US Patent 7943218 - Environmentally friendly flexible film having a nanocoating

http://www.freepatentsonline.com/7943218.html

Potato chip and other snack foods most often use petroleum based packaging that have a low rate of biodegradability resulting in a poor environmental impact. This patent from Frito-Lay teaches a potential alternative using bio-based nanocoatings. Claim 1 reads:

1. A multi-layer packaging film comprising:

a) an outer layer comprising a first bio-based film;

b) an adhesive layer adjacent to said outer layer; and

c) a product side layer comprising a second bio-based film having a nanocoating between said product side layer and said adhesive layer to provide barrier properties,

wherein said multi-layer packaging film comprises a moisture vapor transmission rate of less than about 5 g/m2/day.