Back to results
US 12,163,012 B2Granted
Polyethylene compositions and articles with good barrier properties
AssigneeNOVA Chemicals (International) S.A.
InventorXiaochuan Wang
Life of this patent
Estimating the term…
Abstract
A dual reactor solution polymerization process gives polyethylene compositions containing a first ethylene copolymer and a second ethylene copolymer and which has a balance of barrier properties, toughness and environmental resistance. The polyethylene compositions are suitable for end use applications which may benefit from low oxygen transmission rates such as closures for bottles or barrier film.
Claims26
A polyethylene copolymer composition comprising:
- (1) 10 to 70 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 0.900 to 0.946 g/cm3;
- and
- (2) 90 to 30 wt % of a second ethylene copolymer having a melt index I2, of from 25 to 1,500 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 0.970 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 1.0;
- and wherein the polyethylene copolymer composition has a molecular weight distribution Mw/Mn, of from 1.8 to 7.0;
- a density of less than 0.949 g/cm3;
- a high load melt index I21, of at least 150 g/10 min;
- a Z-average molecular weight Mz, of less than 200,000;
- a melt flow ratio I21/I2, of from 20 to 50;
- a stress exponent of less than 1.40;
- and an ESCR Condition B (100% IGEPAL) of at least 3.5 hours;
- and wherein the polyethylene copolymer composition further comprises a nucleating agent.
15 more elements
A closure for bottles, the closure comprising a polyethylene copolymer composition comprising:
- (1) 10 to 70 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 0.900 to 0.946 g/cm3;
- and
- (2) 90 to 30 wt % of a second ethylene copolymer having a melt index I2, of from 25 to 1,500 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 0.970 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 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 1.0;
- and wherein the polyethylene copolymer composition has a molecular weight distribution Mw/Mn, of from 1.8 to 7.0;
- a density of less than 0.949 g/cm3;
- a high load melt index I21, of at least 150 g/10 min;
- a Z-average molecular weight Mz, of less than 200,000;
- a melt flow ratio I21/I2, of from 20 to 50;
- a stress exponent of less than 1.40;
- and an ESCR Condition B (100% IGEPAL) of at least 3.5 hours;
- and wherein the polyethylene copolymer composition further comprises a nucleating agent.
14 more elements
A film, the film comprising a polyethylene copolymer composition comprising:
- (1) 10 to 70 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 0.900 to 0.946 g/cm3;
- and
- (2) 90 to 30 wt % of a second ethylene copolymer having a melt index I2, of from 25 to 1,500 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 0.970 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 1.0;
- and wherein the polyethylene copolymer composition has a molecular weight distribution Mw/Mn, of from 1.8 to 7.0;
- a density of less than 0.949 g/cm3;
- a high load melt index I21, of at least 150 g/10 min;
- a Z-average molecular weight Mz, of less than 200,000;
- a melt flow ratio I21/I2, of from 20 to 50;
- a stress exponent of less than 1.40;
- and an ESCR Condition B (100% IGEPAL) of at least 3.5 hours;
- and wherein the polyethylene copolymer composition further comprises a nucleating agent.
14 more elements
Dependencies are inferred from the claim text.