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US 9,518,341 B2Granted
Method of producing an amorphous polyetherimide fiber and heat-resistant fabric
AssigneeKuraray Co., Ltd.
InventorsRyokei Endo, Yosuke Washitake, Yukie Sugihara, Akihiro Uehata
Life of this patent
Estimating the term…
Abstract
Provided are an amorphous polyetherimide fiber having not only a small single fiber fineness suitable for producing fabrics, and a fabric comprising the amorphous polyetherimide fiber. The fiber comprises an amorphous polyetherimide polymer having a molecular weight distribution (Mw/Mn) of less than 2.5, and having a shrinkage percentage under dry heat at 200° C. of 5% or less, and a single fiber fineness of 3.0 dtex or less. The fiber may have a tenacity at room temperature of 2.0 cN/dtex or greater.
Claims20
A method for producing an amorphous polyetherimide fiber, the method comprising:
- melt-kneading an amorphous polyetherimide polymer having a molecular weight distribution (Mw/Mn) of less than 2.5 to obtain a molten polymer having a predetermined melt viscosity,
- discharging the molten polymer in a predetermined amount from a spinning nozzle having a single hole size of about 0.01 mm2 to about 0.07 mm2, and
- winding the discharged polymer at a predetermined winding rate without drawing to obtain an amorphous polyetherimide fiber having a tenacity at room temperature of 25° C. of 2.0 cN/dtex or greater, a shrinkage percentage under dry heat at 200° C. of 5% or less and a single fiber fineness of 3.0 dtex or less.
Dependencies are inferred from the claim text.