FIELD: chemistry.
SUBSTANCE: invention relates to composition of polymodal polyethylene, which has improved resistance to cracking under impact of environment and higher rate of crystallisation. Composition contains ethylene homopolymer, two ethylene copolymers and nucleating agent in amount from 20 to 5000 ppm in terms of entire polyethylene composition. Second ethylene copolymer has higher molecular weight than first ethylene copolymer, and first ethylene copolymer has higher molecular weight than ethylene homopolymer.
EFFECT: obtained polyethylene composition possesses resistance to cracking under impact of environment (ASTM D1693, Conditions B, in 100% Igepal) more than or equal 40 days, and half time of crystallisation lower than or equal 70% of half time of crystallisation of polymodal polyethylene without nucleating agent.
12 cl, 1 tbl, 12 ex
| Title | Year | Author | Number |
|---|---|---|---|
| POLYETHYLENE MOULDING COMPOSITION FOR PRESSURE CASTING FINISHED PARTS | 2006 |
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RU2411264C2 |
| POLYMER COMPOSITION FOR CONTAINER CAPPING MEANS | 2017 |
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| MIXTURES OF POLYOLEFIN RESINS FOR HIGH RESISTANCE TO CRACKING UNDER STRESS AND GOOD RECYCLABILITY | 2019 |
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| MOULDING COMPOSITION PREPARED FROM POLYETHYLENE WITH MULTIMODAL MOLECULAR WEIGHT DISTRIBUTION FOR MAKING PIPES WITH IMPROVED MECHANICAL PROPERTIES | 2006 |
|
RU2429253C2 |
| REACTOR SYSTEM FOR POLYMERIZATION OF POLYMODAL POLYETHYLENE | 2017 |
|
RU2757917C2 |
| POLYOLEFIN COMPOSITIONS, ARTICLES MADE THEREFROM AND PREPARATION METHODS THEREOF | 2007 |
|
RU2444546C2 |
| MULTIMODAL POLYETHYLENE PIPE | 2017 |
|
RU2794125C2 |
| BIMODAL POLYETHYLENE RESINS OF HIGH DENSITY AND COMPOSITION WITH IMPROVED PROPERTIES, AND WAYS OF THEIR PRODUCTION AND APPLICATION | 2012 |
|
RU2629120C2 |
| MULTIMODAL POLYETHYLENE MOULDING COMPOSITION FOR MAKING TUBES HAVING IMPROVED MECHANICAL PROPERTIES | 2007 |
|
RU2454443C2 |
| PIPE OF MULTIMODAL POLYETHYLENE | 2017 |
|
RU2761951C2 |
