Packaging for high purity solvents
A container includes an external package and a sealed flexible bag, adapted to hold liquid contents, retained within the external package. The bag is made from a polymer film, which prior to being formed into a bag, was a two dimensional film to which was applied a PECVD SiOx coating.
1. A container comprising an external package and a sealed flexible bag adapted to hold liquid contents retained within the external package, the bag made from a polymer film comprising first and second major surfaces, at least the first major surface of the polymer film having a PECVD SiO x coating, the film having first and second portions heat-sealed together to define a sealed area with the PECVD SiO x coating sandwiched between the first and second heat-sealed portions.
2. The container of claim 1 , wherein the external package comprises one or more rigid or semi-rigid materials selected from the group consisting of plastic, cardboard and a soft metal.
3. The container of claim 1 , wherein the heat-sealed portions consist essentially of polyethylene.
4. The container of claim 1 , wherein the bag holds a high purity solvent.
5. The container of claim 4 , wherein the high purity solvent is hexane.
6. The flexible bag of claim 1 , in which the PECVD SiO x coating functions as an oxygen barrier and consists essentially of SiO x , in which x is from about 1.5 to about 2.9.
7. The flexible bag of claim 6 , in which the PECVD SiO x coating is from 10 to 200 nm thick.
8. The flexible bag of claim 6 , in which the PECVD SiO x coating is on the first major surface only.
9. The flexible bag of claim 8 , in which the PECVD SiO x coating is coextensive with the first major surface.
10. The flexible bag of claim 1 , in which the first and second heat-sealed portions define a lapped seal.
11. The flexible bag of claim 1 , in which the first and second heat-sealed portions define a face-to-face seal.