Polymeric film comprising quiet layer with improved noise dampening properties
View Patent ↗The presently disclosed subject matter is directed to polymeric films suitable for use in a wide variety of applications, such as the formation of ostomy bags, incontinence bags, medical collection bags, and the like. Specifically, the disclosed films comprise at least one barrier layer. At least one quiet layer positioned adjacent to the barrier layer incorporates sound dampening polymers. As a result, the disclosed films maintain improved sound dampening, as well as exemplary barrier characteristics and high tensile strength compared to prior art barrier films.
1. A multilayer film comprising:
a. a barrier layer; and
b. at least one quiet layer positioned adjacent to the barrier layer, said quiet layer comprising:
i. a polymer blend having 10 to 20 weight percent of an unhydrogenated styrene-isoprene-styrene block copolymer and 10 to 20 weight percent of a hydrogenated styrene-ethylene-propylene-styrene block copolymer, and
ii. 60 to 80 weight percent ethylene ester vinyl acetate copolymer, based on the total weight of the layer; wherein said quiet layer has a tangent delta value of at least 0.10 at a temperature range of about 25° C. to 40° C., in accordance with ASTM D-4065 and said film exhibits a tensile strength of about 150 to 400 kg/m 2 , measured in accordance with ASTM 882-12.
2. The film of claim 1 , wherein said at least one quiet layer is positioned directly adjacent to said barrier layer.
3. The film of claim 1 , wherein said film has an oxygen transmission rate of less than about 400 cc/m 2 /day-atm, measured in accordance with ASTM D-3925.
4. The film of claim 1 , wherein said quiet layer has a tangent delta value of about 0.1 to 0.4 at a temperature range of about −25° C. to 40° C., in accordance with ASTM D-4065.
5. The film of claim 1 , wherein the barrier layer comprises about 100 weight percent PVDC, based on the total weight of the layer.
6. The film of claim 5 , wherein the PVDC comprises about 51-99 weight percent vinylidene chloride and about 1-49 weight percent unsaturated monomer or comonomer.
7. The film of claim 1 , further comprising first and second exterior layers comprising about 60-80 weight percent ethylene ester copolymer and about 20-40 weight percent ethylene/alpha-olefin, based on the total weight of the layer.
8. The film of claim 1 , wherein the quiet layer contains no ethylene/alpha-olefin.
9. A method of constructing a pouch, said method comprising:
a. providing a multilayer film comprising
a barrier layer; and
at least one quiet layer positioned adjacent to the barrier layer, said quiet layer comprising:
i. a polymer blend having 10 to 20 weight percent of an unhydrogenated styrene-isoprene-styrene block copolymer and 10 to 20 weight percent of a hydrogenated styrene-ethylene-propylene-styrene block copolymer, and
ii. 60 to 80 weight percent ethylene vinyl acetate copolymer, based on the total weight of the layer;
wherein said quiet layer has a tangent delta value of at least 0.10 at a temperature range of about −25° C. to 40° C., in accordance with ASTM D-4065; and
wherein said film exhibits a tensile strength of about 150 to 400 kg/m 2 , measured in accordance with ASTM 882-12; and
b. using said film to form a pouch comprising a first wall and a second wall joined together to define a closed compartment having an interior.
10. The method of claim 9 , wherein the at least one quiet layer of the film is positioned directly adjacent to the barrier layer.
11. The method of claim 9 , wherein said film has an oxygen transmission rate of less than about 400 cc/m 2 -day-atm, measured in accordance with ASTM D-3925.
12. The method of claim 9 , wherein said quiet layer has a tangent delta value of about 0.1 to 0.4 at a temperature range of about −25° C. to 40° C., in accordance with ASTM D-4065.
13. The method of claim 9 , wherein the barrier layer of said film comprises about 100 weight percent PVDC.
14. A pouch constructed from the film of claim 1 , the pouch being selected from one of the following: colostomy bag, ileostomy bag, incontinence bag, medical collection bag, parenteral solution bag, or food packaging bag.
15. The pouch of claim 14 , wherein the at least one quiet layer of the film is positioned directly adjacent to the barrier layer.
16. The pouch of claim 14 , wherein said film has an oxygen transmission rate of less than about 400 cc/m2-day-atm, measured in accordance with ASTM D-3925.
17. The pouch of claim 14 , wherein said quiet layer has a tangent delta value of about 0.1 to 0.4 at a temperature range of about −25° C. to 40° C., in accordance with ASTM D-4065.
18. The pouch of claim 14 , wherein the barrier layer of said film comprises about 100 weight percent PVDC.