Bio-Based In-Line High Barrier Metalized Film and Process for its Production
Bio-based high barrier metalized film such as PLA or PHA has an adhesion layer coated or co-extruded with the bio-based film and a metal oxide is disposed on the adhesion layer. The adhesion layer can be a co-extruded polyethylene terephthalate, nylon, polyglycolic acid, or ethylene vinyl alcohol. The adhesion layer can have a coating of EVOH, a nylon/EVOH blend, PVOH, PVOH/EAA mixtures, or a primer.
1 . A composite for use on a product side of a multi-layer packaging film, said composite comprising a bio-based layer selected from PLA, PHA, and mixtures thereof and an adhesion layer having a metal, metal oxide, metalloid oxide, or combinations thereof deposited thereon.
2 . The composite of claim 1 wherein said adhesion layer and said bio-based layer is co-extruded.
3 . The composite of claim 2 wherein said bio-based film layer comprises a sealant layer comprising amorphous PLA.
4 . The composite of claim 2 wherein said adhesion layer comprises amorphous PET.
5 . The composite of claim 2 wherein said adhesion layer comprises PGA.
6 . The composite of claim 2 wherein said adhesion layer comprises EVOH.
7 . The composite of claim 2 wherein said adhesion layer comprises nylon.
8 . The composite of claim 7 wherein said adhesion layer further comprises an EVOH coating.
9 . The composite of claim 1 further comprising a bio-based adhesive.
10 . The composite of claim 1 wherein said adhesion layer is coated onto said bio-based layer.
11 . The composite of claim 10 wherein said adhesion layer comprises EVOH.
12 . The composite of claim 10 wherein said adhesion layer comprises PVOH.
13 . The composite of claim 10 wherein said adhesion layer comprises a PVOH/EAA mixture.
14 . The composite of claim 10 wherein said adhesion layer comprises a primer layer.
15 . The composite of claim 1 wherein said bio-based layer comprises PLA.
16 . The composite of claim 1 wherein said bio-based layer comprises PHA.
17 . A method for making a bio-based barrier film comprising the steps of:
a) applying an adhesion layer to a bio-based layer selected from PLA, PHA, and mixtures thereof;
b) applying a barrier layer to said adhesion layer.
18 . The method of claim 17 wherein said adhesion layer is co-extruded with said bio-based layer.
19 . The method of claim 18 wherein said adhesion layer comprises one or more polymers selected from amorphous PET, PGA, EVOH, nylon, and mixtures thereof.
20 . The method of claim 17 wherein said adhesion layer is coated onto said bio-based layer.
21 . The method of claim 20 wherein said adhesion layer comprises one or more polymers selected from EVOH, PVOH, a PVOH/EAA mixture, and a primer.