FIELD: chemistry.
SUBSTANCE: polymer base is not less than 90 wt % of the overall composition and has density of 940-947 kg/m3.The fraction of homo- or copolymer of ethylene (A) has lower average molecular weight than the fraction of homo- or copolymer of ethylene. The polyethylene composition has melt flow rate MFR5 of 0.1-0.5 g/10 min and viscosity reduction index during shear (2.7/210) of 10-49, has better combination of properties, in particular high flexibility and high mechanical strength and good long-term stability.
EFFECT: pipes made from the disclosed polyethylene composition have good performance properties, especially in terms of flexibility and rapid propagation of cracks while preserving minimal required strength, processing characteristics, impact viscosity and resistance to slow propagation of cracks.
14 cl, 1 tbl, 3 ex
| Title | Year | Author | Number |
|---|---|---|---|
| POLYETHYLENE COMPOSITION FOR MAKING PRESSURE PIPES WITH IMPROVED FLEXIBILITY | 2007 |
|
RU2412220C2 |
| PIPE CONTAINING POLYETHYLENE OF INCREASED RESISTANCE TO SLOW GROWTH OF CRACKS | 2008 |
|
RU2430288C2 |
| TUBE, HAVING HIGH HEAT RESISTANCE AND USE OF POLYETHYLENE COMPOSITION IN MAKING SAID TUBE | 2007 |
|
RU2426931C2 |
| MULTIMODAL POLYMER COMPOSITION FOR TUBES AND TUBES MANUFACTURING THEREFROM | 1999 |
|
RU2223987C2 |
| MULTIMODAL POLYETHYLENE RESIN FOR TUBES, OBTAINED USING SINGLE-SITE CATALYST ON METAL | 2007 |
|
RU2425070C2 |
| POLYETHYLENE RESIN FOR PIPES WITH HIGH RESISTANCE TO SLOW CRACK GROWTH | 2021 |
|
RU2820451C1 |
| PIPES MANUFACTURED FROM POLYETHYLENE COPOLYMER WITH SLOW CRACK GROWTH | 2011 |
|
RU2539594C2 |
| MULTIMODAL POLYMER | 2009 |
|
RU2491298C2 |
| MULTIMODAL POLYMER | 2009 |
|
RU2496794C2 |
| POLYETHYLENE COMPOSITION FOR PRESSURE PIPES WITH IMPROVED HOMOGENEITY | 2019 |
|
RU2777964C1 |
