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US 10,071,895 B2Granted
Hot fill process with closures made from high density unimodal polyethylene
AssigneeNOVA Chemicals (International) S.A.
InventorsXiaoChuan Wang, Mark Rejman, Ronald William Lewoniuk, Ian Robert Gibbons, Eric Paul Brusset
Life of this patent
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Abstract
High density (density ≥0.945 g/cm3) unimodal polyethylene compositions for use in hot-fill closures and processes.
Claims40
A process to fill a container, the process comprising:
- adding a hot liquid to the container through a container opening, sealing the container opening with a closure comprising a unimodal polyethylene composition, and bringing the hot liquid into contact with an interior surface of the closure;
- wherein the unimodal polyethylene composition has a density from 0.945 to 0.967 g/cm3;
- a melt index, I2 of from 2.5 to 20.0 g/10 min;
- a weight average molecular weight (Mw) from 25,000 to 85,000 g/mol;
- and a molecular weight distribution Mw/Mn of from 2.2 to 4.2.
2 more elements
Use of a closure in a hot fill process, wherein the closure comprises a unimodal polyethylene composition having a density from 0.945 to 0.967 g/cm3;
- a melt index, I2 of from 2.5 to 20.0 g/10 min;
- a weight average molecular weight (Mw) from 25,000 to 85,000 g/mol;
- and a molecular weight distribution Mw/Mn of from 2.2 to 4.2.
A process to fill a container, the process comprising:
- adding a hot liquid to the container through a container opening;
- sealing the container opening with a closure comprising a unimodal polyethylene composition having a density from 0.945 to 0.967 g/cm3;
- a melt index, I2 of from 2.5 to 20.0 g/10 min;
- a weight average molecular weight (Mw) from 25,000 to 85,000 g/mol;
- and a molecular weight distribution Mw/Mn of from 2.2 to 4.2;
- and bringing the hot liquid into contact with an interior surface of the closure;
- wherein the closure has a time exponent, m of 0.114 or less where m is determined using a compressive strain model represented by the equation:
- ε=A×σn×tm
- where ε is the compressive strain;
- σ is the stress in N/cm2, t is the loading time in seconds, A is the model coefficient, n is the deformation stress exponent and m is the time exponent.
7 more elements
Use of a closure in a hot fill process, wherein the closure comprises a unimodal polyethylene composition having a density from 0.945 to 0.967 g/cm3;
- a melt index, I2 of from 2.5 to 20.0 g/10 min;
- a weight average molecular weight (Mw) from 25,000 to 85,000 g/mol;
- a molecular weight distribution Mw/Mn of from 2.2 to 4.2;
- wherein the closure has a time exponent, m of 0.114 or less, where m is determined using a compressive strain model represented by the equation:
- ε=A×σn×tm
- where ε is the compressive strain;
- σ is the stress in N/cm2, t is the loading time in seconds, A is the model coefficient, n is the deformation stress exponent and m is the time exponent.
4 more elements
Dependencies are inferred from the claim text.