FIELD: chemistry.
SUBSTANCE: invention relates to a polyethylene composition suitable for the production of protective coatings for metal pipes, in particular steel pipes, as well as a method for producing a polyethylene composition. Composition has a density of 0.938 to 0.948 g/cm3, MIF/MIP ratio of 15 to 25 and MIF of 30 to 45 g/10 min, where MIF is melt flow index at 190°C with a load weight of 21.60 kg, MIP is melt flow index at 190°C with a load weight of 5 kg. Polyethylene composition has Mz equal to or greater than 1,000,000 g/mol and a long chain branching index (LCBI) equal to or greater than 0.55.
EFFECT: composition of the invention has a high processing speed and/or low moulding temperature, stability of flow characteristics, and an improved balance of impact resistance at low temperatures and environmental stress cracking resistance (ESCR).
12 cl, 1 dwg, 1 tbl, 3 ex
| Title | Year | Author | Number |
|---|---|---|---|
| POLYETHYLENE COMPOSITION FOR BLOW MOULDING HAVING HIGH STRESS CRACKING RESISTANCE | 2014 |
|
RU2656571C2 |
| METHODS FOR PRODUCTION OF POLYETHYLENE AND COMPOSITIONS THEREOF | 2014 |
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| POLYETHYLENE COMPOSITION WITH HIGH RESISTANCE TO STRESS CRACKING | 2015 |
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RU2654479C1 |
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RU2722013C1 |
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| COMPOSITION OF POLYETHYLENE FOR FILM PRODUCTION | 2016 |
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RU2653854C1 |
| COMPOSITION OF POLYETHYLENE FOR PRESSURE CASTING | 2015 |
|
RU2694048C2 |
| COMPOSITION OF POLYETHYLENE, HAVING HIGH DEGREE OF SWELLING | 2017 |
|
RU2720803C1 |
| POLYETHYLENE COMPOSITION FOR BLOW MOLDING HAVING HIGH SWELL RATIO AND IMPACT RESISTANCE | 2017 |
|
RU2720236C1 |
