Patent ID: 8304487

Claim:
A concentrate comprising (percentages by weight): A) from 40% to 95% of a composition relative to the total weight of A) comprising: 1) from 25% to 35% of polybutene-1 having a melting point of crystalline form 2 from 81 to 109° C. selected from homopolymers of butene-1 or copolymers of butene-1 with up to 30 mol % of olefinic comonomers selected from ethylene and alpha-olefins containing from 5 to 8 carbon atoms, wherein the polybutene-1 comprises a melt flow rate ranging from 100 to 1000 g/10 min., measured at 190° C. at 2.16 kg; 2) from 75% to 65% of polypropylene selected from isotactic crystalline homopolymers of propylene or copolymers of propylene with at least one of ethylene and CH 2 ═CHR alpha-olefins in which R is an alkyl radical with 2-8 carbon atoms, containing more than 85 wt % propylene; and B) from 5% to 60% of one or more additives.