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公开(公告)号：JPH06128397A
公开(公告)日：1994-05-10
申请号：JP30287392
申请日：1992-10-14
Applicant: TORAY INDUSTRIES
Inventor： MINAMIZAWA HIDEHITO , ABE KOICHI
IPC: B29C55/12 , B29K67/00 , B29L7/00 , B32B27/36 , B32B33/00 , C08J5/18 , C08K3/22 , C08L67/00 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PURPOSE:To obtain the title film which has high scratch resistance unattainable by any conventional polyester film and can give a magnetic tape improved in insusceptibility to tape edge damage during running. CONSTITUTION:The tape consists mainly of ethylene naphthalate units, contains 0.13-3wt.% particles comprising an oxide of an element of the 5th or 6th period of the periodic table and having a mean primary particle diameter of 0.001-0.3mum and an average degree of agglomeration of 2-100 and has a Young's modulus of elasticity of 600kg/mm or above in the direction of film width.
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公开(公告)号：JPH06128394A
公开(公告)日：1994-05-10
申请号：JP27998492
申请日：1992-10-19
Applicant: TORAY INDUSTRIES
Inventor： OKAZAKI IWAO , ABE KOICHI , MINAMIZAWA HIDEHITO
Abstract: PURPOSE:To obtain the title film resistant to surface scratch and can give a magnetic medium excellent in image quality and dropout prevention by using organic particles of a specified strength and specifying the number of protrusions on the film surface. CONSTITUTION:The film contains organic particles (desirably divinylbenzene particles and/or silicone particles) having a 10% deformation strength of 3-30kgf/ mm and has 2X10 -5X10 protrusions/mm on at least one surface. Although the polymer as a constituent of the film is not particularly limited, a polyester mainly consisting of ethylene terephthalate is preferable because the dubbing and scratch resistances can be improved thereby. This film is resistant to surface scratch and can give a magnetic medium excellent in image quality and dropout prevention.
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公开(公告)号：JPH04336227A
公开(公告)日：1992-11-24
申请号：JP10752291
申请日：1991-05-13
Applicant: TORAY INDUSTRIES
Inventor： OKAZAKI IWAO , ABE KOICHI , MINAMIZAWA HIDEHITO
Abstract: PURPOSE:To enhance scratch resistance and to especially improve dubbing resistance as a magnetic recording body by forming a biaxially oriented thermoplastic resin film by providing a film layer A based on a thermoplastic resin A containing specific inert particles to at least the single surface of a film layer B based on a thermoplastic resin B. CONSTITUTION:As a thermoplastic resin layer B, a crystalline polymer, for example, polyester or polyamide is used. A thermoplastic resin layer A composed of, for example, ethylene terephthalate or ethylene 2,6-naphthalate is formed to the surface of the layer B. The particle size of inert particles, for example, composed of colloidal silica contained in the resin layer A is 0.2-5 times the thickness of the layer A, the content thereof is 0.05-20wt.% and the thickness of the layer A itself is 0.005-3mum. The particles are treated with 0.0001-10.0wt.% of an isocyanate compound and 0.0001-10.0wt.% of a water-soluble polyester compound.
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公开(公告)号：JPH04125810A
公开(公告)日：1992-04-27
申请号：JP24826390
申请日：1990-09-17
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
IPC: G11B5/706
Abstract: PURPOSE:To produce the film having excellent scratch resistance even during high-speed traveling by specifying the surface form (Rp/Ra ratio) of the nonmagnetic surface of the video tape and the curling characteristic of the tape to specific ranges. CONSTITUTION:The pellets formed by mixing the particle master pellets of polyethylene (PE) terephthalate contg. the particles and the pellets of the PE terephthalate contg. substantially no particles in such a manner that the content of the particles attains a prescribed ration are dried under a reduced pressure. These pellets are supplied to an extruder and are melt extruded and cooled to solidity, by which an unstretched film is formed. This film is stretched longitu dinally and is further stretched transversely. The stretched film is heat treated to obtain the biaxially oriented film. A magnetic coating material is applied on this film and is subjected to magnetic orientation. The coating is then dried. Further, the film is subjected to a calender treatment then to curing. The Rp/Ra ratio of the nonmagnetic surface is 4 to 20 at this time and the curling amt. is 0.05 to 1mm. The measurement of the scratch resistance reveals that the film satisfying the Rp/Ra ration and the curling characteristic is excellent in the scratching resistance as well even during the high-speed traveling.
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公开(公告)号：JPH02214734A
公开(公告)日：1990-08-27
申请号：JP3512089
申请日：1989-02-16
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
IPC: B29C55/12 , B29K67/00 , B29L7/00 , C08G63/18 , C08G63/78 , C08J5/18 , C08K3/22 , C08K7/00 , C08L67/00 , C08L67/02
Abstract: PURPOSE:To provide the subject film containing specific amounts of two specific kinds of particles, having excellent scratch resistance and abrasion resistance and suitable as a base film for magnetic tape, packaging film and film for various industrial materials. CONSTITUTION:The objective film contains two kinds of particles A and B. The particle A is selected from alpha-alumina, gamma-alumina, delta-alumina, zirconia, titanium nitride and organic polymer and has an average particle diameter of 5-400nm and its content in the film is 0.1-2wt.%. The particle B is selected from silica, calcium carbonate, alumina, rutile titania and organic polymer and has an average particle diameter of 400-1,500nm and its content in the film is 0.01-0.4wt.%. The difference between the cooling crystallization temperature and the glass transition point of the particle A is preferably
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Patent Agency Ranking
公开(公告)号：JPH01320135A
公开(公告)日：1989-12-26
申请号：JP15333788
申请日：1988-06-20
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
Abstract: PURPOSE:To improve scratch resistance, by a method wherein organic high- molecular particles are contained within a film and a relation between a surface parameter and the coefficient of friction and a single index of the particle are made so as to fall within specific range. CONSTITUTION:The title film is mainly comprised of a composition composed of polyester and inactive organic high-molecular particles whose temperature at the time of a loss in weight by 10% is at least 350 deg.C, possesses a single index of the particle of the inactive organic high-molecular particles of at least 0.5 and satisfies formulas I, II by a relation between the coefficient of friction Y of the film and a surface parameter (beta/sigma). Hereupon, sigma and beta are respectively standard deviation of a distribution of heights of the protrusions and mean flatness of the protrusions. Then the film is principally constituted of a structural unit selected out of polyester ethylene terephthalate, ethylene alpha,beta-bis(2- chlorphenoxy)ethane-4,4'-dicalboxylate, and ethylene 2,6-naphthalate units. With this construction, the film which is hard to be scraped off and hard to be injured even at running under a high temperature and high humidity can be obtained.
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公开(公告)号：JPH01232021A
公开(公告)日：1989-09-18
申请号：JP15088888
申请日：1988-06-17
Applicant: TORAY INDUSTRIES
Inventor： NISHINO SATOSHI , MINAMIZAWA HIDEHITO , ABE KOICHI
Abstract: PURPOSE:To manufacture a polyester film of superior resistance to wear by specifying the density difference range between the film and contained particles, the range of average particle diameters of the particles and the content of them and the range of thickness direction refractive index respectively. CONSTITUTION:0.01-5wt.% of inactive particles of 0.08-3mum average particle diameter are included in a polyester such as polyethylene terephthalate or the like. Then, said polyester is dried, fed into an extruder and filtered with high accuracy, and then melt extruded out of a slit-shaped cap, cooled and solidified to manufacture a non-oriented film. Said non-oriented film is biaxially stretched and biaxially oriented to manufacture a polyester film having 0.65g/cm or less of density difference between the polyester film and inactive particles and 1.47-1.53 refractive index in the thickness direction. Affinity between inactive particles and polyester is enhanced by said process to generate special interaction and form surface projection effectively, while falling-off of particles is eliminated to enhance resistance to wear.
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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：JPH0994877A
公开(公告)日：1997-04-08
申请号：JP25251595
申请日：1995-09-29
Applicant: TORAY INDUSTRIES
Inventor： MINAMIZAWA HIDEHITO , YOSHIDA MINORU , TSUNASHIMA KENJI
IPC: C08J5/18 , B29C55/12 , B29C55/14 , B29K67/00 , B29L7/00 , C08G63/127 , C08G63/181 , G11B5/73 , G11B5/704
Abstract: PROBLEM TO BE SOLVED: To extremely improve two characteristics of missing printing and gradation properties in the use of a thermal transfer material corresponding to the reduction of the thickness of a membrane in the use of a thermal transfer material being a final product of a biaxially oriented polyester film. SOLUTION: The Young's modulus of a film in its longitudinal direction is 550kg/mm and the number of rough damages with a length of 3mm or more on the surface of the film is set to 20/m or less.
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公开(公告)号：JP2576215B2
公开(公告)日：1997-01-29
申请号：JP31442288
申请日：1988-12-12
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
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