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公开(公告)号：JPH03115437A
公开(公告)日：1991-05-16
申请号：JP25618689
申请日：1989-09-29
Applicant: TORAY INDUSTRIES
Inventor： MINAMIZAWA HIDEHITO , NISHINO SATOSHI , ABE KOICHI
Abstract: PURPOSE:To prepare a biaxially oriented polyester film exhibiting a high scratch resistance during the processing and use of the film by incorporating into the film a specified amt. of particles which have a specified mean primary particle diameter when dispersed in the film and comprise an oxide of a group V or VI element. CONSTITUTION:A biaxially oriented polyester film is made from a polyester contg. 0.01-3wt.% particles having a mean primary particle diameter of 1-300nm when dispersed in the film and comprising an oxide of a group V or VI element (e.g. cerium oxide, zirconium oxide, or tin oxide). A mean degree of aggregation of the particles in the film of 5-100 is pref. to enhance the scratch resistance. Besides the oxide particles, other inert particles may be incorporated into the polyester, silica and calcium carbonate being pref. A mean primary particle diameter and content of the inert particles in the film of 30-200nm and 0.01-0.5wt.%, respectively, are pref. to further enhance the scratch resistance. Thus a scratch-resistant biaxially oriented polyester film useful as a base film for a magnetic recording medium is produced.
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公开(公告)号：JPH0390329A
公开(公告)日：1991-04-16
申请号：JP22435989
申请日：1989-09-01
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
Abstract: PURPOSE:To make the density of particle protrusions high and the height of said protrusions uniform by forming inert particles having a predetermined diameter and inert particles being cohering particles in which many primary particles whose diameter is smaller than the average diameter of said inert particles having a predetermined diameter are linked without having directional properties. CONSTITUTION:A thermoplastic resin A and a film mainly composed of inert particles A, B are co-extruded and laminated on at least one surface of a film mainly composed of a thermoplastic resin B in a thickness of not less than 0.01mum to form a biaxially oriented thermoplastic resin film. The average diameter of the inert particles A is 0.1 to 10 times the thickness of the film layer of said thermoplastic resin A, and the inert particles B are constituted of cohering particles in which many primary particles whose average diameter is smaller than that of the inert particles A are linked without having directional properties. The shape of the inert particles A is not restricted especially; however, particles whose diametral ratio in the film is 1.0 to 1.3, and especially, spherical particles are preferable because such particles allow the surface of the film to be hardly flawed and make abrasion resistance better.
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公开(公告)号：JPH02214732A
公开(公告)日：1990-08-27
申请号：JP3511889
申请日：1989-02-16
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
Abstract: PURPOSE:To provide the subject film containing specific amounts of two specific kinds of inert particles, having high scratch resistance, effective in preventing the damage of a magnetic layer applied to the film and suitable as a base film for magnetic tape. CONSTITUTION:The objective film contains two kinds of inert particles A and B. The particle A has an average particle diameter d1 of 10-500nm and a Mohs hardness of >=6 and its content in the film is 0.2-2.0wt.%. The particle B has an average particle diameter d2 of 300-1,500nm and larger than the average diameter d1 of the particle A, a Mohs hardness of 1. The surface resistivity of the film is preferably OMEGA.cm.
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公开(公告)号：JPH02194030A
公开(公告)日：1990-07-31
申请号：JP1545789
申请日：1989-01-24
Applicant: TORAY INDUSTRIES
Inventor： MINAMIZAWA HIDEHITO , NISHINO SATOSHI , ABE KOICHI
Abstract: PURPOSE:To obtain the title film excellent in abrasion resistance and travelling performance by biaxially orienting an unstretched film of a polyester containing a specified amount of metallic particles by biaxial stretching. CONSTITUTION:An unstretched film of a polyester (e.g. polyethylene terephthalate) containing 0.005-5wt.% metallic particles of a mean particle diameter of 0.01-3mum comprising at least one member selected from among the elements of Groups VIII, Ib, IIb, IIIb and IVb of the periodic table (e.g. Fe, Co, Ni, Pd, Sn, Cu, Ag, Au, Al or Pb) is biaxially oriented by biaxial stretching to obtain the title film desirably having a standard deviation of the heights of the protrusions formed on the surface of 20-650nm.
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公开(公告)号：JPH02158629A
公开(公告)日：1990-06-19
申请号：JP31442288
申请日：1988-12-12
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
Abstract: PURPOSE:To produce the title film producing tapes having surface to be slightly damaged even by high-speed travel and image qualities (ratio of signal/noise) not lowering in dubbing process by blending a polyester with specific silicon carbide particles to exhibit fixed properties. CONSTITUTION:A biaxially orientated film comprising a polyester and silicon carbide particles having 0.01-2.0mum average particle diameter, >=14cm Raman crystallized index of total reflection on at least one side of film and =0.6. A polyester comprising ethylene terephthalate as a main constituent component is especially preferable because of further improvement in dubbing properties and scratching resistance. The silicon carbide particles are preferably triangular-decagonal.
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Patent Agency Ranking
公开(公告)号：JPH01319127A
公开(公告)日：1989-12-25
申请号：JP15333688
申请日：1988-06-20
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
Abstract: PURPOSE:To provide the recording medium which withstands the higher speed of a calendering stage and the higher speed of dubbing and winding by forming the magnetic recording medium which is incorporated with org. high-polymer particles in a base material film and contains inorg. particles in one of magnetic layers and specifying the sphericity of the org. high-polymer particles and the standard deviation of the height distribution of surface projections to specific ranges. CONSTITUTION:The magnetic layer is provided on one face of the base material film essentially consisting of polyester. The magnetic layer 0.1-20wt.% inorg. particles and the base film contains 0.01-8.0wt.% inert high-polymer particles. The org. high-polymer particles are required to be the inert particles which do not make covalent bonding, etc., with the polyester. The sphericity of the high-polymer particles is 1.2 and the standard deviation of the projection height distribution on at least one face of the base material film is in a 40-250nm range. The surface resistant to flawing is obtd. in this way and the degradation in image quality by dubbing is obviated.
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公开(公告)号：JPH01234228A
公开(公告)日：1989-09-19
申请号：JP6233288
申请日：1988-03-15
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
Abstract: PURPOSE:To obtain a film whose scratch resistance and dubbing resistance at the time of running are favorable and running properties at the time when the film is made into a tape are excellent, by specifying a parameter of surface roughness of the film, thermal shrinkage stress and their combination. CONSTITUTION:A ratio Rp/Ra (their units are both nm) between mean surface roughness Ra on the center line and a depth Rp of the center line of at least on a side of a film mainly comprised of a composition comprised of polyester and an inactive inorganic particle is 4-25. The product Rz.S between thermal shrinkage stress S (kg/mm ) of a longitudinal direction at 90 deg.C and mean surface roughness Rz, (nm) at ten points of at least on the side falls within a range of 0.5-21.5. Thermal shrinkage stress of the longitudinal direction at 60 deg.C is under 0.09kg/mm . Colloidal silica, synthetic calcium carbonate, alpha-alumina and rutile type titanium dioxide are especially preferable as a kind of the in active inorganic particle. It is especially preferable that a form of an inorganic particle is spherical substantially. It is effective to add a matter obtained by mixing the inactive inorganic particle into ethylene glycol in a form of slurry to contain the inactive inorganic particle into the fixed polyester.
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公开(公告)号：JPH01230641A
公开(公告)日：1989-09-14
申请号：JP5762388
申请日：1988-03-10
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , NISHINO SATOSHI , MINAMIZAWA HIDEHITO
Abstract: PURPOSE:To make it possible to improve the surface strength and dimensional stability of a biaxially oriented polyester film comprising a polyester, a polyolefin and inert inorganic particles by specifying the molecular weight, crosswise strength at break and average height of protrusions on either surface. CONSTITUTION:This biaxially oriented polyester film is based on a composition comprising 90-99.8wt.%, particularly, 95-99% polyester (A) mainly consisting of ethylene terephthalate units, 0.2-10wt.%, particularly, 1-5wt.% polyolefin (B), desirably, polypropylene and 0.3-1.5wt.%, particularly, 0.4-0.8wt.% inert inorganic particles (C), desirably, colloidal silica of a mean particle diameter of 0.15-1.2mum prepared by the alkoxide process, wherein an Mn of component B is 6000-30000, desirably, 10000-27000, an Mw/Mn ratio =50%, desirably, >=80% and an average protrusion height on at least either surface is 20-500nm, desirably, 40-200nm. This film is desirable as a magnetic recording medium.
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公开(公告)号：JP2001322157A
公开(公告)日：2001-11-20
申请号：JP2000143213
申请日：2000-05-16
Applicant: TORAY INDUSTRIES
Inventor： MINAMIZAWA HIDEHITO , HAGIWARA IKUO
IPC: B29C47/68
Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing a thermoplastic resin film which can manufacture a film of high quality and containing a mall quantity of foreign matters for a long period of time, without the necessity of having to replace a filter by using a filter which has a high filtering accuracy and can suppress the generation of modified resins. SOLUTION: In the method for manufacturing a film wherein a thermoplastic resin is melted by means of an extruder, filtered by a filter, and then delivered from a die, and cooled and cured on a casting drum, a leaf disk filter wherein the filter comprises two or mote layers of filtering mediums having different filtering accuracy and/or void, and the filtering accuracy of the filtering mediums at the most downstream side of the flow of resins is 20 μm or less, and the filter medium at the most downstream side of the flow of resins is in direct contact with a supporting body in the filter is used.
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公开(公告)号：JPH11342535A
公开(公告)日：1999-12-14
申请号：JP15127098
申请日：1998-06-01
Applicant: TORAY INDUSTRIES
Inventor： SATO KIMIO , TOYODA KATSUYA , MINAMIZAWA HIDEHITO
Abstract: PROBLEM TO BE SOLVED: To efficiently remove the low mol.wt. substance volatilized from a film. SOLUTION: In a method for producing a biaxially oriented polyester film by using a tenter 1 performing streching at least in one direction, a platinum catalyst 9 is arranged in a hot air circulating route 5 when heat treatment is applied after the stretching in the tenter 1 and the temp. of circulated hot air is controlled to 200 deg.C or higher at the position of the platinum catalyst 9 and the low mol.wt. substance generated from the film 3 is burnt by the platinum catalyst 9.
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