Use of a structure based on poly(dimethylketene) and objects comprising this structure
AssigneeAtofina
InventorsHélène Egret, Claude Bunel, Jean-Pierre Couvercelle, Michaël Werth, Yves Germain
Life of this patent
Estimating the term…
Abstract
A structure comprising at least one layer of a polymer (A) comprising: the units (A1) and the units (A2) wherein the A2/(A1+A2) molar ratio is between 0 and 30% is a barrier against oxygen permeation under high relative humidity, making the structure useful for packaging and hollow bodies, such as pipes, bottles and containers.
Claims21
In a method of preventing oxygen from permeating through a barrier film, comprising placing said barrier film in a locus wherein oxygen is present, the improvement comprising employing as said barrier film at least one layer of a polymer (A) comprising repeating units of:
- wherein the A2/(A1+A2) molar ratio of the units (A1) and (A2) is between 0 and 30%, and
- wherein the permeability of said layer to O2 at 75% RH/permeability to O2 at 0% RH ratio is between 1.2 and 2.
In a method of preventing oxygen from permeating through a barrier film, comprising placing said barrier film in a locus wherein oxygen is present, the improvement comprising employing as said barrier film at least one layer of a polymer (A) comprising repeating units of:
- wherein the A2/(A1+A2) molar ratio of the units (A1) and (A2) is between 0 and 30%, and
- wherein the permeability of said layer to O2 expressed in cm3/m2, 24 h, 105 Pa, 70 μm, is between 0.15 and 0.20 at 23° C. and 0% RH.
In a method of preventing oxygen from permeating through a barrier film, comprising placing said barrier film in a locus wherein oxygen is present, the improvement comprising employing as said barrier film at least one layer of a polymer (A) comprising repeating units of:
- wherein the A2/(A1+A2) molar ratio of the units (A1) and (A2) is between 0 and 30%, and
- wherein the permeability of said layer to O2 at 95% RH/permeability to O2 at 0% RH ratio is between 1.4 and 2.5.
In a method of preventing oxygen from permeating through a barrier film, comprising placing said barrier film in a locus wherein oxygen is present, the improvement comprising employing as said barrier film at least one layer of a polymer (A) comprising repeating units of:
- wherein the A2/(A1+A2) molar ratio of the units (A1) and (A2) is between 0 and 30%, and
- wherein the permeability of said layer to O2 expressed in cm3/m2, 24 h, 105 Pa, 70 μm, is 0.2 to 1 at 23° C. and 75% RH.
In a method of preventing oxygen from permeating through a barrier film, comprising placing said barrier film in a locus wherein oxygen is present, the improvement comprising employing as said barrier film at least one layer of a polymer (A) comprising repeating units of:
- wherein the A2/(A1+A2) molar ratio of the units (A1) and (A2) is between 0 and 30%, and
- wherein the permeability of said layer to O2 at 75% RH/permeability to O2 at 0% RH ratio is between 1.2 and 2 when measured at a layer thickness of 5 to 150 μm.
Dependencies are inferred from the claim text.