The present application describes a multilayer film having low water vapor permeability. The multilayer film of the present application is readily thermoformed and is, therefore, suitable for blister packaging sheets as well as for food packaging, medical barriers and device packaging, and other gen
The present application describes a multilayer film having low water vapor permeability. The multilayer film of the present application is readily thermoformed and is, therefore, suitable for blister packaging sheets as well as for food packaging, medical barriers and device packaging, and other general purposes where low water vapor permeability is desired.
대표청구항▼
1. A low water vapor permeability multilayer film for pharmaceutical or medical implement packaging comprising: a. a first layer comprising a first halogen-free, substantially chemically inert polymer;b. a second layer comprising high density polyethylene (HDPE), a nucleating agent, and a hydrocarbo
1. A low water vapor permeability multilayer film for pharmaceutical or medical implement packaging comprising: a. a first layer comprising a first halogen-free, substantially chemically inert polymer;b. a second layer comprising high density polyethylene (HDPE), a nucleating agent, and a hydrocarbon resin;c. a third layer comprising a second halogen-free, substantially chemically inert polymer;d. a tie layer between the first and second layers; ande. a tie layer between the second and third layers;wherein the second layer is between the first and third layers; andwherein the multilayer film has a flat sheet MVTR less than 2.1 g·mil/m2/day when tested per ASTM F1249 at conditions of 100° F. and 90% relative humidity. 2. The film of claim 1, wherein at least one halogen-free, substantially chemically inert polymer of the first layer or the third layer has a melt viscosity from about 28,795 poise to about 48,077 poise at 1 radian/second shear rate at a temperature of about 220° C. 3. The film of claim 2, wherein at least one halogen-free, substantially chemically inert polymer of the first layer or the third layer has a melt viscosity from about 28,795 poise to about 31,826 poise at 1 radian/second shear rate at a temperature of about 220° C. 4. The film of claim 1, wherein at least one halogen-free, substantially chemically inert polymer of the first layer or the third layer is an aromatic polyester. 5. The film of claim 4, wherein the aromatic polyester is PETG. 6. The film of claim 5, wherein the PETG has a melt viscosity from about 28,795 poise to about 48,077 poise at 1 radian/second shear rate at a temperature of about 220° C. 7. The film of claim 6, wherein the PETG has a melt viscosity from about 28,795 poise to about 31,826 poise at 1 radian/second shear rate at a temperature of about 220° C. 8. The film of claim 1, wherein at least one tie layer comprises a tie resin, HDPE, and a nucleating agent. 9. The film of claim 8, wherein the HDPE is present in the at least one tie layer from about 5% to about 25% by weight of the layer. 10. The film of claim 9, wherein the HDPE is present in the at least one tie layer from about 18% to about 22% by weight of the layer. 11. The film of claim 8, wherein the tie resin is present in the at least one tie layer from about 70% to about 95% by weight of the layer. 12. The film of claim 8, wherein the nucleating agent is present in the at least one tie layer from about 0.2% to about 3.5% by weight of the layer. 13. The film of claim 1, wherein the HDPE is present in the second layer from about 60% to about 95% by weight of the layer. 14. The film of claim 1, wherein the hydrocarbon resin is present in the second layer from about 3% to about 16% by weight of the layer. 15. The film of claim 1, wherein the nucleating agent is present in the second layer from about 0.01% to about 3.0% by weight of the layer. 16. The film of claim 1, wherein the nucleating agent comprises zinc glycerolate salts or calcium hexahydrophthalate. 17. The film of claim 16, wherein the nucleating agent comprises calcium hexahydrophthalate. 18. The film of claim 1, wherein the first layer and third layer are each from about 8% to about 10% of the total weight of the film. 19. The film of claim 1, wherein the second layer is from about 68% to about 74% of the total weight of the film. 20. The film of claim 1, wherein each tie layer is from about 4% to about 6% of the total weight of the film. 21. The film of claim 1, wherein the tie layer between the first and second layer and the tie layer between the second and third layer are of substantially the same composition. 22. The film of claim 1, wherein the tie layer between the first and second layer and the tie layer between the second and third layer are of substantially different composition. 23. The film of claim 1, wherein the first and third layers are of substantially the same composition. 24. The film of claim 1, wherein the first and third layers are of substantially different composition. 25. A thermoformed blister package formed from a multilayer film as claimed in claim 1. 26. The blister package of claim 25, wherein the package comprises a plurality of domed receptacle portions.
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