Claims
- 1. An acrylic fiber comprising:a plurality of flat arms radially extending from a center along a longitudinal direction; and a crack with a length of 200 μm or more in the center of its tension rupture lateral surface along the filament axis direction when rupturing the monofilament in a tension test.
- 2. The acrylic fiber as claimed in claim 1, wherein said acrylic fiber consist; ofan acrylonitrile polymer comprising an acrylonitrile unit in at least 80 wt % and less than 95 wt %; and wherein said fiber comprises a monofilament dry strength of 2.0 to 4.0 N/dtex; and a monofilament dry elongation of 15 to 40%.
- 3. The acrylic fiber as claimed in claim 1, wherein said acrylic fiber has a Young's modulus is 5800 N/mm2 or higher.
- 4. The acrylic fiber as claimed in claim 2, wherein said acrylic fiber has a Young's modulus is 5800 N/mm2 or higher.
- 5. The acrylic fiber as claimed in claim 1, wherein a ratio of a/b is 2.0 to 10.0, wherein “a” and “b” are the monofilament length from its center to the tip of the flat arm and the width of the flat arm, respectively.
- 6. The acrylic fiber as claimed in claim 2, wherein a ratio of a/b is 2.0 to 10.0, wherein “a” and “b” are the monofilament length from its center to the tip of the flat arm and the width of the flat arm, respectively.
Priority Claims (3)
Number |
Date |
Country |
Kind |
11-180275 |
Jun 1999 |
JP |
|
11-228496 |
Aug 1999 |
JP |
|
2000-056202 |
Mar 2000 |
JP |
|
Parent Case Info
This application is a Division of application Ser. No. 10/019,026 flied on Dec. 26, 2001 now U.S. Pat. No. 6,610,403, pending, which is the National Stage of PCT/JP00/04127, filed Jun. 23, 2000.
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