least one of the rolls is used as a charged roll to prevent the slip between the rolls and the sheet to perform film formation.
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公开(公告)号：JP2000141472A
公开(公告)日：2000-05-23
申请号：JP32031498
申请日：1998-11-11
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI , AEBA MIKA
Abstract: PROBLEM TO BE SOLVED: To prevent the generation of a twist curl in a use laminating a polyester film chiefly used for an IC card. SOLUTION: In a differential curve of the real shrinkage quantity of a polyester film in its machine direction calculated from shrinkage quantities at times of a temp. rise and a temp. drop due to TMA by heat-treating the polyester film in a tenter after longitudinal stretching and lateral stretching and subsequently cooling the heated film to a temp. range from (glass transition temp. +50 deg.C)-(heat treatment temp. -30 deg.C) and applying relax to the film in its machine direction within a range of ±10% in the shrinkage quantity at a time of a temp. drop due to TMA corresponding to the temp. drop of the cooling process up to the outlet of the tenter, a shrinkage quantity differential value dL/dT within a range from glass transition temp.-150 deg.C is always 0.02%/ deg.C or less and the heat shrinkage factor of the film in the machine direction at 150 deg.C for 30 min is 1.0% or less and the lateral distribution of this heat shrinkage factor is 0.1% or less.
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