Ethylene copolymers having a narrow distribution of comonomers
AssigneeBASF SE
InventorsMarc Oliver Kristen, Dieter Lilge
Life of this patent
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Abstract
An ethylene copolymer, composed of units of ethylene and at least one C3-C12 α-olefin, having a molecular weight distribution Mw/Mn exceeding 3 and a distribution of comonomers which is characterized by a standard deviation σ of the average-weighted elution temperature Ta, determined by the method of the Temperature Rising Elution Fraction (TREF), which conforms to the following equation GI: σ < k 4 - k 1 ( T a - k o ) - k 2 k 3 ( T a - k o ) / ( 1 + k 3 ( T a - k o ) ) [ ° C . ] GI where k0 is 338.5° C., k1 is 0.053, k2 is 1.1318° C., k3 is 0.00483° C.−1, k4 is 0.55° C., and Ta is <98° C.
Claims12
An ethylene copolymer, composed of units of ethylene and at least one C3-C12 α-olefin, having a heptane-extractable content of less than 0.1 wt %, based on the total weight of the copolymer, a molecular weight distribution Mw/Mn exceeding 3 and a distribution of comonomers which is characterized by a standard deviation σ of the average-weighted elution temperature Ta, determined by the method of the Temperature Rising Elution Fraction (TREF), which conforms to the following equation GI:
- σ < k 4 - k 1 ( T a - k o ) - k 2 k 3 ( T a - k o ) / ( 1 + k 3 ( T a - k o ) ) ( ° C . ) GI
- where k0 is 338.5° C., k1 is 0.053, k2 is 1.1318° C., k3 is 0.00483° C.−1, k4 is 0.55° C., and Ta is <98° C.
Dependencies are inferred from the claim text.