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A multilayer packaging material comprising(a) at least one layer of a gas-permeable material, and(b) at least one layer of a gas-barrier coating comprising a polymeric polyol made by copolymerizing a multifunctional epoxide resin and water in the presence of an amount of acid effective for polymeriz

A multilayer packaging material comprising(a) at least one layer of a gas-permeable material, and(b) at least one layer of a gas-barrier coating comprising a polymeric polyol made by copolymerizing a multifunctional epoxide resin and water in the presence of an amount of acid effective for polymerizing the epoxide resin and the water, the amount of water being sufficient to avoid gelation, the polymeric polyol optionally reacted with a crosslinking agent for hydroxyl functionality, especially an amino resin.

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1. A method for making a multilayer packaging material which reduces transmission of oxygen comprising(a) providing a gas-permeable packaging material,(b) providing a gas-barrier coating comprising a polymeric polyol made by copolymerizing a multifunctional epoxide resin and water in the presence of

1. A method for making a multilayer packaging material which reduces transmission of oxygen comprising(a) providing a gas-permeable packaging material,(b) providing a gas-barrier coating comprising a polymeric polyol made by copolymerizing a multifunctional epoxide resin and water in the presence of an amount of acid effective for polymerizing the epoxide resin and the water, the amount of water being sufficient to avoid gelation, the polymeric polyol optionally reacted with a cross-linking agent for hydroxyl functionality, and(c) applying the gas barrier coating over the gas-permeable packaging material to form a multilayer packaging material. 2. The method of claim 1 in which the gas-barrier coating has an oxygen permeability constant (OPC) less than 2 Dow units. 3. The method of claim 1 in which the crosslinking agent is an amino resin. 4. The method of claim 1 in which the epoxide resin is the diglycidyl ether of bisphenol-A (BADGE), the diglycidyl ether of bisphenol-F (BFDGE), the diglycidyl ether of hydroquinone, or the diglycidyl ether of resorcinol (RDGE). 5. The method of claim 1 in which the epoxide resin is the diglycidyl ether of resorcinol (RDGE). 6. The method of claim 1 in which the acid is a superacid. 7. The method of claim 1 in which the acid is perchloric acid, trifluoromethanesulfonic acid, perfluoroalkylsulfonic acid, tetrafluoroboric acid, hexafluorophosphoric acid or boron trifluoride. 8. The method of claim 1 in which the gas-permeable material is a polyolefin, a poly(ethylene terephthalate), a poly(ethylene naphthalate) or a polycarbonate. 9. The method of claim 3 in which the amino resin crosslinking agent is a melamine-formaldehyde resin, a urea-formaldehyde resin, a benzoguanamine-formaldehyde resin, a glycouril-formaldehyde resin, or an etherified derivative thereof. 10. The method of claim 3 in which the amino resin crosslinking agent is a melamine-formaldehyde resin. 11. The method of claim 2 in which the epoxide resin is the diglycidyl ether of bisphenol-A (BADGE), the diglycidyl ether of bisphenol-F (BFDGE), the diglycidyl ether of hydroquinone, or the diglycidyl ether of resorcinol (RDGE), the gas-permeable material is a polyolefin, a poly(ethylene terephthalate), a poly(ethylene naphthalate) or a polycarbonate and the crosslinking agent is a melamine-formaldehyde resin, a urea-formaldehyde resin, a benzoguanamine-formaldehyde resin, a glycouril-formaldehyde resin, or an etherified derivative thereof. 12. A multilayer packaging material comprising(a) at least one layer of a gas-permeable polymeric material, and(b) at least one layer of a gas-barrier coating comprising a polymeric polyol made by copolymerizing a multifunctional epoxide resin and water in the presence of an amount of acid effective for polymerizing the epoxide resin and the water, the amount of water being sufficient to avoid gelation, the polymeric polyol optionally reacted with an amino resin crosslinking agent. 13. The multilayer packaging material of claim 12 in which the gas-barrier coating has an oxygen permeability constant (OPC) less than 2 Dow units. 14. The multilayer packaging material of claim 13 in which the epoxide resin is the diglycidyl ether of bisphenol-A (BADGE), the diglycidyl ether of bisphenol-F (BFDGE), the diglycidyl ether of hydroquinone, or the diglycidyl ether of resorcinol (RDGE). 15. The multilayer packaging material of claim 13 in which the epoxide resin is the diglycidyl ether of resorcinol (RDGE). 16. The multilayer packaging material of claim 14 in which the acid is a superacid. 17. The multilayer packaging material of claim 16 in which the acid is perchloric acid, trifluoromethanesulfonic acid, perfluoroalkylsulfonic acid, tetrafluoroboric acid, hexafluorophosphoric acid or boron trifluoride. 18. The multilayer packaging material of claim 17 in which the gas-permeable material is a polyolefin, a poly(ethylene terephthalate), a poly(ethylene naphthalate) or a polycarbonate. 19. The multilayer pa ckaging material of claim 18 in which the amino resin crosslinking agent is a melamine-formaldehyde resin, a urea-formaldehyde resin, a benzoguanamine-formaldehyde resin, a glycouril-formaldehyde resin, or an etherified derivative thereof. 20. The multilayer packaging material of claim 18 in which the amino resin crosslinking agent is a melamine-formaldehyde resin. 21. The multilayer packaging material of claim 16 in which the epoxide resin is the diglycidyl ether of resorcinol (RDGE), the gas-permeable material is a polyolefin, a poly(ethylene terephthalate), a poly(ethylene naphthalate) or a polycarbonate and the amino resin crosslinking agent is a melamine-formaldehyde resin. 22. A multilayer packaging material having at least one gas-permeable packaging material layer and at least one gas barrier material layer characterized in that the gas barrier material layer has an oxygen permeability constant (OPC) less than 2 Dow units and comprises the reaction product of(a) a polymeric polyol made by copolymerizing the diglycidyl ether of bisphenol-A, the diglycidyl ether of bisphenol-F, the diglycidyl ether of hydroquinone, the diglycidyl ether of resorcinol or a mixture thereof and water in the presence of an ether solvent and an amount of superacid effective for polymerizing the diglycidyl ether and the water, the amount of water being sufficient to avoid gelation and(b) an amino resin crosslinking agent which is a melamine-formaldehyde resin, a urea-formaldehyde resin, a benzoguanamine-formaldehyde resin, a glycouril-formaldehyde resin, or an etherified derivative thereof. 23. The multilayer packaging material of claim 22 in which the epoxide resin is the diglycidyl ether of resorcinol (RDGE). 24. The multilayer packaging material of claim 22 in which the superacid is perchloric acid, trifluoromethanesulfonic acid, perfluoroalkylsulfonic acid, tetrafluoroboric acid, hexafluorophosphoric acid or boron trifluoride. 25. The multilayer packaging material of claim 24 in which the gas-permeable material is a polyolefin, a poly(ethylene terephthalate), a poly(ethylene naphthalate) or a polycarbonate. 26. The multilayer packaging material of claim 24 in which the oxygen permeability constant (OPC) is less than 1 Dow units. 27. The multilayer packaging material of claim 26 in which the amino resin crosslinking agent is a melamine-formaldehyde resin. 28. A multilayer packaging material having at least one gas-permeable packaging material layer and at least one gas barrier material layer characterized in that the gas barrier material layer comprises the reaction product of(a) a polymeric polyol comprising glycol end groups and a repeat unit structure which contains two glycidyl units and primary and/or secondary alcohols and having a Mn of at least about 450 and(b) an amino resin crosslinking agent which is a melamine-formaldehyde resin, a urea-formaldehyde resin, a benzoguanamine-formaldehyde resin, a glycouril-formaldehyde resin, or an etherified derivative thereof. 29. The multilayer packaging material of claim 28 in which polymeric polyol comprises the following structurewhere R=hydrogen or either of the following radicals 1 or 2:where R′=R or H and where m, n, p, q, r, s, t, u and v range from 0 up to about 50, with the proviso that (m+n+p)≧1; the m, n and p, the q, r and s and the t, u and v units appearing in random order. 30. The multilayer packaging material of claim 29 in which polymeric polyol has the structurewhere R is H, and m, n and p range from 0 up to about 50, with the proviso that (m+n+p)≧1; the m, n and p units appearing in random order. 31. The multilayer packaging material of claim 29 in which polymeric polyol has the structurewhere X is an organic linking group from a diglycidyl ether, R is hydrogen or either of the following radicals 1 or 2:where R′=R or H and where m, n, p, q, r, s, t, u and v range from 0 up to about 50, with the proviso that (m+n+p≧1; the m, n and p, the q, r and s and the t, u and v units appearing in random order. 32. The multilayer packaging material of claim 31 in which X is selected from the group consisting of