Kyoto Institute of Technology

Nitto-Denko Corporation

Teijin Limited

Mitsui Toatsu Chemicals, Incorporated

National University Corporation Kyoto Institute of Technology

Hideki Yamane

Yoshiharu Kimura

Toshio Kitao

Koichi Hashimoto

Hosei Shinoda

Kiyotsuna Toyohara

Daisuke Kitagawa

Takashi Wano

Shin To

Midori Ikegame

Yoshihito Takagi

Daisuke Masaki

Hiroki Nakata

The present invention provides a method for producing a PTFE fiber that makes it possible, unlike the emulsion spinning process, to obtain a polytetrafluoroethylene (PTFE) fiber, particularly a long PTFE fiber, without using a matrix material, is more productive than conventional production methods such as a slit yarn process, and is capable of enhancing mechanical properties and the degree of freedom in diameter of the obtained fiber. The method for producing the PTFE fiber of the present invention includes the step of reducing a diameter of a string-shape PTFE-containing solid material (a first solid material) by drawing the first solid material at a temperature equal to or higher than a melting point of PTFE. The first solid material can be obtained from a PTFE-containing solid material (a second solid material) containing water and a surfactant, by reducing an amount of the water contained in the second solid material.

Method for producing polytetrafluoroethylene fiber and polytetrafluoroethylene fiber

It is an object of the present invention to produce a polylactic acid having a high molecular weight such as a weight average molecular weight (Mw) of more than 100,000 from which only a stereocomplex crystal is grown even by repeating melting and crystallization. The present invention is a process of producing a polylactic acid, including the steps of:

Process of producing polylactic acid

The present invention provides a nylon composition having increased hydrolyzability which is obtained by physically mixing 100 parts by weight of a nylon with 1 to 50 parts by weight of at least one polymer selected from the group consisting of polylactic acid, polyglycolic acid and a copolymer containing 50 mol % or more of a lactic acid unit or a glycolic acid unit as a repeating unit in its chain; and a method for increasing the hydrolyzability of a nylon by preparing such a composition. High hydrolyzability can be imparted to the nylon inherently having extremely low hydrolyzability without impairing its original mechanical strength. Therefore, various molded articles made from the nylon can be hydrolyzed under natural circumstances, and thus the wastes are not stored.

Nylon composition having increased hydrolyzability and method for

An electrically conductive alumina fiber which heretofore known only as electrically insulative is now provided, which comprises an aluminum oxide matrix, and a continuous phase of carbon in the aluminum oxide matrix, the continuous phase of carbon affording an electrically conductive property to the fiber. Also, a method of producing the alumina fiber is disclosed, comprising pyrolyzing a fiber of poly[(acyloxy)aloxane] having a formula ##STR1## wherein, R.sub.1 represents CH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.3, R.sub.2 represents ##STR2## or other substituted aromatic group, in an inert atmosphere.

Alumina fiber with carbon inclusion and a method of producing the same

An electrically conductive alumina fiber which heretofore known only as electrically insulative is now provided, which comprises an aluminum oxide matrix, and a continuous phase of carbon in the aluminum oxide matrix, the continued phase of carbon affording an electrically conductive property to the fiber. Also, a method of producing the alumina fiber is disclosed, comprising pyrolyzing a fiber of poly[(acyloxy)aloxane)] having a formula ##STR1## wherein, R.sub.1 represents CH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.3, R.sub.2 represents ##STR2## or other substituted aromatic group, in an inert atmosphere.

Alumina fiber and a method of producing the same

Growing community of inventors

Kyoto, Japan

Hideki Yamane