Asahi Kasei Kogyo Kabushiki Kaisha

Hideo Sato

Michitaka Iwata

Hiroshi Tanji

Toshio Iwasa

Yoshihisa Shichijo

Yasuo Uchida

A nylon 66 fiber capable of being uniformly dyed is made by extruding a melt of nylon 66, passing the extruded filaments through a heating zone provided at the surface of the extrusion nozzle and having a length of at least about 5 cm to about 100 cm and a temperature of about 150.degree. C. to about 260.degree. C., applying a suction with an aspirator located below the heating zone, and then winding at a winding speed of at least 6,000 m/min.

Process for the production of uniformly dyeable nylon 66 fiber

A nylon 66 fiber capable of being uniformly dyed and having an initial modulus at 20.degree. C. and a relative humidity of 60% of about 15 g/d to about 65 g/d and a relationship of a peak temperature [T.sub.max (.degree.C.)] at peak of dynamic mechanical loss tangent (tan .delta.) measured with a frequency of 110 Hz and a peak value of the dynamic mechanical loss tangent [(tan .delta.).sub.max ] represented by the equation:

Uniformly dyeable nylon 66 fiber and process for the production thereof

A polyethylene terephthalate fiber capable of being dyed under normal pressure and having an initial modulus of more than 50 g/d, a peak temperature (T max) at peak of dynamic mechanical loss tangent (tan .delta.) measured with a frequency of 110 Hz of about 85.degree. C. to about 110.degree. C., and a peak value of the dynamic mechanical loss tangent ((tan .delta.) max) of about 0.115 to about 0.135. The fiber has a sheathcore structure such that refractive indices are different between an outer layer of the fiber and an inner layer of the fiber, and a local average refractive index distributed symmetrically around the center of the cross section of the fiber. The fiber is made by extruding a dope of polyester, passing the extruded filaments through a heating zone provided at the surface of the extrusion nozzle and having a length of at least about 5 cm and a temperature of about 150.degree. C. to about the melting point of the polymer, applying a vacuum with an aspirator located below the heating zone, and then winding at a winding speed of at least about 5,000 m/min.

Process for the production of a polyester fiber dyeable under normal

A polyethylene terephthalate fiber capable of being dyed under normal pressure and having an initial modulus of more than 50 g/d, a peak temperature (T max) at peak of dynamic mechanical loss tangent (tan .delta.) measured with a frequency of 110 Hz of about 85.degree. C. to about 110.degree. C., and a peak value of the dynamic mechanical loss tangent ((tan .delta.) max) of about 0.115 to about 0.135. The fiber has a sheath-core structure such that refractive indices are different between an outer layer of the fiber and an inner layer of the fiber, and a local average refractive index distributed symmetrically around the center of the cross section of the fiber. The fiber is made by extruding a dope of polyester, passing the extruded filaments through a heating zone provided at the surface of the extrusion nozzle and having a length of at least about 5 cm and a temperature of about 150.degree. C. to about the melting point of the polymer, applying a vacuum with an aspirator located below the heating zone, and then winding at a winding speed of at least about 5,000 m/min.

Polyester fiber dyeable under normal pressure and process for the

Modacrylic fibers having excellent flameproof property and retaining the superior whiteness, heat-stability, etc. of Acrylonitrile polymer fibers are produced from the polymers containing, as principal components, 50 percent by weight or more of acrylonitrile, 25 percent by weight of more of vinylidene chloride and 0.1 - 3 percent by weight of bis(2-chloroethyl) vinylphosphonate, and if necessary, as additional component, at least one copolymerizable ethylenically unsaturated compound.

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Nobeoka, Japan

Hideo Sato