POLYMER BLENDS
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United States of America Patent
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Issued Date -
Apr 30, 2015
app pub date -
Nov 30, 2012
filing date -
Dec 1, 2011
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Abstract
Novel polymer blends comprise (a) 90-97% by weight of a copolymer of ethylene and an alpha olefin having from 3 to 10 carbon atoms, said copolymer having (i) a density in the range of 0.910 to 0.940 g cm−3, (ii) a melt index (190° C./2.16 kg), MI2<5, and (iii) molecular weight distribution Mw-cc/Mn-cc, by classical GPC) in the range 2.0-5.0, and (b) from 3-10% by weight of a low density polyethylene polymer having (i) a density from 0.910 to 0.920 g cm″3, (ii) a melt index (190° C./2.16 kg), MI2>2, and (iii) a melt elastic modulus G′ (G″=500 Pa)>140 Pa at 190° C., wherein the sum of (a) and (b) is 100%. The copolymer component (a) may be prepared by use of metallocene catalyst systems and the novel blends exhibit an improved balance of processability and mechanical properties and are particularly useful for film applications.
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