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US 2017/0321076 A1Published application
Polyethylene composition for having high impact and stress cracking resistance
AssigneeBasell Polyolefine GmbH
InventorsGERHARDUS MEIER, ULF SCHULLER, DIANA DOTSCH, BERND LOTHAR MARCZINKE, HEINZ VOGT
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Abstract
Polyethylene composition with improved balance of impact resistance at low temperatures and Environmental Stress Cracking Resistance (ESCR), particularly suited for producing protective coatings on metal pipes, said composition having the following features: 1) density from 0.938 to 0.948 g/cm3; 2) ratio MIF/MIP from 15 to 25; 3) MIF from 30 to 45 g/10 min.; 4) Mz equal to or greater than 1000000 g/mol; 5) LCBI equal to or greater than 0.55.
Claims20
A polyethylene composition comprising:
- 1) a density from 0.940 to 0.948 g/cm3 as determined according to ISO 1183 at 23° C.;
- 2) a MIF/MIP ratio from 15 to 25, where MIF is the melt flow index at 190° C. with a load of 21.60 kg, and MW is the melt flow index at 190° C. with a load of 5 kg, both determined according to ISO 1133;
- 3) a MIF value from 30 to 45 g/10 min;
- 4) a Mz value equal to or greater than 1000000 g/mol;
- 5) a long-chain branching index, LCBI, equal to or greater than 0.55;
- wherein LCBI is the ratio of the measured mean-square radius of gyration Rg, measured by GPC-MALLS, to the mean-square radius of gyration for a linear PE having the same molecular weight.
3 more elements
Dependencies are inferred from the claim text.