Polyethylene compositions and films having improved strength and optical properties
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United States of America Patent
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Jun 26, 2012
Grant Date -
Mar 1, 2012
app pub date -
Aug 24, 2010
filing date -
Aug 24, 2010
priority date (Note) -
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Abstract
A polyethylene composition comprising 0.01% to 1% by weight of at least one platelet-shaped nano boehmite nucleator, wherein the platelet-shaped nano boehmite nucleator comprises at least 70% by weight of Al2O3 and has a crystallite size of at least 5 nm, and the polyethylene composition comprises a density greater than 0.94 g/cm3, a melt index (MI2) ranging from equal to or greater than 0.3 g/10 min. up to equal to or less than 3 g/10 min., and a peak crystallization temperature (Tc) value determined according to ASTM D 3418, with an annealing temperature of 160° C. and a cooling rate of 10° C./min., that corresponds to formula (I):
where A is 200 cm3-° C./g, Tc is in units of ° C., and density is in units of g/cm3.
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