US 12,006,378 B2
Polyethylene and its chlorinated polyethylene
Cheolhwan Jeong, Daejeon (KR); Si Jung Lee, Daejeon (KR); Sun Mi Kim, Daejeon (KR); Ue Ryung Seo, Daejeon (KR); Yi Young Choi, Daejeon (KR); and Bog Ki Hong, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/294,896
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Sep. 25, 2020, PCT No. PCT/KR2020/013051
§ 371(c)(1), (2) Date May 18, 2021,
PCT Pub. No. WO2021/060907, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 10-2019-0120102 (KR), filed on Sep. 27, 2019; application No. 10-2019-0120103 (KR), filed on Sep. 27, 2019; and application No. 10-2020-0123878 (KR), filed on Sep. 24, 2020.
Prior Publication US 2022/0017663 A1, Jan. 20, 2022
Int. Cl. C08F 110/02 (2006.01); C08F 4/02 (2006.01); C08F 4/6592 (2006.01); C08F 8/20 (2006.01)
CPC C08F 110/02 (2013.01) [C08F 4/02 (2013.01); C08F 4/65922 (2013.01); C08F 8/20 (2013.01); C08F 2420/00 (2013.01)] 11 Claims
 
1. A polyethylene having a density of 0.945 g/cm3 or more when measured in accordance with ASTM D-1505,
wherein a fraction of an area representing a high molecular weight content of log Mw>6.0 is 4 to 12%,
a fraction of an area representing a medium molecular weight content of 4.5<log Mw<5.0 is 35 to 50%, and
a fraction of an area representing a low molecular weight content of log Mw<4.0 is 10% or less,
relative to a total area of a molecular weight distribution curve drawn with a log value of weight average molecular weight as the x axis and a molecular weight distribution with respect to the log value as the y axis using gel permeation chromatography, and
an entanglement molecular weight (Me) of the following Equation 1 is from 27,000 to 52,000 g/mol:
Me=(ρRT)/GN0  [Equation 1]
wherein
ρ is a density (kg/m3) of polyethylene measured in accordance with ASTM D-1505×0.8,
R is a gas constant of polyethylene of 8.314 Pa·m3/mol·K,
T is an absolute temperature of the measured temperature, and
GN0 is a plateau modulus of polyethylene, which is a storage modulus when a loss modulus has a minimum value in a region where the storage modulus is greater than the loss modulus, wherein the storage modulus and loss modulus are measured while changing an angular frequency to 0.05 to 500 rad/s under conditions of 190° C. and 0.5% strain using a rotary rheometer.