Teijin Limited

Toyoaki Ishiwata

Shunichi Matsumura

Hiroshi Sakurai

Jiro Sadanobu

Takanori Miyoshi

Susumu Honda

Tsutomu Nakamura

Hirotaka Suzuki

Kiyotsuna Toyohara

Nobuaki Kido

Masayuki Chokai

Takao Ohno

Kazuteru Kohno

Toru Hikosaka

Tomonori Sakurai

Hironori Haga

Daisuke Ozaki

A polymetaphenylene isophthalamide-based polymer porous film having a satisfactory porous structure that exhibits excellent gas permeability and heat resistance. It is produced by a process which comprises casting a dope of the polymetaphenylene isophthalamide-based polymer and coagulating it in a coagulating bath. The porous film may also contain inorganic whiskers, and a composite porous film may be formed in combination with a separate thermoplastic polymer film.

Polymetaphenylene isophthalamide-based polymer porous film, process for its production and battery separator

A wholly aromatic polyester carbonate having a good color and excellent heat resistant stability. This polymer had an extremely low alkali metal content of 10 ppm or less. This polymer is advantageously produced by reacting an aromatic dicarboxylic acid, aromatic diol and diaryl carbonate in a specific molar ratio in the presence of a pyridine-based compound as a catalyst.

Wholly aromatic polyester carbonate and process therefor

The present invention relates to a wholly aromatic polyester carbonate and a process for its production. An aromatic dicarboxylic acid, an aromatic diol, and a diaryl carbonate are used as starting materials in specific molar ratios, a prepolymerization step, a crystallization step, and a solid-phase polymerization step are essential steps, and a compression molding step is an optional step. This makes it possible to produce with good productivity a wholly aromatic polyester carbonate that has low coloration and a high degree of polymerization.

Wholly aromatic polyester carbonate and process for production of same

Method for crystallization of low molecular weight polycarbonate and method for preparing polycarbonate resin from it

Resin composition containing crystalline polyimide

A process for producing a wholly aromatic polyester which is excellent in heat resistance, mechanical properties and yet color and has a high degree of polymerization by melt polymerizing a dicarboxylic acid and a diol directly on an industrial scale at a low cost in a short period of time without esterifying the dicarboxylic acid or diol in advance. To produce the wholly aromatic polyester by reacting and molding an aromatic dicarboxylic acid such as terephthalic acid, an aromatic diol such as 2,2-bis(4-hydroxyphenyl)propane and a diaryl carbonate by heating, a combination of a specific pyridine compound and an alkali metal (bi)carbonate, a combination of a specific pyridine compound and an organic tin compound or a specific titanium compound is existent as a catalyst. Thereby, the wholly aromatic polyester having the above properties is obtained.

Wholly aromatic polyester and production process therefor

Elastic fiber, process for the same and polyester elastomer used thereof

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Iwakuni, Japan

Toyoaki Ishiwata