Method of making polyimide fiber assembly
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United States of America Patent
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Apr 11, 2017
Grant Date -
Sep 16, 2010
app pub date -
Oct 20, 2008
filing date -
Oct 26, 2007
priority date (Note) -
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Abstract
A polyimide fiber assembly of the present invention includes polyimide fibers having curved shapes with an average fiber diameter falling within a range of greater than 1 μm to not greater than 100 μm, the polyimide fiber assembly having a bulk density falling within a range of not less than 1 kg/m3 to not greater than 30 kg/m3. This makes it possible to realize a polyimide fiber assembly that is both excellent in thermal insulation performance and sound absorbency and light in weight. The polyimide fiber assembly of the present invention can be obtained by a production method comprising the steps of: (i) discharging a polymeric resin solution obtained by dissolving polyamic acid or polyimide in an organic solvent; and (ii) using external force to cause the polymeric resin solution thus discharged to fly in a direction of the external force, the external force being external force of gas from a direction intersecting with a discharge direction in which the polymeric resin solution is discharged, and then forming a polymeric resin into fibers by spinning while vaporizing the organic solvent contained in the polymeric resin solution.
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