Polyethylene Powder for Fiber, Fiber, and Article

• US 20150299903A1
• Filed: 04/17/2015
• Published: 10/22/2015
• Est. Priority Date: 04/18/2014
• Status: Active Grant

• Current Assignee: Asahi Kasei Chemicals Corporation (Asahi Kasei Corporation)
• Original Assignee: Asahi Kasei Chemicals Corporation (Asahi Kasei Corporation)
• Inventors: Tanaka, Kenya, Fujiwara, Akio
• Granted Patent: US 10,597,796 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C08F 110/02 Ethene
• CPC Class Codes: C08F 2500/17 Viscosity
• CPC Class Codes: C08F 4/6546 organo-magnesium compounds
• CPC Class Codes: C08F 4/6592 containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring
• CPC Class Codes: D01F 6/04 from polyolefins
• CPC Class Codes: D10B 2321/021 polyethylene

Abstract

An object of the present invention is to provide a polyethylene powder for a fiber which is excellent in the color tone of an obtained article and allows an obtained fiber to be highly drawn, and a fiber and an article made of the polyethylene powder for a fiber. The present invention provides a polyethylene powder for a fiber, wherein the intrinsic viscosity measured at 135° C. in decalin is 10 dL/g or higher and 40 dL/g or lower, the total amount of Al, Mg, Ti, Zr, and Hf is 1.0 ppm or higher and lower than 15 ppm, the amount of a particle having a particle size exceeding 355 μm is 2.0% by mass or lower, and the amount of a particle having a particle size of 75 μm or smaller is 3.0% by mass or higher and 50.0% by mass or lower.

Claims

1. A polyethylene powder for a fiber, wherein

an intrinsic viscosity measured at 135°

C. in decalin is 10 dL/g or higher and 40 dL/g or lower,

a total amount of Al, Mg, Ti, Zr, and Hf is 1.0 ppm or higher and lower than 15 ppm,

an amount of a particle having a particle size exceeding 355 μ

m is 2.0% by mass or lower, and

an amount of a particle having a particle size of 75 μ

m or smaller is 3.0% by mass or higher and 50.0% by mass or lower.

2. The polyethylene powder for the fiber according to claim 1, wherein a total amount of chlorine is 20 ppm or lower.

3. The polyethylene powder for the fiber according to claim 1, wherein a total amount of Fe, Ni, Cu, Cr, and Mo is 3.0 ppm or lower.

4. The polyethylene powder for the fiber according to claim 1, wherein an average particle size is 50 μ

m or larger and 200 μ

m or smaller.

5. The polyethylene powder for the fiber according to claim 1, wherein a tap density is 0.50 g/cm³ or higher and 0.65 g/cm³ or lower.

6. The polyethylene powder for the fiber according to claim 1, wherein a powder flowability is 40 seconds or less.

7. The polyethylene powder for the fiber according to claim 1, comprising an ethylene homopolymer.

8. The polyethylene powder for the fiber according to claim 1, wherein an amount of a volatile component is 0.30% by mass or lower.

9. A fiber which is obtained using the polyethylene powder for the fiber according to claim 1.

10. The fiber according to claim 9, comprising an antioxidant, wherein

an amount of the antioxidant is 100 ppm or higher and 5000 ppm or lower.

11. An article comprising the fiber according to claim 9, the article being selected from the group consisting of ropes, nets, bulletproof clothing, protective clothing, protective gloves, fiber-reinforced concrete products, and helmets.