Title:
ULTRAFINE FIBER AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3224879
Kind Code:
B2
Abstract:
PURPOSE: To obtain ultrafine fiber, good in level dyeing properties and capable of remarkably improving the dyeing speck on the surface which has conventionally been considered as a disadvantage in a knitted or a woven fabric with hardly any yarn unevenness and to provide a method for producing the ultrafine fiber with hardly any fluff at a low cost.
CONSTITUTION: This method for producing ultrafine fiber, having $ 0.3 denier single filament size and composed of a polyester prepared by reacting a bifunctional carboxylic acid consisting essentially of terephthalic acid with ethylene glycol is to melt the polymer having an intrinsic viscosity [η] regulated to 0.3-0.6 and then melt spin the fiber at ≥1500 to ≤3500m/min take-off speed. The ultrafine fiber is characterized in that the intrinsic viscosity [η] is 0.3-0.6; the dynamic loss tangent (tanδ) is tanδ40=0.05-0.045, tanδ60=0.044--0.036 and tanδ80=0.035-0.03; the apparent crystal size in (110) face in a wide angle X-ray diffractometry is ≥55&angst ; the crystal growth degree is ≥0.25 and the crystallinity is ≥55%.
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Inventors:
Keiji Yamashita
Fumio Matsuda
Fumio Matsuda
Application Number:
JP31718192A
Publication Date:
November 05, 2001
Filing Date:
November 26, 1992
Export Citation:
Assignee:
ASAHI KASEI KABUSHIKI KAISHA
International Classes:
D01D5/08; D01F6/62; (IPC1-7): D01F6/62
Domestic Patent References:
| JP54156814A | ||||
| JP56332A | ||||
| JP56123409A | ||||
| JP61186515A | ||||
| JP564715A |