04-04-2013 дата публикации
Номер: US20130085231A1
Polymer blends and films made therefrom are provided. The polymer blend can include a first polyethylene having a density of less than about 0.940 g/cm, a melt index (I) greater than 0.75 g/10 min, and a melt index ratio (I/I) of less than 30. The polymer blend can also include a second polyethylene having a density of less than about 0.940 g/cm, a melt index (I) of less than 1 g/10 min, a melt index ratio (I/I) greater than 30, and a molecular weight distribution (Mw/Mn) of less than 4.5. 1. A polymer blend , comprising:{'sup': '3', 'sub': 2', '21', '2, 'a first polyethylene having a density of less than about 0.940 g/cm, a melt index (I) greater than 0.75 g/10 min, and a melt index ratio (I/I) of less than 30; and'}{'sub': 2', '21', '2', 'W', '2', '21, 'a second polyethylene having a density of less than about 0.940 g/cm, a melt index (I) of less than 1 g/10 min, a melt index ratio (I/I) greater than 30, and a molecular weight distribution (Mw/Mn) of less than 4.5, Mand Mn being determined using gel permeation chromatography, density being determined in accordance with ASTM D-792, Ibeing determined using ASTM D-1238E (at 190° C., using a 2.16 kg weight) and Ibeing determined using ASTM D-1238F (at 190° C., using a 21.6 kg weight).'}2. The polymer blend of claim 1 , wherein the melt index (I) of the second polyethylene ranges from about 0.01 g/10 min to about 0.8 g/10 min.3. The polymer blend of claim 1 , wherein the melt index (I) of the second polyethylene ranges from about 0.01 g/10 min to about 0.6 g/10 min.4. The polymer blend of claim 1 , wherein the melt index (I) of the first polyethylene is greater than 1 g/10 min and less than 20 g/10 min.5. The polymer blend of claim 1 , wherein the melt index ratio (I/I) of the second polyethylene ranges from about 33 to about 150 and the molecular weight distribution (Mw/Mn) of the second polyethylene ranges from about 3 to about 4.2.6. The polymer blend of claim 1 , wherein the melt index ratio (I/I) of the second ...
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