Linear polymers, polymer blends, and articles made therefrom
First Claim
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1. A polymer composition comprising a blend of:
- a. from about 5 to about 95 wt % of a first polymer selected from the group consisting of high density polyethylene, linear low density polyethylene, low density polyethylene, medium density polyethylene, very low density polyethylene, differentiated polyethylene, and combinations thereof; and
b. from about 95 to about 5 wt % of a second polymer comprising an ethylene-based polymer produced by gas-phase polymerization of ethylene with a catalyst having as a transition metal component a bis(n-C3-4 alkyl cyclopentadienyl) hafnium compound, wherein said transition metal component comprises from about 95 mole % to about 99 mole % of said hafnium compound and wherein said ethylene-based polymer has;
i. a melt index of from about 0.1 g/10 min to about 300 g/10 min;
ii. a melt index ratio of from about 15 to about 45;
iii. a weight average molecular weight (Mw) of from about 20,000 to about 200,000;
iv. a molecular weight distribution (Mw/Mn) of from about 2.0 to about 4.5;
v. a Mz/Mw ratio of from about 1.7 to about 3.5; and
vi. a CDBI of from 20% to 35%; and
wherein said first polymer is different from said second polymer and wherein the composition has a Dart A Impact Strength of 850 to about 1100 g/mil and an average modulus of the MD and TD 1% Secant Moduli >
35.0 kpsi.
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Abstract
Provided are blends of linear low density polyethylene copolymers with very low density, low density, medium density, high density, and differentiated polyethylenes and other polymers. The invention also includes articles produced from the linear low density polyethylene and polyethylene blends described herein.
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Citations
39 Claims
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1. A polymer composition comprising a blend of:
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a. from about 5 to about 95 wt % of a first polymer selected from the group consisting of high density polyethylene, linear low density polyethylene, low density polyethylene, medium density polyethylene, very low density polyethylene, differentiated polyethylene, and combinations thereof; and b. from about 95 to about 5 wt % of a second polymer comprising an ethylene-based polymer produced by gas-phase polymerization of ethylene with a catalyst having as a transition metal component a bis(n-C3-4 alkyl cyclopentadienyl) hafnium compound, wherein said transition metal component comprises from about 95 mole % to about 99 mole % of said hafnium compound and wherein said ethylene-based polymer has; i. a melt index of from about 0.1 g/10 min to about 300 g/10 min; ii. a melt index ratio of from about 15 to about 45; iii. a weight average molecular weight (Mw) of from about 20,000 to about 200,000; iv. a molecular weight distribution (Mw/Mn) of from about 2.0 to about 4.5; v. a Mz/Mw ratio of from about 1.7 to about 3.5; and vi. a CDBI of from 20% to 35%; and wherein said first polymer is different from said second polymer and wherein the composition has a Dart A Impact Strength of 850 to about 1100 g/mil and an average modulus of the MD and TD 1% Secant Moduli >
35.0 kpsi. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 38)
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36. A film comprising a blend of:
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a. from about 5 to about 95 wt % of a first polymer selected from the group consisting of high density polyethylene, linear low density polyethylene, low density polyethylene, medium density polyethylene, very low density polyethylene, differentiated polyethylene, and combinations thereof; and b. from about 95 to about 5 wt % of a second polymer comprising at least one ethylene-based polymer produced by gas-phase polymerization of ethylene with a catalyst having as a transition metal component a bis(n-C3-4 alkyl cyclopentadienyl) hafnium compound, wherein said transition metal component comprises from about 95 mole % to about 99 mole % of said hafnium compound and wherein said ethylene-based polymer has; a melt index ratio of from about 20 to about 40, a molecular weight distribution (Mw/Mn) of from about 3.0 to about 4.0, a ratio of z-average molecular weight to weight average molecular weight of from about 2.2 to about 3.0, and a CDBI of from 20% to 35%, wherein the film has a Dart A Impact Strength of 850 to about 1100 g/mil and an average modulus of the MD and TD 1% Secant Moduli >
35.0 kpsi. - View Dependent Claims (37, 39)
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Specification