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A transparent polyurethane-hydrogel composition includes a reaction product in aqueous solvent of a prepolymer and a water-soluble crosslinker in the substantial absence of organic solvent, and such a composition can be prepared by admixing a prepolymer and a water-soluble crosslinker in aqueous sol

A transparent polyurethane-hydrogel composition includes a reaction product in aqueous solvent of a prepolymer and a water-soluble crosslinker in the substantial absence of organic solvent, and such a composition can be prepared by admixing a prepolymer and a water-soluble crosslinker in aqueous solvent and in the substantial absence of organic solvent. A prepolymer is present in an amount of no greater than about 5 weight percent based on total weight of all hydrogel components. The prepolymer is generally prepared from at least one water-soluble polyol and an isocyanate. A water-soluble crosslinker generally has a crosslinker functionality of at least 2 and is selected to provide a site ratio of initial isocyanate to crosslinker (i.e., moles NCO×functionality/moles crosslinker×functionality) of at least about 1.5 and no greater than about 2.6. In one embodiment, a crosslinker is effective to react with and solubilize residual isocyanate concurrently with the reaction between prepolymer and crosslinker. A transparent polyurethane-hydrogel composition has desirable gel physical properties and is useful for an air-freshener application.

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1. A polyurethane-hydrogel composition, said composition being prepared by a method comprising:admixing at least one prepolymer and at least one water-soluble crosslinker in aqueous solvent and in the substantial absence of organic solvent to form a polyurethane-hydrogel mixture, said prepolymer bei

1. A polyurethane-hydrogel composition, said composition being prepared by a method comprising:admixing at least one prepolymer and at least one water-soluble crosslinker in aqueous solvent and in the substantial absence of organic solvent to form a polyurethane-hydrogel mixture, said prepolymer being prepared from at least one water-soluble polyol and at least one isocyanate and being present in an amount of no greater than about 5 weight percent, said weight percent being based on total weight of all components; and (b) polymerizing said mixture to form a composition, wherein said composition is substantially polymerized, is transparent, has an effective number-average molecular weight between crosslinks and the crosslinker comprises an amine end-capped poly(ethylene oxide), or at least one of a 3-arm amine end-capped polyethyleneglycol or polyoxyethylene bis(amine). 2. A composition according to claim 1, wherein said crosslinker comprises an amine end-capped poly(ethylene oxide) crosslinker.3. A composition according to claim 1, wherein said crosslinker comprises at least one of a 3-arm amine end-capped polyethyleneglycol and polyoxyethylene bis(amine).4. A composition according to claim 1, wherein said water-soluble crosslinker comprises a polyamine, said polyamine having a charge density of at least 0.8 meq charge per gram of crosslinker.5. A composition according to claim 1 , wherein said crosslinker has a functionality effective to provide a reaction rate with said prepolymer that is at least 10 times faster than the reaction rate of water with said prepolymer.6. A composition according to claim 1, wherein said prepolymar is prepared from an aliphatic or cycloaliphatic isocyanate.7. A composition according to claim 6, wherein said isocyanate comprises isophorone diisocyanate.8. A composition according to claim 1, wherein said prepolymer is prepared from a polyoxyalkylene polyol.9. A composition according to claim 8, wherein said polyol comprises a 7,000 molecular-weight triol copolymer of 75% ethylene oxide and 25% propylene oxide.10. A composition according to claim 1, wherein said prepolymer is prepared from an isocyanate comprising isophorone diisocyanate and a polyol comprising a 7,000 molecular-weight triol copolymer of 75% ethylene oxide and 25% propylene oxide.11. A composition according to claim 1, wherein said mixture is formed by further admixing a fragrance composition with said at least one prepolymer and said at least one water-soluble crosslinker.12. A composition according to claim 11, wherein said fragrance composition comprises a fragrance oil and a surfactant.13. A composition according to claim 12, wherein said surfactant comprises at least one of ethoxylated alkyl phenol, nonylphenol, and ethoxylated alcohol.14. A composition according to claim 1, wherein said mixture is formed by admixing at least one additive with said at least one prepolymer and said at least one water-soluble crosslinker.15. An air-freshener composition, said composition being prepared by a method comprising:admixing at least one prepolymer, at least one water-soluble crosslinker, and at least one fragrance composition in aqueous solvent and in the substantial absence of organic solvent to form a polyurethane-hydrogel mixture, said prapolymer being prepared from at least one water-soluble polyol and at least one isocyanate and being present in an amount of no greater than about 5 weight percent, said weight percent being based on total weight of all components; (b) polymerizing said mixture to form a composition, wherein said composition is substantially polymerized, is transparent, and has an effective number-average molecular weight between crosslinks. 16. A composition according to claim 15, wherein said crosslinker comprises polyethylenimine.17. A composition according to claim 15, wherein said crosslinker comprises an amine end-capped poly(ethylene oxide) crosslinker.18. A composition according to claim 15, wherein said crosslinker comprise at least one of a 3-arm amine end-capped polyethyleneglycol and polyoxyethylene bis(amine).19. A composition according to claim 15, wherein said water-soluble crosslinker comprises a polyamine, said polyamine having a charge density of at least 0.8 meq charge per gram of crosslinker.20. A composition according to claim 15, wherein said prepolymer is prepared from an aliphatic or cycloaliphatic isocyanate.21. A composition according to claim 20, wherein said isocyanate comprises isophorone diisocyanate.22. A composition according to claim 15, wherein said prepolymer is prepared from a polyoxyalkylene polyol.23. A composition according to claim 22, wherein said polyol comprises a 7,000 molecular-weight triol copolymer of 75% ethylene oxide and 25% propylene oxide.24. A composition according to claim 15, wherein said prepolymer is prepared from an isocyanate comprising isophorone diisocyanate and a polyol comprising a 7,000 molecular-weight triol copolymer of 75% ethylene oxide and 25% propylene oxide.25. A composition according to claim 15, wherein said fragrance composition comprises a fragrance oil.26. A composition according to claim 24, wherein said fragrance composition further comprises at least one of a surfactant and an antifreeze.27. A composition according to claim 26, wherein said surfactant comprises at least one of ethoxylated alkyl phenol, nonylphenol, and ethoxylated alcohol.28. A composition according to claim 15, wherein said mixture is formed by admixing at least one additive with said at least one prepolymer and said at least one water-soluble crosslinker.29. An air freshener, said air freshener comprising(a) a container; and a polyurethane-hydrogel composition dispensed into said container, said composition being prepared by a method comprising: admixing at least one prepolymer, at least one water-soluble crosslinker, and at least one fragrance composition in aqueous solvent and in the substantial absence of organic solvent to form a polyurethane-hydrogel mixture, said prepolymer being prepared from at least one water-soluble polyol and at least one isocyanate and being present in an amount of no greater than about 5 weight percent, said weight percent being based on total weight of all components; and (ii) polymerizing said mixture in said container to form an air freshener, wherein said air freshener is substantially polymerized, is transparent, and has an effective number-average molecular weight between crosslinks. 30. An air freshener according to claim 29, wherein said crosslinker comprises polyethylenimine.31. An air freshener according to claim 29, wherein said crosslinker comprises an amine end-capped poly(ethylene oxide) crosslinker.32. An air freshener according to claim 29, wherein said crosslinker comprises at least one of a 3-arm amine end-capped polyethyleneglycol and polyoxyethylene bis(amine).33. An air freshener according to claim 29, wherein said water-soluble crosslinker comprises a polyamine, said polyamine having a charge density of at least 0.8 meq charge per gram of crosslinker.34. An air freshener according to claim 29, wherein said prepolymer is prepared from an aliphatic or cycloaliphatic isocyanate.35. An air freshener according to claim 34, wherein said isocyanate comprises isophorone diisocyanate.36. An air freshener according to claim 29, wherein said prepolymer is prepared from a polyoxyalkylene polyol.37. An air freshener according to claim 36, wherein said polyol comprises a 7,000 molecular-weight triol copolymer of 75% ethylene oxide and 25% propylene oxide.38. An air freshener according to claim 29, wherein said prepolymer is prepared from an isocyanate comprising isophorone diisocyanate and a polyol comprising a 7,000 molecular-weight triol copolymer of 75% ethylene oxide and 25% propylene oxide.39. An air freshener according to claim 29, wherein said fragrance composition comprises a fragrance oil.40. An air freshener according to claim 39, wherein said fragrance composition further comprises at least one of a surfactant and an antifreeze.41. An air freshener according to claim 29, wherein said composition further comprises a gel object suspended within said composition.42. An air freshener according to claim 29, wherein said mixture is formed by further admixing a colorant with said prepolymer and said water-soluble crosslinker.43. A method for preparing a transparent polyurethane-hydrogel composition, said method comprising:admixing at least one prepolymer and at least one water-soluble crosslinker in aqueuos solvent and in the substantial absence of organic solvent to form a polyurethane-hydrogel mixture, said prepolymer comprising at least one water-soluble polyol and at least one isocyanate and being present in an amount of no greater than about 5 weight percent, said weight percent being based on total weight of all components; wherein the crosslinker comprises an amine end-capped poly(ethylene oxide), or at least one of a 3-arm amine end-capped polyethyleneglycol or polyoxyethylene bis(amine) and (b) polymnerizing said mixture to form a composition, wherein said composition is substantially polymerized, is transparent, and has an effective number-average molecular weight between crosslinks. 44. A method according to claim 43, wherein said crosslinker comprises an amine end-capped poly(ethylene oxide) crosslinker.45. A method according to claim 43, wherein said crosslinker comprises at least one of a 3-arm amine end-capped polyethyleneglycol and polyoxyethylene bis(amine).46. A method according to claim 43, wherein said water-soluble crosslinker comprises a polyamine, said polyamine having a charge density of at least 0.8 meq charge per gram of crosslinker.47. A method according to claim 43, wherein said prepolymer is prepared from an aliphatic or cycloaliphatic isocyanate.48. A method according to claim 47, wherein said isocyanate comprises isophorone diisocyanate.49. A method according to claim 43, wherein said prepolymer is prepared from a polyoxyalkylene polyol.50. A method according to claim 49, wherein said polyol comprises a 7,000 molecular-weight triol copolymer of 75% ethylene oxide and 25% propylene oxide.51. A method according to claim 43, wherein said prepolymer is prepared from an isocyanate comprising isophorone diisocyanate and a polyol comprising a 7,000 molecular-weight triol copolymer of 75% ethylene oxide and 25% propylene oxide.