Asahi Kasei Kogyo Kabushiki Kaisha

Tetsuo Matsushita

Seiichi Manabe

Takashi Fujiwara

Shuji Kajita

Hiroshi Suzuki

Shigemitsu Muraoka

Eiji Satoh

Tamio Ishitobi

Keisaku Nagasawa

Atsushi Ishida

Masashi Mitsuishi

A high Young's modulus poly-p-phenylene-terephthalamide fiber having a unique fine-structure and excellent properties, including excellent resistance to lateral stress and to friction. The fiber is made by extruding an anisotropic dope in a non-coagulating layer, passing the extrudate through a coagulating layer, washing and drying the resulting coagulated fibers in the absence of substantial tension, and heating the fibers under tension.

Process for the preparation of high Young's modulus

A poly-p-phenylene-terephthalamide fiber with excellent fatigue resistance resulting from a unique combination of properties. The fibers are prepared by extruding an anisotropic polymer dope in a non-coagulating layer, passing the extrudate through a coagulating layer, depositing the resulting coagulated fibers on a net conveyor, and in the absence of substantial tension sequentially washing the fibers, holding the fibers in saturated steam, and drying the fibers under specified conditions.

Process for the preparation of fibers of poly-p-phenylene-terephthalamide

High Young's modulus poly-p-phenylene terephthalamide fiber

Poly-p-phenylene-terephthalamide fibers excellent in fatigue resistance

There is provided a shaping composite dope composition comprising a cellulose derivative, an acrylonitrile polymer and a solvent capable of substantially dissolving these polymeric materials simultaneously therein, and exhibiting flow birefringence or optical anisotropy. A composite fiber made from the dope has a strucute such that the cellulose derivative is present in the form of a dispersed phase of fine fibers in a matrix of the acrylonitrile polymer, the crystalline orientation angle of the acrylonitrile polymer phase is 18.degree. to 63.degree. as measured by wide angle X-ray diffractiometry, and the ratio of the crystalline orientation angle of the cellulose derivative phase to the crystalline orientation angle of the acrylonitrile polymer phase satisfies a specified requirement. The composite fiber is excellent in the thermal dimensional stability and mechanical properties, such as tensile strength and tensile elongation and loop strength and loop elongation.

Polymer dope composition, composite fibers made therefrom and process

A process for manufacturing fibers by a wet spinning procedure from an anisotropic dope of a polymer having aromatic mononucleus or polynucleus divalent radicals in which the chain extending bonds from each aromatic nucleus are coaxial or parallel and oppositely directed and which are connected by at least one link selected from --NHCO--, --NHCOCONH-- and --CONHNHCO-- is provided. The filaments taken out from a coagulation bath are, without applying any substantial tension thereto, washed with water, dried and optionally heat-treated, on a conveyor. The resulting fibers possess moderate initial modulus and elongation as well as high tenacity.

Process for manufacturing aromatic polymer fibers

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Miyazaki, Japan

Tetsuo Matsushita