公开(公告)号：DE69032002D1

公开(公告)日：1998-03-05

申请号：DE69032002

申请日：1990-09-25

Applicant: TORAY INDUSTRIES

Inventor： MORITA TOHRU ,  NAGAHAMA AKIHIKO ,  UEDA TOSHIAKI ,  ONO MASAAKI

IPC: B29C47/00 ,  B29C47/88 ,  B32B27/36 ,  G11B5/73

Abstract: A composite polyester film comprising a major layer and a minor layer composed of a polyester having a melt resistivity of less than 5 x 10 OMEGA .cm and lower than that of a polyester constituting the major layer and a thickness of 1/200 to 4/10 of the thickness of the composite film as a whole. The film exhibits excellent electrostatic castability and heat stability.

公开(公告)号：DE3884549D1

公开(公告)日：1993-11-04

申请号：DE3884549

申请日：1988-05-02

Applicant: TORAY INDUSTRIES

Inventor： ONO MASAAKI ,  IZASA TAKAO ,  OKABE KAZUO

IPC: B29C55/12 ,  B32B27/36 ,  C08G63/85 ,  C08G63/86 ,  C08J5/18 ,  C08J7/04 ,  G11B5/66 ,  G11B5/73 ,  G11B5/704

Abstract: Polyester film for use as a base for magnetic recording medium is prepd. from a polyester obtd. using a germanium cpd. as polymerisation catalyst, and has Young's modulus in the longitudinal direction (Emd) at least 350 kg/square mm; Young"s modulus in the transverse direction (Etd) at least 350 kg/mm2; Emd.Etd at least 250,000 square kg/mm; refractive index (nzd) across the thickness of the film at least 1.480 and not more than 1.492. The max. surface roughness (Rt) on at least one side surface is no more than 100 nm. The film may be a laminate of two films both satisfying the above criteria, in which case one film may contain fine particles and pref. has Rt no less than 30 nm.

公开(公告)号：DE3382633D1

公开(公告)日：1992-12-03

申请号：DE3382633

申请日：1983-11-01

Applicant: TORAY INDUSTRIES

Inventor： ONO MASAAKI ,  MOTEGI MASAHIKO ,  OKABE KAZUO

IPC: B32B3/14 ,  B32B5/16 ,  B32B27/36 ,  C08L67/02 ,  G11B5/00 ,  G11B5/73 ,  G11B5/733 ,  G11B5/704 ,  C08J7/04

Abstract: A thermoplastic resin base film for a magnetic recording medium includes a thermoplastic resin film (1) and a discontinuous film (2) adhering closely to at least one surface of the thermoplastic resin film (1). The discontinuous film (2) has a thickness of not larger than 0.05µm and is composed of a polymer blend containing fine particles (3). The polymer blend comprises a water-soluble polyester copolymer and a water-soluble polymer having at least one hydroxyl group in the recurring unitthereof. Fine protrusions are formed on the discontinuous film due to the presence of the fine particles therein. A magnetic recording medium using the base film is suitable for high density magnetic recording and has extremely excellent durability to repeated use.

公开(公告)号：DE3368806D1

公开(公告)日：1987-02-05

申请号：DE3368806

申请日：1983-03-09

Applicant: TORAY INDUSTRIES

Inventor： ONO MASAAKI ,  MIURA YASUKI ,  MOTEGI MASAHIKO ,  OKABE KAZUO

IPC: G11B5/64 ,  H01F10/26

公开(公告)号：DE3368805D1

公开(公告)日：1987-02-05

申请号：DE3368805

申请日：1983-03-09

Applicant: TORAY INDUSTRIES

Inventor： ONO MASAAKI ,  MIURA YASUKI ,  MOTEGI MASAHIKO ,  OKABE KAZUO

IPC: G11B5/64 ,  H01F10/26

Abstract: A laminated film comprising (A) a layer 5 composed of a thermoplastic resin and (B) a layer 1 composed of a thermoplastic resin containing fine particles therein, wherein a discontinuous skin having a height of 50 to 1,000 A is formed on the outer surface of the layer (A) and the outer surface of the layer (B) has a surface Ra value of 0.005 to 0.040µ. The laminated film is very valuable as a base film of a magnetic recording tape having a ferromagnetic metal thin film formed on the surface of the layer (A), especially a video tape, because it has a good running property and is excellent in the electromagnetic transformation performances.

公开(公告)号：DE3274401D1

公开(公告)日：1987-01-08

申请号：DE3274401

申请日：1982-08-31

Applicant: TORAY INDUSTRIES

Inventor： ONO MASAAKI ,  MOTEGI MASAHIKO ,  OKABE KAZUO

IPC: G11B5/64 ,  H01F10/28 ,  G11B5/62 ,  H01F10/12

公开(公告)号：EP1594126A4

公开(公告)日：2006-04-19

申请号：EP04708015

申请日：2004-02-04

Applicant: TORAY INDUSTRIES

Inventor： ONO MASAAKI ,  FUKATA KAZUYOSHI ,  YAGI MASAHIRO

IPC: B32B27/36 ,  C08J5/18 ,  C08J7/04 ,  G11B5/73 ,  G11B5/733 ,  B32B27/20

CPC classification number: B32B27/36 ,  B32B15/09 ,  B32B2307/208 ,  B32B2367/00 ,  B32B2429/02 ,  C08J7/047 ,  C08J2367/02 ,  G11B5/733 ,  Y10T428/24405

Abstract: A polyester film for recording medium, having one major surface thereof provided with a coating containing fine particles of 5 to 60 nm diameter and an organic compound, wherein the number of fine surface projections existing on the coating surface is in the range of 3 million to 100 million /mm2, and the number of surface defects of 120 nm or greater height attributed to foreign matter contained in the film is 30 /100 cm2 or less, and wherein the polyester contains a titanium compound substantially not having any particle diameter. Thus, there are provided a magnetic recording tape for digital data recording that can reduce dropouts and excels in durability, and further provided a polyester film that is suitable as a base film thereof.

公开(公告)号：JP2003248919A

公开(公告)日：2003-09-05

申请号：JP2002049604

申请日：2002-02-26

Applicant: TORAY INDUSTRIES

Inventor： ONO MASAAKI ,  OKAMOTO KATSUYA ,  FUKADA KAZUYOSHI

IPC: G11B5/733 ,  G11B5/73

Abstract: PROBLEM TO BE SOLVED: To provide a polyester film of a magnetic recording medium to manufacture a magnetic tape which is less abrading to MR heads, excellent in tape run and durability with less dropouts and used in digital recording with a track pitch 6 μm or less. SOLUTION: This polyester film of a magnetic recording medium has a film containing fine particles and organic chemicals on its one surface A, and this film has fine projections of the above fine particles on its surface. The number of the fine projections is 500 to 9000 million/mm 2 with their diameter (D) of 20 to 100 nm and their height (H) of 10 to 30 nm, and the density of the projections is 10% or less. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2003126620A

公开(公告)日：2003-05-07

申请号：JP2001330498

申请日：2001-10-29

Applicant: TORAY INDUSTRIES

Inventor： HATANO HIROSHI ,  MUKAI TAKANORI ,  ONO MASAAKI

IPC: B01D29/39 ,  B01D35/02 ,  B29C55/12

Abstract: PROBLEM TO BE SOLVED: To provide a filtering apparatus for a polyester suppressing the pyrolysis of the polyester at the time of filtering, and to provide a method for enhancing the productivity of a polyester stretched film. SOLUTION: A large number of leaf disk filters are housed in casing laminated with multi-layer. A molten polyester flows through the space between the inner surface of the casing and the leaf disk filters, and is filtered through the leaf disk filters. In this filtering apparatus, the flow resistance of the leaf disk filters to the molten polyester is 1.3 times or less the average of the flow resistance of the housed leaf disk filters.

公开(公告)号：JP2003123238A

公开(公告)日：2003-04-25

申请号：JP2001319506

申请日：2001-10-17

Applicant: TORAY INDUSTRIES

Inventor： ONO MASAAKI ,  OKAMOTO KATSUYA ,  TANAKA HARUMI

IPC: B32B27/36 ,  G11B5/733 ,  G11B5/738

Abstract: PROBLEM TO BE SOLVED: To provide a polyester film for a magnetic recording medium which is adequate for manufacturing a DVC tape having good traveling durability and decreased DOs even if a DLC process speed is increased. SOLUTION: This polyester film for the magnetic recording medium is constituted by forming a film containing fine particles and an organic compound on the surface on one side of the polyester film, in which the fine surface projections by the above mentioned fine particles exist on the surface of the film; the diameter of the fine surface projections is 5 to 100 nm, the number thereof is 3,000,000 to 90,000,000 pieces/mm , the Ra value of the surface A of the film is 1 to 5 nm, the Rmax value is