FIELD: chemistry.
SUBSTANCE: invention relates to ethylene/alpha-olefin copolymers. Polymer comprises ethylene and at least one alpha-olefin having 4 to 20 carbon atoms. Polymer has a melt index ratio (MIR) greater than about 40. Polymer also has a Mw1/Mw2 value of at least about 2.0, where Mw1/Mw2 is the ratio of the weight average molecular weight (Mw) for the first half of a temperature rising elution (TREF) curve from a cross-fractionation (CFC) analysis to an Mw for a second half of the TREF curve. Polymer also has a Tw1-Tw2 value of less than about -15 °C, where Tw1-Tw2 is the difference of a weight average elution temperature (Tw) for the first half of the TREF curve to a Tw for the second half of the TREF curve.
EFFECT: obtaining a polymer with improved physical properties.
10 cl, 8 dwg, 10 tbl, 10 ex
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