| 摘要 |
A polyolefin blend comprising, in physical admixture, a major portion of particles of a first polyethylene and a minor portion of particles of a composition of a second polyethylene, is disclosed. The first polyethylene is selected from the group consisting of homopolymers of ethylene and copolymers of ethylene and at least one C4-C10 higher alpha-olefin, and the second polyethylene is a copolymer of ethylene and at least one C4-C10 higher alpha-olefin having a density of at least 0.890 g/cm3, especially at least 0.910 g/cm3, and a melt index of at least 40 dg/min. The density of the second polyethylene is at least about 0.005 g/cm3 lower than that of the first polyethylene and the melt index of the second polyethylene is at least 10 dg/min. higher than that of the first polyethylene. The composition of the second polyethylene contains an agent that is capable of reacting with polyolefins that are in a molten state. Such agents are selected from the group consisting of cross-linking agents and modifying agents, and mixtures thereof. In an alternative embodiment, the second polyethylene has a shear viscosity that is not more than 30% of that of the first polyethylene at 200 DEG C. and a shear rate of 400 sec-1; in this regard, the first and second polyethylene may be more broadly defined as being homopolymers and copolymers of hydrocarbon alpha-olefins having 2-10 carbon atoms. The blends may be used in a wide variety of processes, including blow-moulding processes, film and pipe extrusion processes, sheet thermoforming processes and rotational moulding processes.
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