Barrier composite films and a method for producing the same
First Claim
1. A barrier composite film which comprises a base film layer, an inorganic thin layer having a thickness of 100 to 5,000 Å
- formed on at least one side of said base film layer, and a gas barrier resin coating layer containing a silane coupling agent formed on said inorganic thin layer.
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Accused Products
Abstract
At least one side of a polyester or other base film is successively covered with an inorganic layer composed of a silicon oxide or the like and a coating layer comprising a silane coupling agent and a barrier resin (e.g. vinylidene chloride-based copolymer, ethylene-vinyl alcohol copolymer) to provide a barrier composite film. The amount of the silane coupling agent is about 0.05 to 10 parts by weight relative to 100 parts by weight of the barrier resin. A heat-sealing layer is optionally formed on the surface of the barrier resin coating layer or on the other side of the base film. Such barrier composite film has excellent transparency and retains high barrier properties and adhesive properties of covering layer despite its thin covering layer.
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Citations
24 Claims
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1. A barrier composite film which comprises a base film layer, an inorganic thin layer having a thickness of 100 to 5,000 Å
- formed on at least one side of said base film layer, and a gas barrier resin coating layer containing a silane coupling agent formed on said inorganic thin layer.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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11. A barrier composite film according to claim 10, wherein the hydrocarbon group represented by R is a C1-4 alkylene group, or C5-8 cycloalkene-C1-4 alkyl residue, the double bond of said cycloalkene being epoxidated, and X is the same or different methoxy group or ethoxy group.
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12. A barrier composite film according to claim 10, wherein n is 0 with a proviso that Y is a vinyl group.
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13. A barrier composite film according to claim 1, wherein the proportion of the silane coupling agent is 0.05 to 10 parts by weight relative to 100 parts by weight of the gas barrier resin.
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14. A barrier composite film according to claim 1, wherein the proportion of the silane coupling agent is 0.1 to 7 parts by weight relative to 100 parts by weight of the gas barrier resin.
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15. A barrier composite film according to claim 1, wherein the thickness of the gas barrier resin coating layer is 0.05 to 15 μ
- m.
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16. A barrier composite film according to claim 1, wherein the ratio of the thickness T μ
- m of said gas barrier resin coating layer relative to the thickness t μ
m of said inorganic layer is T/t =0.1 to 1,500.
- m of said gas barrier resin coating layer relative to the thickness t μ
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17. A barrier composite film according to claim 1, wherein the ratio of the thickness T μ
- m of said gas barrier resin coating layer relative to the thickness t μ
m of said inorganic layer is T/t =0.5 to 500.
- m of said gas barrier resin coating layer relative to the thickness t μ
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18. A barrier composite film according to claim 1, wherein said film comprises a polypropylene, polyalkylene terephthalate or polyamide base film layer, an inorganic layer formed from a silicon oxide of the composition formula SiOx wherein x is defined by 0 <
- x ≦
2 and having a thickness of 100 to 5,000 Å and
a gas barried resin coating layer comprising a silane coupling agent and a copolymer of vinylidene chloride with other copolymerizable monomers or ethylene-vinyl alcohol copolymer, said inorganic layer and barrier resin coating layer being formed in the order mentioned on at least one surface of said base film layer and the ratio of the thickness T μ
m of said barrier resin coating layer relative to the thickness t μ
m of said inorganic layer being in the range of 1 to 200.
- x ≦
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19. A barrier composite film according to claim 1, wherein at least one surface of a polypropylene, polyalkylene terephthalate or polyamide base film layer is successively covered with an inorganic layer formed from an electrically nonconductive inorganic substance in a thickness of 200 to 3,000 Å
- , and a gas barrier resin coating layer formed in a thickness of 0.1 to 10 μ
m in that order.
- , and a gas barrier resin coating layer formed in a thickness of 0.1 to 10 μ
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20. A barrier composite film according to claim 1, wherein the peeling strength of the coating layer relative to the base film layer after storage at a temperature of 40°
- C. and relative humidity of 90% for 1 week is not less than 100 g/15 mm.
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21. A barrier composite film according to claim 1, wherein the composite film shows an oxygen gas permeability of not greater than 5 cc/M2 19 24 hr. at 25°
- C., and a water vapor permeability of not greater than 5 g/m2 ·
24 hr. at 40°
C. and relative humidity of 90% as determined with a base film layer thickness of 10 to 30 μ
m and a thickness of a covering layer comprising the inorganic layer and the coating layer of 0.5 to 5 μ
m.
- C., and a water vapor permeability of not greater than 5 g/m2 ·
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22. A barrier composite film according to claim 1, wherein the other side of said base film or the surface of said gas barrier resin coating layer is covered with a heat-sealing layer.
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23. A process for producing a barrier composite film which comprises depositing an inorganic thin layer having a thickness of 100 to 5,000 Å
- on at least one side of a base film and coating the deposited side of said base film with a coating composition containing a silane coupling agent and a gas barrier resin.
- View Dependent Claims (24)
Specification