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US 12,577,336 B2Granted
Polyethylene and method for preparing the same
AssigneeLG Chem, Ltd.
InventorsHyun Mook Jeong, Hee Su Oh, Jiwon Yoon, Yi Young Choi
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Abstract
This invention relates to polyethylene and a method for preparing the same. More specifically, this invention relates to polyethylene that has low melt index, narrow molecular weight distribution, and a high content of high molecular weight components, and thus, exhibits excellent ESCR and tensile strength, and a method for preparing the same.
Claims8
A polyethylene polymer satisfying the following requirements of i) to v):
- i) density measured at 23° C. according to ISO 1183-2 being 0.945 to 0.960 g/cm3;
- ii) a melt flow rate (MFR) measured at 190° C. under load of 2.16 kg according to ASTM D1238 being 0.4 to 2.0 g/10 min;
- iii) a melt flow rate ratio (MFRR) of MFR5/MFR2.16 being 3.0 to 5.0, wherein MFR5 is a melt flow rate measured at 190° C. under load of 5 kg according to ASTM D1238, and MFR2.16 is a melt flow rate measured at 190° C. under load of 2.16 kg according to ASTM D1238;
- iv) a molecular weight distribution (MWD) of Mw/Mn being 7.0 to 15.0, wherein Mw is a weight average molecular weight, and Mn is a number average molecular weight;
- and
- v) an integral value of an area where Log Mw value is 6.0 or more in a gel permeation chromatography (GPC) curve graph being 2.0 to 7.0% of an entire integral value,
- wherein environmental stress crack resistance (ESCR) measured according to ASTM D 1693 is 200 hours or more.
4 more elements
Dependencies are inferred from the claim text.