POLYPROPYLENE RESIN COMPOSITION WITH HIGH ELASTICITY

摘要

PURPOSE: A polypropylene resin composition is provided, which exhibits high elasticity and melt strength and an excellent vacuum formability. CONSTITUTION: The polypropylene resin composition comprises 89.95-98.5 wt% of a long chain-introduced polypropylene polymer; 1-10 wt% of acrylic polytetrafluoroethylene; and 0.05-0.5 wt% of an antioxidizing agent. Preferably the long chain-introduced polypropylene polymer is prepared by polymerization or copolymerization of monomers in the presence of a catalyst system, wherein the catalyst system comprises a prepolymerization catalyst obtained by treating the surface of an olefin polymerization solid titanium compound comprising a magnesium compound, a titanium compound and an electron donor with a silane compound having at least two double bonds, and prepolymerizing an olefin monomer and a diene compound with the surface-treated titanium catalyst; an organometallic compound of metals of group I or III; and an external electron donor.