公开(公告)号：DE3884549T2

公开(公告)日：1994-05-11

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：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：DE3573903D1

公开(公告)日：1989-11-30

申请号：DE3573903

申请日：1985-07-04

Applicant: TORAY INDUSTRIES

Inventor： OIKAWA TATUO ,  IZASA TAKAO ,  OKABE KAZUO -

IPC: B32B27/36 ,  C08G63/688 ,  C08J5/12 ,  C08J7/04 ,  G03C1/795

Abstract: PCT No. PCT/JP85/00379 Sec. 371 Date Mar. 7, 1986 Sec. 102(e) Date Mar. 7, 1986 PCT Filed Jul. 4, 1985 PCT Pub. No. WO86/00572 PCT Pub. Date Jan. 30, 1986.The present invention relates to an easily-adhesive polyester film comprising a polyester base film and a coating layer formed on one surface of the polyester base film, the coating layer comprising a mixture composed mainly of a higher fatty acid wax and a copolyester comprising as one comonomer component an alkali metal salt of an ester-forming aromatic sulfonic acid. The film of the present invention has excellent adhesiveness and has an improved anti-blocking property, and the film of the present invention is valuable as a base film for a magnetic recording medium, a capacitor or a photographic film.

公开(公告)号：EP0188620A4

公开(公告)日：1987-01-20

申请号：EP85903381

申请日：1985-07-04

Applicant: TORAY INDUSTRIES

Inventor： OIKAWA TATUO ,  IZASA TAKAO ,  OKABE KAZUO - AZA-WAKAMIYA

IPC: B32B27/36 ,  C08G63/688 ,  C08J5/12 ,  C08J7/04 ,  G03C1/795

CPC classification number: C08J5/124 ,  C08J7/047 ,  C08J2367/02 ,  C08J2423/02 ,  G03C1/7954 ,  Y10S428/90 ,  Y10T428/31786

Abstract: An easily bondable polyester film comprising a polyester base film having on one side a coating layer of a mixture mainly composed of a copolyester containing ester-forming alkali metal aromatic sulfonate as one comonomer and a higher fatty acid wax. This film has excellent bondability and improved blocking properties, and is useful as base film for a magnetic recording medium, capacitor, photographic film, etc.