公开(公告)号：JP2002341114A

公开(公告)日：2002-11-27

申请号：JP2001141920

申请日：2001-05-11

Applicant: TORAY INDUSTRIES

Inventor： NAKAMORI YUKARI ,  TSUNEKAWA TETSUYA ,  NAKAJIMA SHOJI

IPC: G02B5/02 ,  B32B7/02 ,  B32B27/34 ,  B32B27/36 ,  C08J5/18 ,  C08J7/04 ,  C08L67/00 ,  C08L79/08 ,  G02B1/04

Abstract: PROBLEM TO BE SOLVED: To provide a film for a light diffusion plate excellent in heat resistance, planeness and transparency. SOLUTION: The film for a light diffusion plate is a biaxially oriented film comprising a polyimide and a polyethylene terephthalate and has >=80% total light transmittance,

公开(公告)号：JP2001253958A

公开(公告)日：2001-09-18

申请号：JP2000064850

申请日：2000-03-09

Applicant: TORAY INDUSTRIES

Inventor： NAKAMORI YUKARI ,  NAKAJIMA SHOJI ,  TSUNEKAWA TETSUYA

IPC: B41M5/382 ,  B32B27/36 ,  B41M5/40 ,  B41M5/41 ,  C08J5/18 ,  C08K3/00 ,  C08K5/00 ,  C08L67/02 ,  G11B5/73 ,  G11B5/733

Abstract: PROBLEM TO BE SOLVED: To provide a base film giving a magnetic recording tape which gives excellent durability to a MR head on the reproduction of recorded pictures and has an excellent traveling property and excellent durability of the film surface on the side of the magnetic surface. SOLUTION: This biaxially oriented polyester film having many fine protrusions formed on the ground surface portions, characterized in that the fine protrusions contain the protrusions having heights of 3 to 5 nm in the total protrusion number of 3,000,000 to 100,000,000 protrusions/mm2 and in that the average size of grains is 10 to 100 nm, when the height threshold value of the protrusions is 3 nm. The biaxially oriented polyester film is a monolayered film or a bi- or more-layered laminated film.

公开(公告)号：JP2000326468A

公开(公告)日：2000-11-28

申请号：JP2000073474

申请日：2000-03-16

Applicant: TORAY INDUSTRIES

Inventor： KUBOTA HIROSHI ,  OKAZAKI IWAO ,  NAKAJIMA SHOJI

IPC: B32B27/36 ,  G11B5/73 ,  G11B5/733

Abstract: PROBLEM TO BE SOLVED: To provide a biaxially oriented polyester film which shows an extremely low degree of a dropout and an oligomer deposition on the surface of a film and is useful for a magnetic recording medium featuring an excellent handing property and a resistance to the chipping of a tape edge. SOLUTION: This laminated polyester film has a film layer (a layer A) which is composed mainly of at least one polymer selected from among a polypropylene terephthalate, a polypropylene naphthalate, a polybutylene terephthalate and a polybutylene naphthalate, formed on at least one of the surface layers. This film is characterized in that the Young's modulus in the width direction is 6 GPa or more and the Young's modulus in the width direction is higher by 1 GPa or more than the Young's modulus in the longitudinal direction and the number of coarse protrusions Hl on the surface of the film is 200 pcs or less/100 cm2.

公开(公告)号：JP2000094616A

公开(公告)日：2000-04-04

申请号：JP26961198

申请日：1998-09-24

Applicant: TORAY INDUSTRIES

Inventor： OKAZAKI IWAO ,  NAKAJIMA SHOJI ,  KUBOTA HIROSHI

IPC: B32B27/36 ,  G11B5/73

Abstract: PROBLEM TO BE SOLVED: To provide a biaxially oriented polyester film having excellent high output properties for use especially in digital video and high-density data. SOLUTION: This biaxially oriented polyester film is constituted of at least, a two layer structure that at least, it outermost layer (layer A) has 0.1-10 nm surface roughness Ra, 30-50% of crystallinity, 2.0% or less of quantity of extracted oligomer and 0.7 or more of polymer IV respectively of the layer A. Since this biaxially oriented polyester film is of at least a two-layer structure, and the polymer characteristic of at least one outermost layer of the film is specified, excellent output characteristic are obtained, so excellent characteristics sufficient for high density magnetic recording medium can be obtained.

公开(公告)号：JPH11228677A

公开(公告)日：1999-08-24

申请号：JP3126398

申请日：1998-02-13

Applicant: TORAY INDUSTRIES

Inventor： OKAZAKI IWAO ,  NAKAJIMA SHOJI ,  NAKAMORI YUKARI

IPC: C08J5/18 ,  C08G63/183 ,  C08L67/02

Abstract: PROBLEM TO BE SOLVED: To obtain a polyethylene terephthalate capable of forming fine projections without using externally added particles, and useful for a formed product such as a film excellent in abrasion resistance. SOLUTION: This polyethylene terephthalate has a melting peak at >=290 deg.C, and is obtained, for example, by polymerizing ethylene glycol and dimethyl terephthalate to provide a polymer having

公开(公告)号：JPH11188825A

公开(公告)日：1999-07-13

申请号：JP35810597

申请日：1997-12-25

Applicant: TORAY INDUSTRIES

Inventor： NAKAMORI YUKARI ,  OKAZAKI IWAO ,  NAKAJIMA SHOJI

IPC: B32B27/36 ,  G11B5/66 ,  G11B5/73 ,  G11B5/733

Abstract: PROBLEM TO BE SOLVED: To manufacture a biaxially oriented laminate polyester film of metal film type of digital recording process of superior traveling properties, good dispersion properties and compatibility in a fine particle film in which deterioration by heat following the increase of deposition speed is not generated in a process of forming a metal film layer. SOLUTION: A biaxially oriented laminate polyester film is constituted of at least three laminated layers of A/B/C, and a layer A constituting the side on which a magnetic layer is formed is composed of polyester constituted of silicon, aluminum and at least one kind of alkali metals as main components, and containing a 0.005-5 wt.% composite oxide of 0.005-1.0 μm average particles diameter which 1satisfies the formula of Al2 O3 /SiO2 +Al2 O3

公开(公告)号：JPH11188824A

公开(公告)日：1999-07-13

申请号：JP35810497

申请日：1997-12-25

Applicant: TORAY INDUSTRIES

Inventor： NAKAMORI YUKARI ,  OKAZAKI IWAO ,  NAKAJIMA SHOJI

IPC: B32B27/36 ,  G11B5/66 ,  G11B5/73 ,  G11B5/733

Abstract: PROBLEM TO BE SOLVED: To manufacture a biaxially oriented laminate polyester film for a magnetic recording medium of superior output characteristics of dealing with the further speed-up in the manufacturing process and being free from oligomers and surface defects in the case of using a metal film tape of digital recording type for which particularly high performance is required. SOLUTION: A biaxially oriented laminate polyester film is constituted of at least three laminated layers of A/B/C, and a layer C constituting the side on which a magnetic layer is not formed contains a composite oxide composed of silicon, aluminum and at least one kind of alkali metals as main components, and the composite oxide is composed of polyester containing 0.1-5 wt.% particles of 0.05-2.0 μm average particle diameters which satisfies the formula of Al2 O3 /(SiO2+Al2 O3 )

公开(公告)号：JP2567964B2

公开(公告)日：1996-12-25

申请号：JP350390

申请日：1990-01-12

Applicant: TORAY INDUSTRIES

Inventor： NAKAJIMA SHOJI ,  ABE KOICHI ,  OKAZAKI IWAO

IPC: B32B27/18 ,  B32B27/36 ,  C08K7/00 ,  C08L101/00 ,  G11B5/73 ,  G11B5/733 ,  G11B5/704

公开(公告)号：JP2555717B2

公开(公告)日：1996-11-20

申请号：JP29906588

申请日：1988-11-26

Applicant: TORAY INDUSTRIES

Inventor： OKAZAKI IWAO ,  ABE KOICHI ,  NAKAJIMA SHOJI

IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L9/00 ,  B32B27/36 ,  C08J5/18 ,  C08L67/02

公开(公告)号：JPH08245813A

公开(公告)日：1996-09-24

申请号：JP32046795

申请日：1995-12-08

Applicant: TORAY INDUSTRIES

Inventor： ABE KOICHI ,  OKAZAKI IWAO ,  NAKAJIMA SHOJI

IPC: C08J5/18 ,  B29C55/12 ,  B29K67/00 ,  B29K105/16 ,  B29L7/00 ,  C08K3/00 ,  C08L67/02 ,  C08L101/00

Abstract: PURPOSE: To provide a film having a low coefficient of friction and improved in wearing resistance and handleability by extruding a thermoplastic resin containing inert particles into a sheet and biaxially stretching the sheet. CONSTITUTION: A thermoplastic resin (a) is melt-kneaded together with 0.001-0.3wt.% spherical inert particles having an average particle diameter of 5-2,000nm, an aspect ratio of 1.0-1.3, and a relative standard deviation of 0.6 or lower. The mixture is extruded into pellets containing the inert particles. These pellets are melted at a temp. not lower than the m.p. of the resin (a) but not higher than the decomposition point thereof, and are extruded into a sheet together with a thermoplastic resin not containing inert particles to obtain an unstretched film. This film is stretched in an areal stretch ratio of 9 or higher and then heated at 140-280 deg.C for 0.5-60sec. Thus, the objective film is obtained in which the average height of surface projections on at least one side is 10nm or larger and is 1/4 to 1/3 of the average particle diameter (b) of the inert particles and the number of projections having a height not higher than 1/3 of the diameter (b) accounts for 40-80% of the total number of all projections.