Pressureless Polymer Pipe, A Compositon Therefore,

专利名称：Pressureless Polymer Pipe, A Compositon

Therefore, And A Process For Preparing It

发明人：Carl-Gustaf Ek,Bo Malm,Olli Tuominen申请号：US11661574申请日：20050830

公开号：US20110123745A1公开日：20110526

摘要：A pressureless polymer pipe, a composition therefore, and a process ofpreparing the composition are described. The pipe is characterised in that the polymercomprises a propylene polymer composition where the propylene base polymer is aheterophasic propylene copolymer having a matrix of a propylene homopolymer and adispersed phase of an elastomeric copolymer of propylene and at least one olefincomonomer; has a comonomer content of 2-7% by weight, based on the weight of theheterophasic propylene copolymer; has a melt flow rate MFR (2/230), determinedaccording to ISO 1133 C4, of 0.1-2.0 g/10 min; has a broad molecular weight distributionas defined by its rheology shear thinning index, SHI, measured at 200° C. of 9-30; has atensile modulus, determined according to ISO 527-2/1B at 1 mm/min and 23° C. of at least1800 MPa; has an impact strength, determined according to ISO 179/1 eA of at least 6kJ/mat 0° C. and at least 2 kJ/mat −20° C. The composition is a polymer composition asdefined above. The process is characterised by polymerizing in the presence of astereospecific 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° C. and apressure 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 instage (i); to obtain a base polymer of heterophasic propylene copolymer as definedabove.

申请人：Carl-Gustaf Ek,Bo Malm,Olli Tuominen

地址：Vastra Frolunda SE,Espoo FI,Helsinki FI

国籍：SE,FI,FI

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