Long-chain, branched, propylene-based polymers, of which the melt index and
the molecular weight distribution and the melt tension and the limiting
viscosity both satisfy specific requirements, have good physical
properties that are comparable to or better than those of conventional
propylene-based polymers. They have good melt workability and are
favorable to large-size blow molding and extrusion foaming. They are
favorably used as miscibility improvers for propylene homopolymers and
propylene-based copolymers.
