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A composite structure, which includes: a. a foam sheet comprising polyolefin; and b. a film sheet adhered to the foam sheet, wherein the film sheet (1) comprises polypropylene,(2) is stretch-oriented in at least one direction,(3) has a thickness of less than 0.9 mil, and(4) has a larger surface

A composite structure, which includes: a. a foam sheet comprising polyolefin; and b. a film sheet adhered to the foam sheet, wherein the film sheet (1) comprises polypropylene,(2) is stretch-oriented in at least one direction,(3) has a thickness of less than 0.9 mil, and(4) has a larger surface area than the foam sheet such that at least one edge of the film sheet extends beyond a corresponding edge of the foam sheet.

대표청구항 ▼

1. A composite structure, comprising: a. a foam sheet comprising polyolefin; and b. a film sheet adhered to said foam sheet, wherein said film sheet (1) comprises polypropylene,(2) is stretch-oriented in at least one direction,(3) has a thickness of less than 0.9 mil, and(4) has a larger surfa

1. A composite structure, comprising: a. a foam sheet comprising polyolefin; and b. a film sheet adhered to said foam sheet, wherein said film sheet (1) comprises polypropylene,(2) is stretch-oriented in at least one direction,(3) has a thickness of less than 0.9 mil, and(4) has a larger surface area than said foam sheet such that at least one edge of said film sheet extends beyond a corresponding edge of said foam sheet.2. The composite structure of claim 1, wherein said polyolefin foam sheet comprises polyethylene homopolymer or copolymer.3. The composite structure of claim 2, wherein said polyolefin foam sheet has a density ranging from about 1 to about 10 pounds/ft3and a thickness ranging from about 0.004 to about 2 inches.4. The composite structure of claim 1, wherein said film sheet is stretch-oriented in at least two directions.5. The composite structure of claim 4, wherein said film sheet has an orientation ratio of at least 2 in both of said at least two directions.6. The composite structure of claim 1, wherein said film has a thickness 0.6 mil or less.7. The composite structure of claim 1, wherein said film includes at least a first layer comprising said polypropylene and a second layer interposed between and bonding said film and foam sheets.8. The composite structure of claim 7, wherein said foam sheet and film sheet are adhered via heat lamination.9. The composite structure of claim 1, wherein said composite structure has a maximum water vapor transmission rate of 0.6 grams/100 in2per 24 hours @ 100° F. and 90% relative humidity.10. The composite structure of claim 9, wherein said composite structure has a maximum water vapor transmission rate of 0.5 grams/100 in2per 24 hours @ 100° F. and 90% relative humidity.11. A method for making a composite structure, comprising: a. providing a foam sheet comprising polyolefin; and b. providing a film sheet and adhering said film sheet to said foam sheet, wherein said film sheet (1) comprises polypropylene,(2) is stretch-oriented in at least one direction,(3) has a thickness of less than 0.9 mil, and(4) has a larger surface area than said foam sheet such that at least one edge of said film sheet extends beyond a corresponding edge of said foam sheet.12. The method of claim 11, wherein said polyolefin foam sheet comprises polyethylene homopolymer or copolymer.13. The method of claim 12, wherein said polyolefin foam sheet has a density ranging from about 1 to about 10 pounds/ft3and a thickness ranging from about 0.004 to about 2 inches.14. The method of claim 11, wherein said film sheet is stretch-oriented in at least two directions.15. The method of claim 14, wherein said film sheet has an orientation ratio of at least 2 in both of said at least two directions.16. The method of claim 11, wherein said film has a thickness 0.6 mil or less.17. The method of claim 11, wherein said film includes at least a first layer comprising said polypropylene and a second layer interposed between and bonding said film and foam sheets.18. The method of claim 17, wherein said foam sheet and film sheet are adhered via heat lamination.19. The method of claim 11, wherein said composite structure has a maximum water vapor transmission rate of 0.6 grams/100 in2per 24 hours @ 100° F. and 90% relative humidity.20. The method of claim 19, wherein said composite structure has a maximum water vapor transmission rate of 0.5 grams/100 in2per 24 hours @ 100° F. and 90% relative humidity.