POLYOLEFINES COMPOSITION OF BALANCED RIGIDITY TO IMPACT STRENGTH RATIO, MIXTURE OF OLEFINIC POLYMERS FOR OBTAINING SUCH COMPOSITION, METHOD OF OBTAINING SUCH MIXTURE AND BUMPERS MADE OF SUCH POLYOLEFINES COMPOSITION

摘要

Disclosed are polyolefin compositions having high balance of stiffness and impact strength, which comprise (percentage by weight): A) 30%-60% of a propylene homopolymer or copolymer; B) 14%-30% of a fraction comprising copolymers of propylene with ethylene; C) 10%-25% of a copolymer of ethylene with a C3-C8 alpha -olefin; D) 5%-45% of a mineral filler.