Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1986-06-11
1988-04-12
Seccuro, Carman J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525194, 525240, 525199, C08L 2326, C08L 5106
Patent
active
047375477
ABSTRACT:
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 C.sub.4 -C.sub.10 higher alpha-olefin, and the second polyethylene is a copolymer of ethylene and at least one C.sub.4 -C.sub.10 higher alpha-olefin having a density of at least 0.890 g/cm.sup.3, especially at least 0.910 g/cm.sup.3, and a melt index of at least 40 dg/min. The density of the second polyethylene is at least about 0.005 g/cm.sup.3 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.degree. C. and a shear rate of 400 sec.sup.-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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Du Pont Canada Inc.
Seccuro Carman J.
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