FIELD: chemistry.
SUBSTANCE: invention relates to a multimodal polyethylene composition. Composition of multimodal polyethylene contains (A) 51–58 pts.wt of low-molecular polyethylene or medium-molecular polyethylene obtained by polymerisation in a first reactor, (B) 12–21 pts.wt. of first high-molecular weight polyethylene or first ultrahigh molecular weight polyethylene obtained by polymerisation in a second reactor, and (C) 27–33 pts.wt. of a second high-molecular weight polyethylene or a second ultra-high molecular weight polyethylene copolymer obtained by polymerisation in a third reactor. Polyethylene obtained in each reactor has a different molecular weight. Ratio Mw/Mn between the weight-average molecular weight Mw of the multimodal polyethylene composition and the number-average molecular weight Mn of the multimodal polyethylene composition is in range of 10–23.
EFFECT: multimodal polyethylene composition is characterized by high resistance to Charpy impact loads, improved resistance to slow growth of cracks and resistance to rapid propagation of cracks.
11 cl, 4 tbl, 6 ex
| Title | Year | Author | Number |
|---|---|---|---|
| MULTIMODAL POLYETHYLENE PIPE | 2017 |
|
RU2794125C2 |
| PIPE OF MULTIMODAL POLYETHYLENE | 2017 |
|
RU2761951C2 |
| HIGH-TECHNOLOGICAL MULTIMODAL ULTRAHIGH MOLECULAR WEIGHT POLYETHYLENE | 2017 |
|
RU2728873C1 |
| HIGH-TECHNOLOGICAL MULTIMODAL ULTRAHIGH MOLECULAR WEIGHT POLYETHYLENE | 2017 |
|
RU2740662C2 |
| SCREW-ON CAP MADE OF MULTIMODAL POLYETHYLENE | 2017 |
|
RU2758691C2 |
| CONTAINER MADE OF MULTIMODAL POLYETHYLENE | 2017 |
|
RU2759667C2 |
| MIXTURES OF POLYOLEFIN RESINS FOR HIGH RESISTANCE TO CRACKING UNDER STRESS AND GOOD RECYCLABILITY | 2019 |
|
RU2784520C2 |
| REACTOR SYSTEM FOR POLYMERIZATION OF POLYMODAL POLYETHYLENE | 2017 |
|
RU2757917C2 |
| MULTIMODAL POLYETHYLENE FILM | 2017 |
|
RU2757914C2 |
| MULTIMODAL POLYETHYLENE COMPOSITION AND FILM INCLUDING IT | 2017 |
|
RU2759997C2 |
