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A carbon dioxide gas barrier coating comprising clay dispersed in a polymer composition comprising EVOH, gas barrier materials such as laminate materials (20) including the coating (1) on a substrate (2), methods of enhancing the carbon dioxide barrier properties of materials using the coating, uses

A carbon dioxide gas barrier coating comprising clay dispersed in a polymer composition comprising EVOH, gas barrier materials such as laminate materials (20) including the coating (1) on a substrate (2), methods of enhancing the carbon dioxide barrier properties of materials using the coating, uses of the coating composition in enhancing the gas barrier properties of a substrate packages including the carbon dioxide barrier materials (20) and methods of protecting articles.

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1. A method of preparing a carbon dioxide barrier coating composition comprising mixing: a) a polymer composition comprising; i) a solution or dispersion of EVOH or an EVOH/PVOH mixture; andii) a polycarboxylic acid polymer; with b) a dispersion of clay; wherein the clay is present in an amount of 3

1. A method of preparing a carbon dioxide barrier coating composition comprising mixing: a) a polymer composition comprising; i) a solution or dispersion of EVOH or an EVOH/PVOH mixture; andii) a polycarboxylic acid polymer; with b) a dispersion of clay; wherein the clay is present in an amount of 35 to 50 weight % based on the total solid content of the carbon dioxide barrier coating composition; wherein the carbon dioxide transmission rate of a 12 micron PET substrate coated with the carbon dioxide barrier coating composition is less than or equal to 1.3% of the carbon dioxide transmission rate of the uncoated 12 micron PET substrate, when measured at 23° C. and 0% relative humidity. 2. The method according to claim 1, in which the polycarboxylic acid polymer is present in the amount of 5-20 weight % and the EVOH or PVOH/EVOH is present in the amount of 30-60 weight % of the total solid content of the carbon dioxide barrier coating composition. 3. The method of claim 1 wherein the EVOH is a vinyl alcohol-ethylene copolymer having an ethylene content of less than 20 mol. %. 4. The method of claim 1 wherein the clay dispersion is prepared using a high shear dispersion apparatus selected from a vortex, cavitation, or bead mill type dispersion apparatus. 5. A method of preparing a carbon dioxide barrier material, comprising applying the carbon dioxide barrier coating composition prepared according to the method of claim 1 onto a substrate to form the carbon dioxide barrier coating on the substrate and enhance the carbon dioxide barrier properties of the substrate; wherein the carbon dioxide transmission rate of a 12 micron PET substrate coated with the carbon dioxide barrier coating composition is less than or equal to 1.3% of the carbon dioxide transmission rate of the uncoated 12 micron PET substrate, when measured at 23° C. and 0% relative humidity. 6. The method of claim 5, wherein the step of applying onto the substrate a coating composition is carried out within 24 hours of completing the mixing of (i) the polymer composition with (ii) the dispersion of a clay. 7. The method of claim 5, wherein the substrate is a flexible polymer film. 8. The method of claim 5, wherein: X=A/(B·C)>100, in which:A=Carbon Dioxide Transmission Rate for the substrate at 23° C. and 0% RH without the barrier coating;B=Carbon Dioxide Transmission Rate for the substrate at 23° C. and 0% RH with the barrier coating; andC=Coating Weight in g/m2 (dry). 9. The method of claim 5, wherein the carbon dioxide barrier material is a laminate material comprising a first film, which is the substrate, and a second film, wherein the layer of the carbon dioxide barrier coating composition is present between the first film and a second film. 10. The method of claim 9, wherein: X=(A·D)/(B·C)>200,in which:A=Carbon Dioxide Transmission Rate for the laminate at 23° C. and 50% RH without the barrier coating;B=Carbon Dioxide Transmission Rate for the laminate at 23° C. and 50% RH with the barrier coating;C=Coating Weight in g/m2 (dry); andD=Bond Strength in N/15 mm;wherein the bond strength D is greater than or equal to 1.0 N/15 mm. 11. A packaged article packaged in a carbon dioxide-rich environment, or a packaged carbonated liquid, wherein the packaging comprises a barrier material prepared according to the method of claim 5. 12. A method of protecting an article from spoilage, prolonging the shelf life of an article and/or delaying deterioration of an article comprising packaging the article in a carbon dioxide-rich environment, in a package that comprises a carbon dioxide barrier material prepared in accordance with the method of claim 5.