| 主权项 |
1. A method of preparing a dentifrice comprising a polymer matrix film with a low solubility flavorant therein comprising the steps of:
a) forming a polymer matrix film in the substantial absence of a low solubility flavorant; wherein said polymer matrix comprises a water soluble polymer and a low solubility polymer additive; b) forming a dentifrice base comprising a low solubility flavorant; c) combining the polymer matrix film with the dentifrice base; and d) maintaining the combined polymer matrix film and dentifrice base for an amount of time suitable for an effective amount of said low solubility flavorant to transfer from said dentifrice base to said polymer matrix film; wherein the low solubility flavorant is selected from the group consisting of: menthol, spearmint oil, cinnamon oil, peppermint oil, clove oil, bay oil, thyme oil, cedar leaf oil, oil of nutmeg, oil of sage, and oil of bitter almonds, said water soluble polymer comprises hydroxypropyl methyl cellulose and the low solubility polymer additive is ethyl cellulose; andthe combined water soluble polymer and low solubility polymer additive makes up by weight between 40-90% of polymer film matrix and the ratio of water soluble polymer to low solubility polymer additive by weight is between 5:2 and 4:3:wherein the polymer matrix film is formed in the substantial absence of alcohol. |
