US 12,221,497 B2
Polyethylene powder, and molded body thereof
Haruka Yokoyama, Tokyo (JP); and Kazuya Shikata, Tokyo (JP)
Assigned to Asahi Kasei Kabushiki Kaisha, Tokyo (JP)
Appl. No. 18/573,786
Filed by Asahi Kasei Kabushiki Kaisha, Tokyo (JP)
PCT Filed Jun. 23, 2022, PCT No. PCT/JP2022/025030
§ 371(c)(1), (2) Date Dec. 22, 2023,
PCT Pub. No. WO2022/270571, PCT Pub. Date Dec. 29, 2022.
Claims priority of application No. 2021-105354 (JP), filed on Jun. 25, 2021.
Prior Publication US 2024/0239926 A1, Jul. 18, 2024
Int. Cl. C08F 10/02 (2006.01); H01M 50/406 (2021.01); H01M 50/417 (2021.01)
CPC C08F 10/02 (2013.01) [H01M 50/406 (2021.01); H01M 50/417 (2021.01)] 20 Claims
OG exemplary drawing
 
1. A polyethylene powder having a viscosity-average molecular weight of 200,000 or more and 10,000,000 or less, wherein
complex viscosity in step 3 under the following Conditions for Measurement of Slurry Viscoelasticity satisfies the following formula (1):

OG Complex Work Unit Math
|η*|(Tmax): an absolute value of complex viscosity (Pas) at Tmax
|η*|(Tmin): an absolute value of complex viscosity (Pas) at Tmin
Tmax: maximum temperature (° C.) within a range in which the formula (2) is satisfied
Tmin: minimum temperature (° C.) within a range in which the formula (2) is satisfied:

OG Complex Work Unit Math
|η*|: an absolute value of complex viscosity (Pas), T: temperature (° C.)
(Conditions for Measurement of Slurry Viscoelasticity)
measuring apparatus: MARS 11 manufactured by Thermo Fisher Scientific K.K.
stage: 20 mm ϕ
plate: 20 mm ϕ parallel plate
gap: 0.5 mm
slurry composition: 30 parts by mass of a polyethylene powder, 70 parts by mass of a liquid paraffin
polyethylene powder: a powder passing through a sieve having an opening of 425 μm in accordance with a JIS Z 8801 standard is used for measurement
measurement conditions: complex viscosity is measured by the following steps 1 to 3:
step 1 a slurry is kept at 100° C. for 2 min
step 2 after the step 1, temperature is increased from 100° C. to 140° C. at 1° C./min (at a frequency of 1 Hz and a strain of 0.1% under a nitrogen atmosphere)
step 3 after the step 2, temperature is decreased from 140° C. to 100° C. at 1° C./min (at a frequency of 1 Hz and a strain of 0.1% under a nitrogen atmosphere), and complex viscosity with respect to temperature change is measured every 0.5° C.