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公开(公告)号：JP2001023161A
公开(公告)日：2001-01-26
申请号：JP19438599
申请日：1999-07-08
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , NAKAMURA KAZUO , TANAKA KAZUHIRO
Abstract: PROBLEM TO BE SOLVED: To manufacture a film roll for magnetic recording medium having a high elastic modulus that is just suitable for manufacture of a digital video tape assuring a long-time recording with high productivity. SOLUTION: A film roll for magnetic recording medium having a high elastic modulus is wound on a cylindrical core, wherein the thickness of film is 6 μm or less, Ra value of one surface A is 1 to 5 nm, Young's modulus is 10,000 MPa or more, film width is 300 mm or more, length is 2,000 m or more, difference H (μm) between the left end diameter of roll and the right end diameter satisfies H
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公开(公告)号：JP2000187829A
公开(公告)日：2000-07-04
申请号：JP36271098
申请日：1998-12-21
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , HAYASHI TAKASHI , FUKADA KAZUYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a digital video tape having good durability and a little dropout number and to provide a polyester film for a magnetic recording medium which is suitable for the production of the tape. SOLUTION: This polyester film for a magnetic recording medium has a discontinuous coating film essentially comprising a polymer and fine particles on one surface and has minute surface projections of 10 to 50 nm height by the minute particles. In the polyester film, the density of the minute surface projections having 10 to 50 nm height is 1×106 to 1×108 pieces/mm2. The discontinuous part of the discontinuous coating film is coated with a lumpy material, and the discontinuous part coated with the lumpy material is lower than the surface of the discontinuous coating film. A ferromagnetic metal thin film layer is formed on the polyester film for a magnetic recording medium.
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公开(公告)号：JP2000071403A
公开(公告)日：2000-03-07
申请号：JP24485098
申请日：1998-08-31
Applicant: TORAY INDUSTRIES
Inventor： HATANO HIROSHI , TAKAUCHI SHINJI , ONO MASAAKI
IPC: B32B27/36 , B29C47/06 , B29C48/305 , B29K67/00 , B29L7/00 , B29L9/00 , B32B33/00 , C08G63/86 , G11B5/64 , G11B5/73 , G11B5/733 , B29C47/14
Abstract: PROBLEM TO BE SOLVED: To provide a polyester film suitable to a material for a magnetic recording tape of a digital recording type and having small number of rough protrusions, excellent surface shape and a high speed production. SOLUTION: In the polyester film obtained by laminating at least two types of polyester compositions, a specific resistance of the overall laminated film at the time of melting at 285 deg.C is 1×10 Ω cm or less, a thickness of at least one surface layer (a) is 2 μm or more, a polyester composition A for constituting the layer (a) adopts a germanium compound as a polymerization catalyst, and a metal element amount except germanium contained in the composition A is 20 ppm or less. The magnetic recording tape comprises a ferromagnetic metal thin film layer provided on a surface of the film.
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公开(公告)号：JP2000025105A
公开(公告)日：2000-01-25
申请号：JP19169098
申请日：1998-07-07
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , FUKADA KAZUYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a polyester film for a magnetic recording medium which is preferable to manufacture a digital video tape whose drop-out number is small. SOLUTION: A polyester film comprises 3-90 millions/mm2 of minute surface projections having a height of 10-50 nm provided on one side (A) of the polyester film, wherein the surface projections having a height of 50-120 nm in presence of the surface (A) of the polyester film have 40 thousands/mm2 or less and the surface defects having a height above 120 nm have 400/100 cm2 or less. A ferromagnetic metal thin film layer is provided on the film, so as to obtain a magnetic recording tape.
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公开(公告)号：JPH11170466A
公开(公告)日：1999-06-29
申请号：JP34798697
申请日：1997-12-17
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAMOTO KATSUYA , TAMADA KAZUSHI
IPC: B32B27/36 , C08G63/183 , C08G63/189 , G11B5/64 , G11B5/66 , G11B5/73 , G11B5/733 , G11B5/735
Abstract: PROBLEM TO BE SOLVED: To provide a base film suitable for manufacturing a digital video tape in which the number of dropouts(DO) is small and superior durability in repeated traveling and the prevention of head cloggings at the time of reproduction is provided. SOLUTION: In a magnetic recording medium polyester film, aluminum silicate particles of 40-100 nm average particle diameter are contained, and the sRa value of one surface A is 2-4 nm and the sRz value thereon is 10-40 nm, and the surface A is provided with surface protrusions formed of the silicate particle, and the film containing fine particles and an organic compound is formed on the surface A.
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Patent Agency Ranking
公开(公告)号：JPH1191053A
公开(公告)日：1999-04-06
申请号：JP25519197
申请日：1997-09-19
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , OKAZAKI ITSUKI , HARADA SUNAO
Abstract: PROBLEM TO BE SOLVED: To obtain a magnetic tape free from cut at a feeding surface even at the time of accelerating vacuum depositing velocity and heat deterioration of a film by incorporating aluminum silicate particles each having specified mean particle size, and specifying SRa value and SRz value of one side surface. SOLUTION: An SRa of one side surface A of the polyester film is preferably 2 to 4 nm so as to reduce as small wear as possible by a video head at the time of recording/reproducing a ferromagnetic metal thin film formed on the surface A by a vacuum deposition and to hold output characteristics of a DVC tape satisfactory. And, an SRz value is preferably 10 to 40 nm so as to hold durability of the thin film of the DVC tape at the time of repeatedly recording/ reproducing many times and to reduce as little drop-out as possible by the DVC tape. Surface protrusions are formed of aluminum silicate particles each having mean particle size of 100 to 500 nm existing in the film on one side surface B of the polyester film.
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公开(公告)号：JPH10308012A
公开(公告)日：1998-11-17
申请号：JP11713697
申请日：1997-05-07
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , ONISHI MASAYA , HARADA SUNAO
Abstract: PROBLEM TO BE SOLVED: To obtain a magnetic recording tape having an excellent preservable property at a high temp. and traveling durability by providing the one side surface of a polyester film having the Young's moduli in the longitudinal direction and transverse direction of specific values and having thermal shrinkage rates of specific values in the longitudinal and transverse directions with a ferromagnetic metallic thin-film layer. SOLUTION: The Young's modulus in the longitudinal direction of the polyester film is specified to =8000 MP and the thermal shrinkage rate of 100 deg.C and 30 minutes is specified
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公开(公告)号：JPH10261215A
公开(公告)日：1998-09-29
申请号：JP6436297
申请日：1997-03-18
Applicant: TORAY INDUSTRIES
Inventor： TAMADA KAZUSHI , SUZUKI MASARU , ONO MASAAKI
Abstract: PROBLEM TO BE SOLVED: To provide an adequate base film which has excellent electromagnetic conversion characteristics and has good handling quality for forming a digital video tape of decreased DOs(drop-outs). SOLUTION: The SRa value of the one side surface (A) of the polyester film is 2 to 4nm and the SRz value is 10 to 40nm. The other one side surface (B) consists of a film and the particulates existing in the film and/or on the surface of the film and in this case, 20 to 80wt.% of the film of the polyester film consists of an easy adhesive high polymer having (fluorine or silicone compd.) as a copolymn. component. The outer side of the surface (A) is provided with a ferromagnetic metallic thin-film layer and the outer side of the surface (B) is provided with a back-coating layer and such film is used.
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公开(公告)号：JPH10172127A
公开(公告)日：1998-06-26
申请号：JP32844196
申请日：1996-12-09
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , HARADA SUNAO , TAMADA KAZUSHI
Abstract: PROBLEM TO BE SOLVED: To provide a base film adequate for forming a digital video films which is excellent in electromagnetic conversion characteristics and has decreased DOs (drop-outs). SOLUTION: The SRa value of the one side surface A of this polyester film is 2 to 4nm and the SRz value is 10 to 40nm. The SRa value of the other one side surface B is 5 to 15nm and the SRz value is 5 to 250nm. An easily slipperable coating layer formed by coating application does not exist on the outer side of the surface B. The number of the projections of >=540nm in height is 2 to 20 pieces/100cm . The polyester film is used by providing the outer side of the surface A with a ferromagnetic metallic thin-film layer.
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公开(公告)号：JPH09164644A
公开(公告)日：1997-06-24
申请号：JP34673595
申请日：1995-12-13
Applicant: TORAY INDUSTRIES
Inventor： ONO MASAAKI , FUKADA KAZUYOSHI , TAKAUCHI SHINJI
IPC: B32B15/09 , B29C55/02 , B29K67/00 , B29K105/16 , B29L9/00 , B29L31/34 , B32B15/08 , B32B27/00 , B32B27/20 , B32B27/36 , G11B5/64 , G11B5/73 , G11B5/733 , G11B5/704
Abstract: PROBLEM TO BE SOLVED: To provide a base film for a long-time recordable digital video tape good in vacuum vapor deposition processability and having strong electromagnetic conversion characteristics and good durability. SOLUTION: This film is obtained by laminating a layer A composed of polyester and a layer B composed of polyester containing fine particles. In this case, the SRa value of the outer surface of the layer A is 1-5nm and the SRz value thereof is 10-50nm while the SRa value of the outer surface of the layer B is 10-50nm, the SRz value thereof is 50-200nm and the Young's modulus thereof is 4.90-7.85GPa/9.81-14.71GPa in longitudinal direction/lateral direction. A ferromagnetic metal membrane layer is provided on the surface of a polyester film with a thickness of 6μm or less for a magnetic recording medium and the outer surface of the layer A of the composite polyester film thereof.
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