发明名称 |
HIGH DENSITY POLYMER COMPOSITIONS, A METHOD FOR THEIR PREPARATION AND PRESSURE-RESISTANT PIPES MADE THEREFROM |
摘要 |
<p>The present invention deals with polymer compositions suitable for making pipes. The compositions comprise a multimodal copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms wherein the multimodal ethylene copolymer has a density of from 937 to 950 kg/m3, a melt index MFR5 of from 0.3 to 3.0 g/10 min, a melt index MFR2 of from 0.1 to 2.0 g/10 min and a shear thinning index SHI2.7/210 of from 2 to 30. In addition the multimodal copolymer comprises: (A) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a low molecular weight ethylene polymer selected from ethylene homopolymer and a copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 5000 to 100000 g/mol and a density of from 960 to 977 kg/m3; and (B) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a high molecular weight copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 100000 to 1000000 g/mol and a density of from 890 to 929 kg/m3.</p> |
申请公布号 |
CA2719744(A1) |
申请公布日期 |
2009.12.10 |
申请号 |
CA20092719744 |
申请日期 |
2009.05.25 |
申请人 |
BOREALIS AG |
发明人 |
BAECKMAN, MATS;EK, CARL-GUSTAF;PAKKANEN, ANNELI;PALMLOEF, MAGNUS;TURPEINEN, TARJA-TUULIKKI;SEVERN, JOHN |
分类号 |
C08L23/08 |
主分类号 |
C08L23/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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