Blister packaging components
The present invention relates to blister components for blister packages formed from multilayer thermoplastic films. In one preferred embodiment of the present invention, the blister component has a layer sequence configuration of A/B/C/B/A. Preferably, layer A is a first exterior layer comprising cyclic olefin copolymer (COC), layer B is an interior layer comprising a high density polyethylene (HDPE), a blend of high density polyethylene, a high density polyethylene nucleation additive and optionally, a hydrocarbon resin (HDPE-Blend), or a bimodal high density polyethylene having a distribution of a low molecular weight region and a high molecular weight region (HDPE-Bimodal), or a high density polyethylene having a thickness of between 38.1 pm to 190.5 pm (1.5 mil to 7.5 mil), layer C is a central core layer. Alternatively, the blister component has a layer sequence configuration of A/B/C/B/D, where layer D is a second exterior layer.
1. A blister component for a blister package, comprising:
a multilayer thermoplastic film comprising:
i. a first exterior layer comprising cyclic olefin copolymer (COC);
ii. two interior layers each comprising a high density polyethylene (HDPE);
iii. a central core layer; and
iv. a second exterior layer comprising a material selected from the group consisting of cyclic olefin copolymer (COC), polypropylene (PP), high impact polystyrene (HIPS), general purpose polystyrene (GPPS), styrene block copolymer (SBC), polyethylene terephthalate (PET), oriented polyethylene terephthalate (OPET), amorphous polyethylene terephthalate (APET), glycol-modified polyethylene terephthalate (PETE) and polylactic acid (PLA).
2. A component according to claim 1 , wherein the multilayer thermoplastic film is palindromic.
3. A component according to claim 1 , wherein the two interior layers each have a thickness of between 38.1 μm to 190.5 μm (1.5 mil to 7.5 mil).
4. A component according to claim 1 , wherein the two interior layers each comprise a bimodal high density polyethylene having a distribution of a low molecular weight region and a high molecular weight region.
5. A component according to claim 1 , wherein the central core layer comprises an ethylene vinyl acetate copolymer.
6. A component according to claim 1 , wherein the central core layer comprises an ethylene vinyl acetate copolymer having a 12% by weight vinyl acetate content.
7. A component according to claim 1 , wherein each of the two interior layers have a thickness of at least 20% of the total thickness of the multilayer thermoplastic film.
8. A component according to claim 1 , wherein each of the two interior layers have a thickness of at least 30% of the total thickness of the multilayer thermoplastic film.
9. A component according to claim 1 , wherein each of the two interior layers have a thickness of at least 35% of the total thickness of the multilayer thermoplastic film.
10. A component according to claim 1 , wherein each of the two interior layers comprises a high density polyethylene having a density of at least about 0.96 g/cm 3 .
11. A component according to claim 1 , wherein the central core layer is in direct contact with the two interior layers.
12. A component according to claim 1 , wherein each of the two interior layers are in direct contact with an exterior layer.
13. A component according to claim 1 , wherein the multilayer thermoplastic film has an average water vapor transmission rate of 0.110 g/m 2 /day at 100° F. (37.8° C.) and 90% relative humidity having a thickness of about 10 mil (254 micron) before being thermoformed.
14. A component according to claim 1 , wherein the two interior layers each further comprise a high density polyethylene nucleation additive.
15. A component according to claim 14 , wherein the two interior layers each further comprise a hydrocarbon resin.