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US 11,149,137 B2Granted
Polyethylene copolymer compositions and articles with barrier properties
AssigneeNOVA Chemicals (International) S.A.
InventorsXiaoChuan Wang, Stephen Salomons
Life of this patent
Estimating the term…
Abstract
A dual reactor solution polymerization process gives high density polyethylene compositions containing a first ethylene copolymer and a second ethylene copolymer. The polyethylene compositions can be used in the manufacture of injection molded closures or cast film having good barrier properties.
Claims34
A polyethylene copolymer composition comprising:
- (1) 90 to 30 wt % of a first ethylene copolymer having a melt index I2, of from 0.1 to 10 g/10 min;
- a molecular weight distribution Mw/Mn, of less than 3.0;
- and a density of from 0.930 to 0.960 g/cm3;
- and
- (2) 10 to 70 wt % of a second ethylene copolymer having a melt index I2, of greater than 10,000 g/10 min;
- a molecular weight distribution Mw/Mn, of less than 3.0;
- and a density higher than the density of the first ethylene copolymer, but less than 0.980 g/cm3;
- wherein the density of the second ethylene copolymer is less than 0.037 g/cm3 higher than the density of the first ethylene copolymer;
- a ratio (SCB1/SCB2) of a number of short chain branches per thousand carbon atoms in the first ethylene copolymer (SCB1) to a number of short chain branches per thousand carbon atoms in the second ethylene copolymer (SCB2) is greater than 2.0;
- and wherein the polyethylene copolymer composition has a molecular weight distribution Mw/Mn, of from 2.0 to 10.0;
- a density of at least 0.949 g/cm3;
- a high load melt index I21, of at least 300 g/10 min;
- a Z-average molecular weight Mz, of less than 200,000;
- a melt flow ratio I21/I2, of from 22 to 50;
- and a stress exponent of less than 1.40.
12 more elements
A polyethylene copolymer composition comprising:
- (1) 90 to 30 wt. % of a first ethylene copolymer having a melt index I2, of from 0.1 to 10 g/10 min;
- a molecular weight distribution Mw/Mn, of less than 3.0;
- and a density of from 0.930 to 0.960 g/cm3;
- and
- (2) 10 to 70 wt % of a second ethylene copolymer having a melt index I2, of greater than 10,000 g/10 min;
- a molecular weight distribution Mw/Mn, of less than 3.0;
- and a density higher than the density of the first ethylene copolymer, but less than 0.980 g/cm3;
- wherein the density of the second ethylene copolymer is less than 0.037 g/cm3 higher than the density of the first ethylene copolymer;
- a ratio (SCB1/SCB2) of a number of short chain branches per thousand carbon atoms in the first ethylene copolymer (SCB1) to a number of short chain branches per thousand carbon atoms in the second ethylene copolymer (SCB2) is greater than 2.0;
- and wherein the polyethylene copolymer composition has a molecular weight distribution Mw/Mn, of from 2.0 to 10.0;
- a density of at least 0.949 g/cm3;
- a high load melt index I21, of at least 300 g/10 min;
- a Z-average molecular weight Mz, of less than 200,000;
- a melt flow ratio I21/I2, of from 22 to 50;
- and a stress exponent of less than 1.40;
- wherein the polyethylene copolymer composition is made by a process comprising contacting at least one single site polymerization catalyst system with ethylene under solution polymerization conditions in at least two polymerization reactors.
13 more elements
A process to prepare a polyethylene copolymer composition, the polyethylene copolymer composition comprising:
- (1) 90 to 30 wt % of a first ethylene copolymer having a melt index I2, of from 0.1 to 10 g/10 min;
- a molecular weight distribution Mw/Mn, of less than 3.0;
- and a density of from 0.930 to 0.960 g/cm3;
- and
- (2) 10 to 70 wt % of a second ethylene copolymer having a melt index I2, of greater than 10,000 g/10 min;
- a molecular weight distribution Mw/Mn, of less than 3.0;
- and a density higher than the density of the first ethylene copolymer, but less than 0.980 g/cm3;
- wherein the density of the second ethylene copolymer is less than 0.037 g/cm3 higher than the density of the first ethylene copolymer;
- a ratio (SCB1/SCB2) of a number of short chain branches per thousand carbon atoms in the first ethylene copolymer (SCB1) to a number of short chain branches per thousand carbon atoms in the second ethylene copolymer (SCB2) is greater than 2.0;
- and wherein the polyethylene copolymer composition has a molecular weight distribution Mw/Mn, of from 2.0 to 10.0;
- a density of at least 0.949 g/cm3;
- a high load melt index I21, of at least 300 g/10 min;
- a Z-average molecular weight Mz, of less than 200,000;
- a melt flow ratio I21/I2, of from 22 to 50;
- and a stress exponent of less than 1.40;
- wherein the process comprises contacting at least one single site polymerization catalyst system with ethylene and at least one alpha-olefin under solution polymerization conditions in at least two polymerization reactors.
13 more elements
A polymer composition comprising from 1 to 100 percent by weight of a polyethylene copolymer composition, the polyethylene copolymer composition comprising:
- (1) 90 to 30 wt % of a first ethylene copolymer having a melt index I2, of from 0.1 to 10 g/10 min;
- a molecular weight distribution Mw/Mn, of less than 3.0;
- and a density of from 0.930 to 0.960 g/cm3;
- and
- (2) 10 to 70 wt % of a second ethylene copolymer having a melt index I2, of greater than 10,000 g/10 min;
- a molecular weight distribution Mw/Mn, of less than 3.0;
- and a density higher than the density of the first ethylene copolymer, but less than 0.980 g/cm3;
- wherein the density of the second ethylene copolymer is less than 0.037 g/cm3 higher than the density of the first ethylene copolymer;
- a ratio (SCB1/SCB2) of a number of short chain branches per thousand carbon atoms in the first ethylene copolymer (SCB1) to a number of short chain branches per thousand carbon atoms in the second ethylene copolymer (SCB2) is greater than 2.0;
- and wherein the polyethylene copolymer composition has a molecular weight distribution Mw/Mn, of from 2.0 to 10.0;
- a density of at least 0.949 g/cm3;
- a high load melt index I21, of at least 300 g/10 min;
- a Z-average molecular weight Mz, of less than 200,000;
- a melt flow ratio I21/I2, of from 22 to 50;
- and a stress exponent of less than 1.40.
12 more elements
Dependencies are inferred from the claim text.