C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/4015, 400/65
C08L 23/02 (2006.01) C08J 3/22 (2006.01)
Patent
CA 1262979
ABSTRACT OF THE DISCLOSURE 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 50% of that of the first polyethylene at 200°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.
485659
Du Pont Canada Inc.
Sim & Mcburney
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