Toray Industries, Inc.

Toshihiro Tsuzuki

Akimitsu Tsukuda

Masanori Sueoka

Tsutomu Morimoto

Masaaki Ono

Katsuya Okamoto

Takashi Ueda

Toshiya Ieki

Yuzo Shimizu

Mitsuhiro Horiuchi

Tai Sasamoto

Nobuaki Itoh

The present invention provides aromatic polyamide resin moldings comprising at least one surface that is 1.0 nm or more in root-mean-square roughness and is 80 nm or less in 10-point average roughness, both of the roughness being as determined by atomic force microscopy, and that is 9.8 GPa or more in tensile Young's modulus at least in one direction. Such aromatic polyamide resin moldings serve effectively as material for film, film for magnetic recording medium in particular, that is highly resistant to scraping and has highly uniform surface protrusions.

Aromatic polyamide resin moldings, production methods thereof, and magnetic recording medium produced therefrom

A polyester film containing 0.1 to 2.0% by weight of a wax compound formed from an aliphatic carboxylic acid and an aliphatic alcohol or a constituent of the wax compound, and having thereon large protuberances having a maximum diameter of not smaller than 2 &mgr;m at a density of 20 protuberances/mm .

Polyester composition, film made thereof, and magnetic recording medium

Disclosed is a base film that has excellent electromagnetic conversion property over the entire length from a roll core portion to a surface portion of the film product and that is suitable for the production of digital videotapes with reduced dropouts. A polyester film for a magnetic recording medium includes at least a polyester layer A and a polyester layer B laminated. A center-line surface average roughness (SRa value) of a layer A-side surface of the film is 2 nm to 4 nm, and a ten-point average surface roughness (SRz value) of the layer A-side surface is 10 nm to 40 nm. The layer B contains a fine particle &agr; whose average particle size is at least 50 nm and less than 250 nm, and a fine particle &bgr; whose average particle size is at least 250 nm and less than 500 nm. The content of the fine particle &agr; in the layer B is 0.1 wt. % to 1.0 wt. %. The content of the fine particle &bgr; in the layer B is 0.01 wt. % to 0.10 wt. %. A magnetic recording tape is formed by providing a ferromagnetic metal thin film on a layer A-side surface of the polyester film.

Polyester film for magnetic recording medium, and magnetic recording tape

An image transfer material for thermal recording capable of providing a highly precise printing quality suitable for multiple printing operations comprises a base film having, on one of its surfaces a layer of a colouring material. The base film is made of an aromatic polyamide and has a Young's modulus E,in the longitudinal direction, measured at,C. and at a relative humidity of 60%, of at least 6.86 GPa. The base film is in a substantially flat condition and is capable of maintaining a flat condition after having been heat-treated at 200&deg; C. for 10 minutes in the absence of an applied tension.

Image transfer material for thermal recording

Polyester composition and film made therefrom

Aromatic polyamide film, method of manufacturing the same and magnetic

An aromatic polyamide and/or aromatic polyimide film suitable as a support in a magnetic recording medium excellent in runnability and scratch resistance and good in S/N ratio comprises an aromatic polyamide and/or aromatic polyimide as a main component, with particles present in the film, which film has characteristics which satisfy the following formulae:

Aromatic polyamide and/or aromatic polyimide film and magnetic recording

Film made of an aromatic polyamide and/or aromatic polyimide and a

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Kyoto, Japan

Toshihiro Tsuzuki