SOFT POLYPROPYLENE COMPOSITIONS

A polypropylene composition comprising (per cent by weight unless otherwise specified): A) 65 to 95% by weight of a heterophasic polypropylene composition (I) having a MFR ranging from 0.2 to 1.2 g/10', comprising -(a) from 25 to 45% by weight of a polymer fraction comprising a propylene homopolymer, or a copolymer of propylene with one or more comonomers selected from ethylene and a CH2=CHR alpha-olefin, where R is a C2-C8 alkyl radical, or mixtures thereof; said copolymers containing at least 85% by weight of units derived from propylene, said fraction being insoluble in xylene at 25 °C for at least 90% by weight, and preferably MFR (230°C/2.16Kg) of from 2 to 70, more preferably of from 15 to 40 g/10min.; and -(b) from 55 to 75% by weight of a polymer fraction comprising a copolymer of ethylene with comonomers selected from propylene and CH2=CHR alpha-olefins, where R is a C2-C8 alkyl radical, and optionally with minor quantities of a diene, or mixtures thereof; said copolymers containing units derived from ethylene in a quantity lower than 40% by weight, said fraction having solubility in xylene at room temperature (25 °C) greater than 60% by weight, (wherein the total of (a) and (b) fractions is 100%), and (B) from 5 to 35%, more preferably from 8 to 25% of recycled styrene block copolymer (SBC) having a melt flow rate (190°C/2.16 Kg) from 0.5 to 15 g/10 min, the whole polypropylene composition having a value of melt flow rate (ISO 1133 230°C/2.16 kg) ranging from 0.4 g/10min to 1.4 g/10min, more preferably from 0.6 to 1.0 g/10min; the percentages of A and B being referred to the sum of A and B. L'invention concerne une composition de polypropylène comprenant (en pourcentage en poids, sauf indication contraire) : A) de 65 à 95 % en poids d'une composition de polypropylène hétérophasique (I) ayant une valeur d'IFC allant de 0,2 à 1,2 g/10', comprenant - (a) de 25 à 45 % en poids d'une fraction polymère comprenant un homopolymère de propylène, ou un copolymère de propylène avec un ou plusieurs comonomères choisis parmi l'éthylène et une alpha-oléfine du type CH2=CHR, R représentant un radical alkyle en C2-C8, ou des mélanges correspondants ; lesdits copolymères contenant au moins 85 % en poids de motifs dérivés du propylène, ladite fraction étant insoluble dans le xylène à 25 °C pour au moins 90 % en poids, et présentant de préférence une valeur d'IFC (230 °C/2,16 kg) allant de 2 à 70, plus préférentiellement de 15 à 40 g/10 min ; et - (b) de 55 à 75 %