Toray Industries, Inc.

Masatoshi Aoyama

Masaru Suzuki

Masahiro Kimura

Koichi Abe

Minoru Yoshida

Jun Sakamoto

Hiroji Kojima

Yukari Nakamori

Iwao Okazaki

Keisuke Honda

Kenichi Tsutsumi

Xin Zeng

Yong Gen He

Katsuya Okamoto

Hidehito Minamizawa

Jing Lu

Tatsuya Nagano

Yuzo Shimizu

Hiroyuki Tanaka

Toshiaki Ueda

Hitoshi Yoshimura

Toshihiro Sasaki

Kunihiro Morimoto

Yoshihiro Honma

Pujing Zuo

Minoru Fujimori

Xiaji Dai

Minoru Uchida

Xiangqun Fan

Zinong Ye

Keisuke Oshima

Nobuyuki Kagami

Yoshihiro Toray Mishima-Ryo E-416 Honma

A solid-phase polymerization method of high-molecular-weight aliphatic polyester conducts the solid-phase polymerization of aliphatic polyester prepolymer under a gas stream containing sulfonic acid catalyst. The method features preparing metal free aliphatic polyester with high molecular weight, good color and luster and perfect thermal stability efficiently. The non-metal-ion aliphatic polyester is not only applicable to common use, but is also suitable as high value-added medical material and packing material which contacts with food directly than other metal-containing polyester.

Solid-phase polymerization method for preparing high-molecular-weight aliphatic polyester

A polyester composition produced without using an antimony compound as a polycondensation catalyst and including

Polyester resin compositions, catalyst for polyester production, polyester film, and magnetic recording medium

In a polyester production method, a titanium compound having a radical selected from a carbonyl group, a carboxyl group, or an ester group, and a phosphorous compound having a structure illustrated in Formula (I), are added  This yields a polyester composition which does not exhibit increased filter pressure when forming, which has excellent filament and film forming properties, and which has a polymer color tone superb to that of conventional products.

Polyester production method, polyester composition, and polyester fiber

Polyester composition and film, and production method

Polyester polymerization catalyst, a production method thereof, and a

Thermoplastic polyester composition and film made therefrom

Polyester composition and films produced therefrom

A polyester composition comprises a polyester component (a) and polymer particles (b). At least an outermost layer of the polymer particles (b) is of a polymer having hydroxyl groups. The composition can be made into a film especially suitable for use as a substrate in a magnetic recording medium.

Polyester composition and film

Polyester composition and film made therefrom

Polyester composition and biaxially oriented polyester film containing

Disclosed is a biaxially oriented film and a laminated film containing specified organic particles at a content of 0.001 to 20% by weight. The strength when deformed by 10% (S.sub.10) of the organic particles is in the range of 3 to 30 kgf/mm.sup.2, the thermal decomposition temperature for causing 10% loss in weight thereof is not lower than 350.degree. C. The weight average diameter thereof is in the range of 0.005 to 5 .mu.m. Since the organic particles have a good affinity with the matrix resin of the film and a good thermal resistance and the hardness of the particles is appropriate, desired protrusions hardly chipped and having an appropriate hardness for hardly scratching a magnetic surface can be formed on a film surface easily and uniformly. Therefore, a film excellent in abrasion resistance and scratch resistance at a high running speed and excellent in running durability can be obtained, which is useful particularly as a base film of a magnetic tape.

Biaxially oriented film comprising organic particles

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Mishima, Japan

Masatoshi Aoyama