High stiffness high impact propylene impact copolymers field of the invention
作者： Chai-Jing Chou
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摘要: The present invention relates to polypropylene impact copolymer compositions which exhibit improved stiffness without degrading the resistance performance. comprises a matrix and dispersed phase. homopolymer or propylene/alpha-olefin random more than 50 wt. % of units derived from propylene monomer. should have relatively high crystallinity, preferably 50% greater. has MWD between 4 8, such as typically obtained using Ziegler-Natta catalysts. phase in an ethylene-propylene 45 70 ethylene Preferably 20 percent by weight copolymer.
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