Ultra-high molecular weight polyethylene powder and ultra-high molecular weight polyethylene fiber

Patent metadata

Field	Value
Publication number	US-10808108-B2
Application number	US-201816215765-A
Country	US
Kind code	B2
Filing date	Dec 11, 2018
Priority date	Dec 14, 2017
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

The present invention provides an ultra-high molecular weight polyethylene powder having a viscosity-average molecular weight of 10×10 4 or higher and 1000×10 4 or lower, wherein a temperature range in which a torque value reaches ½ of the maximum torque value is 150° C. or higher and 170° C. or lower in torque value measurement.

First claim

The invention claimed is:

1. An ultra-high molecular weight polyethylene powder having a viscosity-average molecular weight of 10×10 4 or higher and 1000×10 4 or lower, wherein
a temperature range in which a torque value reaches ½ of the maximum torque value is 150° C. or higher and 170° C. or lower in torque value measurement under the following <kneading condition>:

<kneading condition>
raw material:
a mixture containing 5 parts by mass of the ultra-high molecular weight polyethylene powder and 95 parts by mass of liquid paraffin based on 100 parts by mass in total of the ultra-high molecular weight polyethylene powder and the liquid paraffin, torque value measurement condition:
the raw material is kneaded at 130° C. for 30 minutes and then further kneaded at 240° C. for 15 minutes;
a heating rate from 130° C. to 240° C. is set to 22° C./min;
a rotation number of a screw is set to 50 rpm; and
the measurement is performed under a nitrogen atmosphere.

2. The ultra-high molecular weight polyethylene powder according to claim 1 , wherein the ultra-high molecular weight polyethylene powder has
D10/D50 of 0.40 or more,
D90/D50 of 2.0 or less, and
D50 of 80 μm or larger and 250 μm or smaller.

3. The ultra-high molecular weight polyethylene powder according to claim 1 , wherein a content of an ultra-high molecular weight polyethylene powder particle of 53 μm or smaller is 5% by mass or more and 45% by mass or less.

4. The ultra-high molecular weight polyethylene powder according to claim 1 , wherein the ultra-high molecular weight polyethylene powder has Tm1 of 130° C. or higher and 150° C. or lower in differential scanning calorimeter (DSC) measurement.

5. The ultra-high molecular weight polyethylene powder according to claim 1 , wherein an amount of silicon remaining in the ultra-high molecular weight polyethylene powder is 1 ppm or more.

6. An ultra-high molecular weight polyethylene fiber prepared by spinning an ultra-high molecular weight polyethylene powder according to claim 1 .

Assignees

• Asahi Chemical Ind

Inventors

• Tsujimoto Koichi

Classifications

• C08F10/02

  Ethene · CPC title

• C08L91/06

  Waxes · CPC title

• C08J2323/06

  Polyethene · CPC title

• C08L23/0815

  with aliphatic 1-olefins containing one carbon-to-carbon double bond · CPC title

• D01F6/30

  comprising olefins as the major constituent · CPC title