POLYOLEFIN MASTERBATCH AND COMPOSITION SUITABLE FOR INJECTION MOLDING

摘要

A masterbatch composition comprising (percent by weight): A) 50%-90% of a crystalline polypropylene component comprising: A ) from 25% to 75% of a fraction having a melt flow rate MFR of from 0.1 to 10 g/10 min.; and A<II>) from 75% to 25% of a fraction having a melt flow rate value MFR<II> equal to or lower than 100 g/10 min.; wherein the ratio MFR /MFR<II> is from 5 to 60; and B) 10%-50% of a copolymer component of ethylene and at least one C3-C10 alpha-olefin, containing from 15% to 50% of ethylene; said masterbatch composition having a value of the intrinsic viscosity [eta] of the fraction soluble in xylene at room temperature equal to or higher than 3.5 dl/g, is added to polyolefin materials to obtain final compositions suitable for injection molding.