发明名称 |
A PRESSURELESS POLYMER PIPE, A COMPOSITION THEREFORE, AND A PROCESS FOR PREPARING IT |
摘要 |
<p>A pressureless polymer pipe, a composition therefore, and a process of preparing the composition are described. The pipe is characterised in that the polymer comprises a propylene polymer composition where the propylene base polymer is a heterophasic propylene copolymer having a matrix of a propylene homopolymer and a dispersed phase of an elastomeric copolymer of propylene and at least one olefin comonomer; has a comonomer content of 2-7 % by weight, based on the weight of the heterophasic propylene copolymer; has a melt flow rate MFR (2/230), determined according to ISO 1133 C4, of 0.1-2.0 g/10 min; has a broad molecular weight distribution as defined by its rheology shear thinning index, SHI<SUB>0/50</SUB>, measured at 200<SUP>°</SUP>C of 9-30; has a tensile modulus, determined according to ISO 527-2/1B at 1 mm/min and 23<SUP>°</SUP>C of at least 1800 MPa; has an impact strength, determined according to ISO 179/1eA of at least 6 kJ/m<SUP>2</SUP> at 0°C and at least 2 kJ/m<SUP>2</SUP> at -20'C. The composition is a polymer composition as defined above. The process is characterised by polymerizing in the presence of a stereospecific Ziegler-Natta catalyst including an electron donor:(i) a propylene homopolymer matrix in at least one loop reactor at a temperature of at least 80<SUP>°</SUP>C and a pressure of 4600-10000 kPa; and (ii) an elastomeric copolymer of propylene and at least one olefin comonomer in at least one gas-phase reactor at a lower temperature than in stage (i); to obtain a base polymer of heterophasic propylene copolymer as defined above.</p> |
申请公布号 |
WO2006024496(A1) |
申请公布日期 |
2006.03.09 |
申请号 |
WO2005EP09341 |
申请日期 |
2005.08.30 |
申请人 |
BOREALIS TECHNOLOGY OY;EK, CARL-GUSTAF;MALM, BO;TUOMINEN, OLLI |
发明人 |
EK, CARL-GUSTAF;MALM, BO;TUOMINEN, OLLI |
分类号 |
(IPC1-7):C08L23/12;C08F10/00;C08F110/06 |
主分类号 |
(IPC1-7):C08L23/12 |
代理机构 |
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代理人 |
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地址 |
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