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Multilayer preparation in film form, consisting of hydrophilic polymers, for the rapid release of active ingredients

  • US 7,332,230 B1
  • Filed: 11/03/2000
  • Issued: 02/19/2008
  • Est. Priority Date: 11/11/1999
  • Status: Expired due to Term
First Claim
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1. A multilayer preparation in the form of films of hydrophilic polymers for rapid release of substances present in the film layers into liquid surroundings, consisting essentially of:

  • a composite formed from at least two film layers, adjacent film layers being different from one another in that in each case one of said layers is soluble in a nonaqueous solvent in which the respective adjacent layer is insoluble or only slightly soluble, and the layer soluble in a nonaqueous solvent is formed from polyvinylpyrrolidone or a mixture comprising polyvinylpyrrolidone, and the insoluble or only slightly soluble adjacent layer is formed from polyvinyl alcohol or a mixture comprising polyvinyl alcohol.

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