Packaging for high purity solvents
View Patent ↗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 flexible bag comprising
at least one film sheet having major surface portions,
a barrier coating having a thickness of from 2 to 1000 nanometers on at least one major surface portion, and
at least one seal between facing major surface portions,
the at least one film sheet and at least one seal defining a flexible bag comprising a lumen, with the barrier coating facing the lumen and extending into the seal;
in which the barrier coating consists essentially of SiO x , in which x is from about 1.5 to about 2.9.
2. The flexible bag of claim 1 , in which each of the facing major surface portions is at least partially coated with the barrier coating.
3. The flexible bag of claim 1 , in which the seal comprises a lapped seal.
4. The flexible bag of claim 1 , in which the seal comprises a face-to-face seal.
5. The flexible bag of claim 1 , in which the seal comprises a side seal.
6. The flexible bag of claim 1 , in which the seal comprises an end seal.
7. The flexible bag of claim 1 , formed from a single film sheet joined by a side seal and first and second end seals.
8. The flexible bag of claim 1 , formed from first and second film sheets joined by a perimeter seal.
9. The flexible bag of claim 1 , further comprising an external package receiving and supporting at least a portion of the flexible bag.
10. The flexible bag of claim 1 , further comprising a spout for draining the flexible bag.
11. The flexible bag of claim 10 , in which the spout further comprises a valve.
12. The flexible bag of claim 1 , further comprising a solvent contained within the lumen, for example acetonitrile, dichloromethane (methylene chloride), ethyl ether, hexane, methanol, toluene, acetone, benzene, chloroform, diethyl ether, dimethylformamide, dimethyl sulfoxide, ethanol, heptane, isopropanol, pyridine, tetrahydrofuran, water, or a mixture of any two or more of these.
13. The flexible bag of claim 1 , in which the film sheet comprises polyethylene.
14. The flexible bag of claim 1 , in which the barrier coating is from 10 to 100 nm thick.
15. The flexible bag of claim 1 , which is contained inside a container comprising an external package and the sealed flexible bag adapted to hold liquid contents retained within the external package, the bag comprising a polymer film, which prior to being formed into a bag, was a two dimensional film to which was applied a PECVD SiO x coating.
16. The flexible bag of claim 15 , 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.
17. The flexible bag of claim 15 , wherein the polymer film is polyethylene.
18. The flexible bag of claim 15 , wherein the bag holds a high purity solvent.
19. The flexible bag of claim 18 , wherein the high purity solvent is hexane.