Asahi Kasei Kogyo Kabushiki Kaisha

Hiroshi Tanji

Michitaka Iwata

Hideo Sato

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.

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Fuji, Japan

Hiroshi Tanji