Use of poly(dimethyl ketone) to manufacture articles in direct contact with a humid or aqueous medium
View Patent ↗The invention relates to the use of a structure for manufacturing hermetical industrial or food packaging in direct contact with a humid or aqueous medium, the structure comprising at least one layer of polydimethyl ketone in direct contact with the most humid medium, (i) the latter being situated within the packaging when the packaging accommodates water or an aqueous or humid product and (ii) the most humid medium being situated outside the packaging when the packaging accommodates a product which is dry or which is to be protected from humidity. The food packaging comprises, for example, trays, sachets, bottles and flasks and the industrial packaging comprises, for example, pipes, containers and drums.
1. A method of preventing water or hydrophilic liquid exchange in hermetical industrial or food packaging for use in direct contact with a humid or aqueous medium, comprising placing a barrier film in a locus where water or a hydrophilic liquid is present, wherein said barrier film comprises at least one layer of a polydimethyl ketone polymer (A) comprising repeating units of:
wherein the A2/(A1+A2) molar ratio is between 0 and 30 percent.
2. The method of claim 1 wherein said polydimethyl ketone layer is situated on the inside of said packaging when said packaging contains water, and aqueous product, or a humid product.
3. The method of claim 1 wherein said polydimethyl ketone layer is situated on the outside of said packaging when the packaging contains a product to be protected from humidity.
4. The method of claim 1 wherein said A2/(A1+A2) molar ratio is between 5 and 15 percent.
5. An article comprising a structure having at least one layer of a polydimethyl ketone polymer (A) comprising repeating units of:
wherein the A2/(A1+A2) molar ratio is between 0 and 30 percent, and
wherein said structure is in direct contact with water or a hydrophilic liquid.
6. The article of claim 5 wherein said A2/(A1+A2) molar ratio is between 5 and 15 percent.
7. The article of claim 5 comprising a multilayer structure comprising said polydimethyl ketone polymer (A) layer and one or more layers (B) of at least one other polymer.
8. The article of claim 7 wherein said multiplayer structure further comprises a tie between the layers of the polydimethyl ketone polymer (A) and polymer layer (B).
9. The article of claim 5 wherein said polydimethyl ketone polymer (A) layer has a thickness of from 5 to 10,000 μm.
10. The article of claim 5 wherein said polydimethyl ketone polymer (A) layer has a thickness of from 5 to 30 μm.
11. The article of claim 7 wherein said polymer layer (B) has a thickness of from 15 μm to 5 mm.
12. The article of claim 5 comprising a food or industrial packaging article selected from the group consisting of a tray, a sachet, a bottle, a flask, a pipe, a container, and a drum.
13. The article of claim 5 wherein said article comprises hermetical industrial or food packaging.
14. The article of claim 13 wherein said polydimethyl ketone polymer (A) layer is situated on the inside of said packaging when said packaging contains water, and aqueous product, or a humid product.
15. The article of claim 13 wherein said polydimethyl ketone polymer (A) layer is situated on the outside of said packaging when the packaging contains a product to be protected from humidity.