Ethylene/1-butene copolymers with enhanced resin processability
First Claim
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1. An ethylene copolymer made by polymerizing ethylene and 1-butene with a single site catalyst system in a polymerization reactor, the ethylene copolymer having a density of from 0.912 to 0.94 g/cm3, a melt index (I2) of from 0.5 to 10 g/10 min, a melt flow ratio (I21/I2) of from 20 to 35, a molecular weight distribution (Mw/Mn) of from 2.0 to 4.5, a shear thinning index of 0.75 or less, and an accelerated haul-off melt, strength (σ
-
MS) as determined by Rosand capillary rheometry at 190°
C., of at least 3.0 cN.
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Abstract
Ethylene/1-butene copolymers made with a single site catalyst system have high melt strength and good processability.
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Citations
13 Claims
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1. An ethylene copolymer made by polymerizing ethylene and 1-butene with a single site catalyst system in a polymerization reactor, the ethylene copolymer having a density of from 0.912 to 0.94 g/cm3, a melt index (I2) of from 0.5 to 10 g/10 min, a melt flow ratio (I21/I2) of from 20 to 35, a molecular weight distribution (Mw/Mn) of from 2.0 to 4.5, a shear thinning index of 0.75 or less, and an accelerated haul-off melt, strength (σ
-
MS) as determined by Rosand capillary rheometry at 190°
C., of at least 3.0 cN. - View Dependent Claims (2, 3, 4, 5)
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MS) as determined by Rosand capillary rheometry at 190°
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6. A film structure comprising a film layer made from an ethylene/1-butene copolymer wherein the ethylene/1-butene copolymer is made by polymerizing ethylene and 1-butene with a single site catalyst system in a polymerization reactor, the ethylene/1-butene copolymer having density of from 0.912 to 0.94 g/cm3, a melt index (I2) of from 0.5 to 10 g/10 min, a melt flow ratio (I21/I2) of from 20 to 35, a molecular weight distribution (Mw/Mn) of from 2.0 to 4.5, a shear thinning index of 0.75 or less, and an accelerated haul-off melt strength (σ
-
MS) as determined by Rosand capillary rheometry at 190°
C., of at least 3.0 cN.
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MS) as determined by Rosand capillary rheometry at 190°
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7. An ethylene copolymer made by polymerizing ethylene and 1-butene with a single site catalyst system in a polymerization reactor, the ethylene copolymer having density of from 0.912 to 0.94 g/cm3, a melt index (I2) of from 0.5 to 10 g/10 min, a melt flow ratio (I21/I2) of from 20 to 35, a molecular weight distribution (Mw/Mn) of from 2.0 to 4.5, and which satisfies the following relationship:
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(CDBI50/δ
XO)3.0≦
6.5−
5.7 log [a(1.5(I21/I2)+(Mw/Mn))];where CDBI50 is the composition distribution breadth index, δ
XO is the crossover phase angle at a frequency of 1.0 rad/s and a is the CY a parameter.- View Dependent Claims (8)
where σ
MS is the accelerated haul-off melt strength determined at 190°
C.; and
G*XO is the crossover complex modulus at a frequency of 1.0 rad/s.
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9. A film structure comprising a film layer made from an ethylene/1-butene copolymer wherein the ethylene/1-butene copolymer is made by polymerizing ethylene and 1-butene with a single site catalyst system in a polymerization reactor, the ethylene/1-butene copolymer having density of from 0.912 to 0.94 g/cm3, a melt index (I2) of from 0.5 to 10 g/10 min, a melt flow ratio (I21/I2) of from 20 to 35, a molecular weight distribution (Mw/Mn) of from 2.0 to 4.5, and which satisfies the following relationship:
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(CDBI50/δ
XO)3.0≦
6.5−
5.7 log [a(1.5(I21/I2)+(Mw/Mn))];where CDBI50 is the composition distribution breadth index, δ
XO is the crossover phase angle at a frequency of 1.0 rad/s and a is the CY a parameter.
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10. An ethylene copolymer made by polymerizing ethylene and 1-butene with a single site catalyst system in a polymerization reactor, the ethylene copolymer having a density of from 0.912 to 0.94 g/cm3, a melt index (I2) of from 0.5 to 10 g/10 min, a melt flow ratio (I21/I2) of from 20 to 35, a molecular weight distribution (Mw/Mn) of from 2.0 to 4.5, a shear thinning index of 0.75 or less, a CY a parameter of 0.40 or less, an accelerated haul-off melt strength (σ
-
MS) as determined by Rosand capillary rheometry at 190°
C., of at least 3.0 cN and which satisfies the following relationship;
(CDBI50/δ
XO)3.0≦
6.5−
5.7 log [a(1.5(I21/I2)+(Mw/Mn))];where CDBI50 is the composition distribution breadth index, δ
XO is the crossover phase angle at a frequency of 1.0 rad/s and a is the CY a parameter.- View Dependent Claims (11)
where σ
MS is the accelerated haul-off melt strength determined at 190°
C.; and
G*XO is the crossover complex modulus at a frequency of 1.0 rad/s.
-
MS) as determined by Rosand capillary rheometry at 190°
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12. A film structure comprising a film layer made from an ethylene/1-butene copolymer wherein the ethylene/1-butene copolymer is made by polymerizing ethylene and 1-butene with a single site catalyst system in a polymerization reactor, the ethylene copolymer having a density of from 0.912 to 0.94 g/cm3, a melt index (I2) of from 0.5 to 10 g/10 min, a melt flow ratio (I21/I2) of from 20 to 35, a molecular weight distribution (Mw/Mn) of from 2.0 to 4.5, a shear thinning index of 0.75 or less, a CY a parameter of 0.40 or less, an accelerated haul-off melt strength (σ
-
MS) as determined by Rosand capillary rheometry at 190°
C., of at least 3.0 cN and which satisfies the following relationship;
(CDBI50/δ
XO)3.0≦
6.5−
5.7 log [a(1.5(I21/I2)+(Mw/Mn))];where CDBI50 is the composition distribution breadth index, δ
XO is the crossover phase angle at a frequency of 1.0 rad/s and a is the CY a parameter.- View Dependent Claims (13)
where σ
MS is the accelerated haul-off melt strength determined at 190°
C.; and
G*XO is the crossover complex modulus at a frequency of 1.0 rad/s.
-
MS) as determined by Rosand capillary rheometry at 190°
Specification