Patent ID: 8563109
Filing Date: 2013-10-22
Classification: C08F,C08L,F16L,Y10T

Abstract:
1. A pressureless polymer pipe, wherein the polymer pipe comprises a propylene polymer composition comprising a propylene base polymer, wherein the propylene base polymer is a heterophasic propylene copolymer having a matrix of a multimodal propylene homopolymer, wherein the multimodal propylene homopolymer is produced in two or more reactors in series in the presence of different concentrations of hydrogen, 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 has a tensile modulus, determined according to ISO 527-2/1B at 1 mm/min and 23° C. of at least 1800 MPa; has an impact strength, determined according to ISO 179/1 eA of at least 6 kJ/m the propylene polymer composition comprises a nucleating agent; the heterophasic propylene copolymer has a content of xylene soluble material (XS) of 4-10% by weight, and the pipe has an E modulus, calculated from the ring stiffness, determined according to EN ISO 9969 for a pipe having a diameter of 110 mm and a wall thickness of 4 mm at 23° C., of at least 1800 MPa, said calculation being made according to formula (I): where E is the elasticity modulus in MPa, D is the outer diameter of the pipe in mm, and t is the wall thickness of the pipe in mm.