Polyethylene powder
The present invention provides a polyolefin powder including a homopolymer of ethylene or a copolymer of ethylene and an α-olefin having 3 to 15 carbon atoms.
1. A polyolefin powder comprising a homopolymer of ethylene or a copolymer of ethylene and an α-olefin having 3 to 15 carbon atoms, wherein
the polyolefin powder has a viscosity-average molecular weight of 800,000 to 13,000,000,
a ratio (Mv 75 /Mv 250 ) of a viscosity-average molecular weight (Mv 75 ) of a pass-powder in a classification of the polyolefin powder through a screen mesh having an aperture size of 75 μm to a viscosity-average molecular weight (Mv 250 ) of an on-powder in the classification thereof through a screen mesh having an aperture size of 250 μm is 0.7 to 1.4,
a ratio (BD 75 /BD 250 ) of a bulk density (BD 75 ) of a pass-powder in the classification of the polyolefin powder through a screen mesh having an aperture size of 75 μm to a bulk density (BD 250 ) of an on-powder in the classification thereof through a screen mesh having an aperture size of 250 μm is 0.7 to 1.4, and
the polyolefin powder has an average particle size of 200 μm or smaller.
2. The polyolefin powder according to claim 1 , wherein the Mv 75 /Mv 250 is 0.8 to 1.2.
3. The polyolefin powder according to claim 1 , wherein the Mv 75 /Mv 250 is 0.9 to 1.1.
4. The polyolefin powder according to claim 1 , wherein the BD 75 /BD 250 is 0.8 to 1.2.
5. The polyolefin powder according to claim 1 , wherein the BD 75 /BD 250 is 0.9 to 1.1.
6. A fiber which is produced from the polyolefin powder according to claim 1 .
7. A fiber which is produced from the polyolefin powder according to claim 2 .
8. A fiber which is produced from the polyolefin powder according to claim 3 .
9. A fiber which is produced from the polyolefin powder according to claim 4 .
10. A fiber which is produced from the polyolefin powder according to claim 5 .
11. The polyolefin powder according to claim 2 , wherein the Mv 75 /Mv 250 is 0.9 to 1.1.
12. The polyolefin powder according to claim 2 , wherein the BD 75 /BD 250 is 0.8 to 1.2.
13. The polyolefin powder according to claim 2 , wherein the BD 75 /BD 250 is 0.9 to 1.1.
14. The polyolefin powder according to claim 3 , wherein the BD 75 /BD 250 is 0.8 to 1.2.
15. The polyolefin powder according to claim 3 , wherein the BD 75 /BD 250 is 0.9 to 1.1.
16. The polyolefin powder according to claim 4 , wherein the BD 75 /BD 250 is 0.9 to 1.1.