公开(公告)号：DE60312253D1

公开(公告)日：2007-04-19

申请号：DE60312253

申请日：2003-05-27

Applicant: TORAY INDUSTRIES

Inventor： ONO MASAAKI ,  OKAMOTO KATSUYA ,  FUKATA KAZUYOSHI

IPC: C08J7/04 ,  C08J5/18 ,  G11B5/62 ,  G11B5/64 ,  G11B5/733 ,  G11B7/24 ,  G11B7/253

Abstract: A polyester film comprising a coating layer which comprises organic fine particles and organic compounds on one-side surface of the polyester film, the weight ratio of the organic fine particles to the organic compounds in the coating is 1:0.2 to 1:5.0, the diameters of surface protrusions on the coating surface are 20 to 60 nm, the number of surface protrusions on the surface of the coating layer is 3 million to 100 million per square millimeter, and the surface roughness Ra of the coating surface is 0.5 to 1.9 nm, is suitable as a base film of a recording medium having excellent image quality and excellent durability without shaving an MR head.

公开(公告)号：DE69329188T2

公开(公告)日：2001-04-05

申请号：DE69329188

申请日：1993-05-10

Applicant: TORAY INDUSTRIES

Inventor： OKAMOTO KATSUYA ,  ABE KOICHI ,  NAKAJIMA SYOJI

IPC: B29C55/00 ,  C08J5/18 ,  G11B5/73

公开(公告)号：DE69327489T2

公开(公告)日：2000-06-15

申请号：DE69327489

申请日：1993-08-12

Applicant: TORAY INDUSTRIES

Inventor： OKAZAKI IWAO ,  KIMURA MASAHIRO ,  MASATOSHI AOYAMA ,  SUZUKI MASARU ,  ABE KOICHI ,  NAKAMORI YUKARI ,  MINAMIZAWA HIDEHITO ,  OKAMOTO KATSUYA ,  TANAKA HIROYUKI

IPC: B32B27/20 ,  C08J5/18 ,  G11B5/73 ,  G11B5/738

Abstract: A biaxially oriented film and a laminated film contain organic particles at a content of 0.001 to 20% by weight. The strength when deformed by 10% (S10) of the organic particles is in the range of 3 to 30 kgf/mm and the thermal decomposition temperature for causing 10% loss in weight thereof is not lower than 350 DEG C. The weight average diameter thereof is in the range of 0.005 to 5 mu m. The film is particularly useful as a base film of a magnetic tape.

公开(公告)号：EP2590191A4

公开(公告)日：2015-11-25

申请号：EP11800591

申请日：2011-06-09

Applicant: TORAY INDUSTRIES

Inventor： MIZUSHIMA MASAMI ,  OKAMOTO KATSUYA ,  ASANO TETSUYA

IPC: H01G4/18 ,  B29C55/12 ,  C08J5/18

CPC classification number: H01G2/00 ,  B29C55/12 ,  B29K2023/12 ,  B29K2995/0072 ,  C08J5/18 ,  C08J2323/12 ,  H01G4/18 ,  Y10T428/24355

公开(公告)号：JP2003151188A

公开(公告)日：2003-05-23

申请号：JP2002113854

申请日：2002-04-16

Applicant: TORAY INDUSTRIES

Inventor： ONO MASAAKI ,  OKAMOTO KATSUYA ,  FUKADA KAZUYOSHI

IPC: G11B5/64 ,  G11B5/73 ,  G11B15/467

Abstract: PROBLEM TO BE SOLVED: To provide a method capable of reproducing a video recorded image very fast from a video recorded video tape and further to provide a method capable of performing work for collectively storing video recorded contents of a large amount of video recorded video tapes in one magnetic tape in a short period of time. SOLUTION: In a method for reproducing a video tape using a helical scanning type video tape recorder, a MR (magnetic resistance) head is used as a reproducing head, a video tape is made to run at a speed n-fold as fast as a speed in a video recording mode in reproducing the video tape, and the reproducing head is made to run on a recording track of the video tape by making the running speed of the reproducing head n-fold as fast as a recording head speed in the video recording mode. By recording the video tape video recorded images reproduced by this method on a magnetic video tape of higher recording density than the video tape, video recorded images of a plurality of video tapes are collectively stored in one magnetic tape.

公开(公告)号：JP2002234957A

公开(公告)日：2002-08-23

申请号：JP2001033959

申请日：2001-02-09

Applicant: TORAY INDUSTRIES

Inventor： ONO MASAAKI ,  OKAMOTO KATSUYA ,  FUKADA KAZUYOSHI

IPC: C08J5/18 ,  G11B5/64 ,  G11B5/73

Abstract: PROBLEM TO BE SOLVED: To provide a polyester film for magnetic recording medium which can provide DVC(digital video) tapes with reduced DO(drop out), even when manufacturing and storing the DVC tapes using the films in the rainy season or summer. SOLUTION: In the polyester film for magnetic recording medium, surface A on which a ferromagnetic metal thin film layer is formed in manufacturing a magnetic recording medium has a surface roughness Ra of from 1 to 5 nm. The number of polyester oligomers having a length of >=0.1 μm on the surface of a film after being left to stand for 7 min under vacuum of 30 Pa is

公开(公告)号：JP2002208131A

公开(公告)日：2002-07-26

申请号：JP2001002564

申请日：2001-01-10

Applicant: TORAY INDUSTRIES

Inventor： ONO MASAAKI ,  OKAMOTO KATSUYA ,  TAKAUCHI SHINJI

IPC: G11B5/73 ,  G11B5/65 ,  G11B5/738

Abstract: PROBLEM TO BE SOLVED: To provide a polyester film for a magnetic recording medium, which obtains a DVC(Digital Video Cassette) tape less in DO(drop out) even if the DVC tape is manufactured from the rainy season to the summer season. SOLUTION: In the polyester film for the magnetic recording medium, the surface roughness Ra of one surface A of the polyester film is 2 to 5 nm, the deposited quantity of polyester oligomers having >=0.1 μm major axis is

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

IPC: C08J5/18 ,  B29C55/00 ,  B32B27/36 ,  C08G63/18 ,  G11B5/64 ,  G11B5/73

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.

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.

公开(公告)号：JPH10275324A

公开(公告)日：1998-10-13

申请号：JP34655897

申请日：1997-12-16

Applicant: TORAY INDUSTRIES

Inventor： TANAKA HIROYUKI ,  OKAMOTO KATSUYA ,  MIYAKE TORU

IPC: C08J5/18 ,  B29C55/12 ,  B29K67/00 ,  B29L9/00 ,  B32B27/36 ,  G11B5/73 ,  G11B5/704

Abstract: PROBLEM TO BE SOLVED: To obtain a film roll having a good winding style even if a film is taken up at a high speed by forming the surface average roughness at a specific cut-off value on a surface provided with a magnetic layer, surface waving index and the number of coarse projections to specific values. SOLUTION: The film consisting essentially of polyester is so formed that cut-off value of the surface provided with at least the magnetic layer is 0.08 and at this time the surface average roughness Ra is =2.0 to , by which the polyester film for magnetic recording media is obtd. The roughness and surface waving of the film are confined within the prescribed ranges and the coarse projections are decreased as far as possible in such a manner, by which the polyester film having the output characteristics, traveling property and winding style necessary for the base film of the magnetic recording media of a digital recording type, etc., is obtd.