Abstract: Heterophasic polypropylene copolymers having an MFR (2.16 kg, 230° C.) of 15 to 200 g/10 min, determined according to ISO 1133 comprising a propylene homo- or copolymer matrix with an MFR (2.16 kg, 230° C.) of 80 to 500 g/10 min, determined according to ISO 1133 (A) and an ethylene or C4-C10-alpha-olefin propylene rubber phase (B) dispersed within the matrix, wherein the heterophasic polypropylene resin has a fraction soluble in p-xylene at 25° C. (XCS), having an intrinsic viscosity of 2.85 to 4.00 dl/g, determined according to DIN EN ISO 1628-1 and -3 and being composed of propylene monomer units in an amount of 70 wt % to 90 wt %, with optimum balance of impact resistance and low amount of hexane extractables; a process for their preparation and their use.

Abstract: Heterophasic polypropylene copolymers having an MFR (2.16 kg, 230° C.) of 15 to 200 g/10 min, determined according to ISO 1133 comprising a propylene homo- or copolymer matrix with an MFR (2.16 kg, 230° C.) of 80 to 500 g/10 min, determined according to ISO 1133 (A) and an ethylene or C4-C10-alpha-olefin propylene rubber phase (B) dispersed within the matrix, wherein the heterophasic polypropylene resin has a fraction soluble in p-xylene at 25° C. (XCS), having an intrinsic viscosity of 2.85 to 4.00 dl/g, determined according to DIN EN ISO 1628-1 and -3 and being composed of propylene monomer units in an amount of 70 wt % to 90 wt %, with optimum balance of impact resistance and low amount of hexane extractables; a process for their preparation and their use.

Abstract: The description refers to a pipe, especially a pressure pipe, with a pipe body extruded from polypropylene. To achieve a high resistance to a rapid crack formation, it is suggested that the pipe body consists of a polypropylene in a predominantly hexagonally crystallised &bgr;-form with a nucleation agent based on an amide.