FIELD: chemistry.
SUBSTANCE: composition contains basic polyethylene resin making up at least 90 wt % of all the composition and having time to failure equal to at least 250 hours measured according to ISO 1167 at 95°C and 4.3 MPa. The basic resin contains a copolymer of ethylene with alpha-olefin, containing 4-20 carbon atoms, as fraction (A) and a homopolymer of ethylene or copolymer of ethylene with alpha-olefin, containing 4-20 carbon atoms, as fraction (B). Fraction (A) has lower molecular weight than fraction (B). Density of the basic resin is lower than 940 kg/cm3, and melt flow rate (MFR5) at 190°C/5.00 kg is equal to at least 0.20 g/10 min.
EFFECT: higher pressure resistance at high temperature, as well as improved flexibility of the tube.
12 cl, 1 tbl, 2 ex
| Title | Year | Author | Number |
|---|---|---|---|
| MULTIMODAL POLYETHYLENE RESIN FOR TUBES, OBTAINED USING SINGLE-SITE CATALYST ON METAL | 2007 |
|
RU2425070C2 |
| POLYETHYLENE COMPOSITION FOR MAKING PRESSURE PIPES WITH IMPROVED FLEXIBILITY | 2007 |
|
RU2412220C2 |
| POLYETHYLENE COMPOSITION FOR MAKING HIGHLY FLEXIBLE PRESSURE PIPES | 2007 |
|
RU2408619C2 |
| PIPE CONTAINING POLYETHYLENE OF INCREASED RESISTANCE TO SLOW GROWTH OF CRACKS | 2008 |
|
RU2430288C2 |
| MULTIMODAL POLYMER COMPOSITION FOR TUBES AND TUBES MANUFACTURING THEREFROM | 1999 |
|
RU2223987C2 |
| POLYETHYLENE RESIN FOR PIPES WITH HIGH RESISTANCE TO SLOW CRACK GROWTH | 2021 |
|
RU2820451C1 |
| PIPES MANUFACTURED FROM POLYETHYLENE COPOLYMER WITH SLOW CRACK GROWTH | 2011 |
|
RU2539594C2 |
| POLYETHYLENE RESIN FOR PIPE FITTING | 2005 |
|
RU2375392C2 |
| POLYETHYLENE COMPOSITION FOR PRESSURE PIPES WITH IMPROVED HOMOGENEITY | 2019 |
|
RU2777964C1 |
| NOVEL COMPOSITION AND METHOD | 2017 |
|
RU2736712C1 |
