PACKAGING FILMS WITH RECYCLED POLYAMIDE CONTENT
Multicomponent recyclate containing polyamide components can be utilized in packaging films, saving both material and energy resources. Migration of the odorous compounds typically resulting from overprocessed polyamide materials can be minimized or eliminated by introducing odor barrier layers on both sides of the recyclate material. The resulting films have a low odor profile and can be used to package organoleptically sensitive products.
1 . A low odor packaging film comprising:
a) an inner layer comprising a multicomponent recyclate,
b) a first odor barrier layer, and
c) a second odor barrier layer,
wherein the inner layer is between the first and second odor barrier layers, and wherein the first odor barrier layer and the second odor barrier layer each comprise a material having an oxygen transmission rate of less than 150 cm 3 25μm/m 2 day when tested at 23° C. and 50% RH.
2 . (canceled)
3 . A low odor packaging film according to claim 1 wherein the first odor barrier layer comprises at least one of a polyamide or an ethylene vinyl alcohol copolymer.
4 . A low odor packaging film according to claim 1 wherein the second odor barrier layer comprises at least one of a polyamide or an ethylene vinyl alcohol copolymer.
5 . A low odor packaging film according to claim 1 wherein the inner layer further comprises a compatibilizer.
6 . A low odor packaging film according to claim 1 wherein the inner layer further comprises an odorous derivative of caprolactam.
7 . A low odor packaging film according to claim 1 wherein the multicomponent recyclate comprises a polyamide and a polyolefin.
8 . A low odor packaging film according to claim 7 wherein the polyolefin is a polyethylene or a polypropylene.
9 . A low odor packaging film according to claim 7 wherein the multicomponent recyclate further comprises an ethylene vinyl alcohol copolymer.
10 . A low odor packaging film according to claim 1 wherein the first and second odor barrier layers reduce the transmission of odor causing compounds originating from the inner layer such that the packaging film has a low odor profile.
11 . A low odor packaging film according to claim 6 wherein the first and second odor barrier layers reduce the transmission of the odorous derivative of caprolactam from the inner layer such that the packaging film has a low odor profile.
12 . A low odor packaging film according to claim 1 wherein the film has a haze value less than 30%.
13 . A low odor packaging film comprising:
a) a first odor barrier layer,
b) an inner layer comprising a polyamide, a polyolefin and a compatibilizer, and
c) a second odor barrier layer,
wherein the inner layer is positioned between the first and second odor barrier layers.
14 . A low odor packaging film according to claim 13 wherein the first odor barrier layer comprises a polyamide and the second odor barrier layer comprises a polyamide.
15 . A low odor packaging film according to claim 13 wherein the inner layer is directly adjacent to the first odor barrier layer and the second odor barrier layer is directly adjacent to the inner layer.
16 . A low odor packaging film according to claim 13 further comprising:
a) a first polymeric adhesive layer located between the first odor barrier layer and the inner layer, and
b) a second polymeric adhesive layer located between the inner layer and the second odor barrier layer.
17 . A low odor packaging film according to claim 13 wherein the first and second odor barrier layers prevent the transmission of odor causing compounds from the inner layer such that the packaging film has a low odor profile.
18 . A low odor packaging film according to claim 13 wherein the film is thermoformable.
19 . A method of producing low odor packaging film according to claim 13 wherein the polyamide and polyolefin of the inner layer are introduced as an unseparated multicomponent recyclate.
20 . A low odor packaging film comprising:
a) an inner layer comprising recycled polyamide,
b) a first odor barrier layer, and
c) a second odor barrier layer,
wherein the inner layer is between the first and second odor barrier layers.