CPC C08L 23/0815 (2013.01) [B29C 41/003 (2013.01); B29C 41/04 (2013.01); B29K 2023/08 (2013.01); B29L 2031/3011 (2013.01); B29L 2031/44 (2013.01); B29L 2031/7172 (2013.01); C08L 2205/025 (2013.01); C08L 2207/062 (2013.01); C08L 2207/066 (2013.01); C08L 2314/02 (2013.01)] | 18 Claims |
1. A rotomolding polymer melt blend composition comprising:
a first polyethylene copolymer having a density, measured according to ASTM D792, of from about 0.935 g/cm3 to about 0.940 g/cm3, a melt flow index, measured according to ASTM D1238 at 190° C./2.16 kg, of from about 3 g/10 min to about 8 g/10 min, and a molecular weight distribution Mw/Mn greater than 4, wherein the first polyethylene copolymer is present at a concentration of from about 70% by weight to about 95% by weight of the polymer melt blend composition; and
a second polyethylene copolymer having a density, measured according to ASTM D792, of from about 0.924 g/cm3 to about 0.934 g/cm3, a melt flow index, measured according to ASTM D1238 at 190° C./2.16 kg, of at least about 17 g/10 min, and a molecular weight distribution Mw/Mn greater than 3.5, wherein the second polyethylene copolymer is present at a concentration of from about 5% by weight to about 30% by weight of the polymer melt blend composition,
wherein the polymer melt blend composition has a density, measured according to ASTM D792, of from about 0.934 g/cm3 to 0.948 g/cm3, a melt flow index, measured according to ASTM D1238 at 190° C./2.16kg, of at least about 6.0 g/10 min, and an ARM impact of at least 55 J measured according to Low Temperature Impact Test Standard from the Association of Rotational Molders International version 4.0 (2003) on a 3.17 mm thickness sample at −40° C.
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