Toyo Boseki Kabushiki Kaisha

Yusuke Shimizu

Tetsuo Kodama

Naoki Mizuno

Tooru Kitagawa

Shoichi Gyobu

Yoshihiko Teramoto

Yoshimitsu Sakaguchi

Seiji Watanuki

Hidekazu Yoshida

Syunji Kurahara

Kohei Kiriyama

Hisashi Ubara

Koichi Matsuda

Ken Takasugi

To provide fibers which retain the excellent heat resistance and flame retardancy inherent in polybenzazole fibers and pyridobisimidazole fibers, have improved post-processability and neither necessitate considerable change in production process conditions nor require a high-temperature and long-time heating treatment. With respect to the polybenzazole fiber and pyridobisimidazole fiber, in an electron diffraction diagram of a surface layer part (from the surface to 1 &#x3bc;m) of the fibers, the fibers containing a crystal present in a state satisfying that S2/S1 is in a prescribed range, wherein S1 is a diffraction peak area derived from a crystal (200) plane and S2 is a diffraction peak area derived from a plurality of other crystal planes along an equatorial direction profile.

Polybenzazole fiber and pyridobisimidazole fiber

The present invention provides a polybenzazole article superior in light resistance, which contains a light-resisting agent that allows for a regular reflectance of the article of not more than 30% in not less than 30% of the wavelength region of from 450 nm to 700 nm and a production method thereof. The present invention provides a polybenzazole article having noticeably superior light resistance, which is preferable as industrial materials and fireman's garments, and a production method thereof.

Polybenzazole article and production method thereof

An oxygen-absorbing material including a transition metal compound and one or more thermoplastic resins, when used for a molded product such as container, exhibits excellent gas-barrier and oxygen-absorbing properties. The material absorbs oxygen from contents and blocks oxygen from entering so that the contents can be maintained in an oxygen-free state for a long period of time. An excellent oxygen-absorbing property is achieved by an amino group content of 20 mmol/kg or lower in at least one thermoplastic resin and by lowering the crystallinity of the thermoplastic resin.

Oxygen-absorbing material

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Ohtsu, Japan

Yusuke Shimizu