Teijin Limited

Teijin Techno Products Limited

Anton Peter De Weijer

Hiroaki Kuwahara

Masayuki Chokai

Shunichi Matsumura

Dennis Wilbers

This invention is to provide a dope that has excellent formability and can be formed into a fiber, a film, pulp-shaped particles and the like by a wet method. This invention is also to provide a process for the production of a fiber excellent in heat resistance, strength and elastic modulus. This invention provides a dope and a process for the production of a fiber from the dope, the dope including a polyamide and a basic solvent, the polyamide containing a recurring unit of the following formula (I), wherein Arrepresents at least one substituent selected from the group consisting of and having an inherent viscosity of 1.0 or more, the dope has a polyamide concentration of over 10% by weight but not more than 25% by weight and exhibits optical anisotropy at 50&#xb0; C.

Dope and process for the production of fiber from the dope

There are provided a rigid heterocyclic polymer comprising rigid recurring units such as units represented by the following formulae (a) and (b): wherein X is O, S or NH,a production process thereof, and fibers comprising the polymer.

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Iwakuni, Japan

Anton Peter De Weijer