Antimicrobial packaging films
The present invention is directed to a thermoplastic packaging film coated with an antimicrobial coating, a method for the preparation of the coated film and packaging articles made with the film.
1. Thermoplastic packaging film having at least one surface coated with a coating containing lauric arginate ethyl ester, wherein said coating does not contain any polymer.
2. The thermoplastic packaging film according to claim 1 , wherein said coating comprises at least 40 wt % of lauric arginate ethyl ester.
3. The thermoplastic packaging film according to claim 1 , wherein said lauric arginate ethyl ester is present on the coated surface of the film in an amount of at least 0.2 g/sqm.
4. The thermoplastic packaging film according to claim 1 , wherein said coating further contains at least one further antimicrobial agent, selected from cetylpyridinium chloride and dried vinegar and/or an odour absorber.
5. The thermoplastic packaging film according to claim 4 , wherein said further antimicrobial agent is cetylpyridinium chloride, contained in an amount comprised between 3 and 18 wt %.
6. The thermoplastic packaging film according to claim 4 , wherein said odour absorber is zeolite, contained in an amount between 10 and 50 wt %.
7. The thermoplastic packaging film according to claim 1 , wherein one surface of the film is coated with said coating.
8. The thermoplastic packaging film according to claim 1 , wherein both surfaces of the film are coated with said coating.
9. The thermoplastic packaging film according to claim 1 , wherein the film is a heat sealable film, and a surface of the sealant layer of the film is coated with said coating.
10. The thermoplastic packaging film according to claim 1 , wherein the film is mono or biaxially oriented.
11. The thermoplastic packaging film according to claim 1 , wherein the film is heat-shrinkable and has a percentage of free shrink at 90° C. of at least 10% in longitudinal and/or in transverse direction, measured according to ASTM D2732.
12. Method for the preparation of a thermoplastic packaging film having at least one surface, wherein a coating composition containing lauric arginate ethyl ester is applied to at least one surface of the film, wherein said coating composition does not contain any polymer.
13. The method according to claim 12 , further comprising, prior to the application of the coating composition, a step of corona treating or plasma treating the at least one surface of the film to be coated.
14. The method according to claim 12 , wherein the coating composition is a solution or a dispersion of lauric arginate ethyl ester in a liquid vehicle comprising between 5 and 30 wt % of water and one or more water miscible organic solvents with a weight ratio between water and the organic solvents between 1:7 and 1:9, and the application of the coating composition is followed by the removal of the liquid vehicle.
15. The method as claimed in claim 14 , wherein said solution or dispersion contains an amount of lauric arginate ethyl ester between 1 and 30 wt % and optionally contains one or more further antimicrobial agents, including cetylpyridinium chloride and/or an odour absorber.
16. The method as claimed in claim 14 , wherein said one or more water miscible organic solvents are selected from C 1 -C 4 alcohols and C 1 -C 4 esters and mixtures thereof.
17. The method according to claim 12 , wherein the coating composition is a powder comprising at least 90 wt % lauric arginate ethyl ester and application of the coating is carried out by Vapour Deposition.
18. A solution or a dispersion of lauric arginate ethyl ester in a liquid vehicle containing a mixture of water, ethanol, isopropyl alcohol and ethyl acetate, between 5 and 30 wt % of water and between 30 and 40 wt % of ethanol, between 12 and 20 wt % of isopropyl alcohol and between 15 and 25 wt % of ethyl acetate, wherein said solution does not contain any polymer.
19. An article for packaging made from a thermoplastic film having at least one surface coated with a coating containing lauric arginate ethyl ester, wherein said coating does not contain any polymer, optionally comprising a product packaged therein.
20. The article for packaging according to claim 19 , which is a flexible container obtained by self-sealing a coated thermoplastic film or by sealing two thermoplastic films, wherein at least one surface of the two thermoplastic films facing an inside of the container is/are coated and optionally the container is shrunk around the product.