Toray Industries, Inc.

Tai Sasamoto

Shigeru Tanaka

Masatoshi Ohkura

Toshihiro Tsuzuki

Tetsunori Higuchi

Jun'ichi Masuda

Tsutomu Morimoto

Yoshitaka Matsumura

Yuko Harashina

A biaxially stretched polypropylene film of the present invention has high stiffness in the film longitudinal direction and can be manufactured by a conventional longitudinal-transverse sequential biaxial stretching method, since the biaxially stretched polypropylene film comprises a polypropylene which comprises a polypropylene having controlled specific values of a melt strength (MS) and a melt flow rate (MFR) at 230&#xb0; C. or consists of a polypropylene having controlled specific values of a melt strength (MS) and a melt flow rate (MFR) at 230&#xb0; C. and/or a Trouton ratio of the polypropylene is controlled at a specific value, moreover, the biaxially stretched polypropylene film contains regulated longitudinal fibrils.

Biaxially oriented polypropylene film

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

The present specification discloses a hygroscopic polyester copolymer with a hydrophilic compound copolymerized, containing a cross-linking agent and controlled in moisture absorbing and releasing property, and a fiber using the polyester copolymer. The fiber can be used as a comfortable material for underwear, sports wear, interlinings, etc. as highly hygroscopic woven and knitted fabrics, etc. of high quality.

Hygroscopic polyester copolymer, and a hygroscopic fiber made therefrom

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Yokohama, Japan

Tai Sasamoto