Ethylene/1-butene copolymers with enhanced resin processability
First Claim
Patent Images
1. A process for making an ethylene/1-butene copolymer, the process comprising polymerizing ethylene and 1-butene with a single site catalyst system in a gas phase polymerization reactor, wherein the ethylene/1-butene copolymer has density of from 0.912 to 0.94 g/cm3, a melt index (12) of from 0.5 to 10 g/10 min, a melt flow ratio (121/12) of from 20 to 35, a molecular weight distribution (Mw/Mn) of from 2.0 to 4.5, and an accelerated haul-off melt strength (σ
-
MS) as determined by Rosand capillary rheometry at 190°
C., of at least 3.0 cN;
wherein the single site catalyst system comprises a phosphinimine catalyst, a cocatalyst and an inert support.
1 Assignment
0 Petitions
Accused Products
Abstract
Ethylene/1-butene copolymers made with a single site catalyst system have high melt strength and good processability.
-
Citations
8 Claims
-
1. A process for making an ethylene/1-butene copolymer, the process comprising polymerizing ethylene and 1-butene with a single site catalyst system in a gas phase polymerization reactor, wherein the ethylene/1-butene copolymer has density of from 0.912 to 0.94 g/cm3, a melt index (12) of from 0.5 to 10 g/10 min, a melt flow ratio (121/12) of from 20 to 35, a molecular weight distribution (Mw/Mn) of from 2.0 to 4.5, and an accelerated haul-off melt strength (σ
-
MS) as determined by Rosand capillary rheometry at 190°
C., of at least 3.0 cN;
wherein the single site catalyst system comprises a phosphinimine catalyst, a cocatalyst and an inert support. - View Dependent Claims (2)
-
MS) as determined by Rosand capillary rheometry at 190°
-
3. A process for making an ethylene/1-butene copolymer, the process comprising polymerizing ethylene and 1-butene with a single site catalyst system in a gas phase polymerization reactor, wherein the ethylene/1-butene copolymer has 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:
-
(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 (4, 5, 6, 7, 8)
wherein R¥
is a substituted or unsubstituted alkyl group, a substituted or an unsubstituted aryl group, or a substituted or unsubstituted benzyl group, wherein substituents for the alkyl, aryl or benzyl group are selected from alkyl, aryl, alkoxy, aryloxy, alkylaryl, arylalkyl and halide substituents; and
wherein X is an activatable ligand.
-
Specification