Disposable, moisture vapour permeable, liquid impermeable covering sheet containing active agents

Abstract

The present invention relates to a disposable covering sheet which is moisture vapour permeable and liquid impermeable and contains active agent or agents. The disposable covering sheet comprises at least a moisture vapour permeable layer and a liquid impermeable but moisture vapour permeable film layer of thermoplastic compositions. The disposable covering sheet such as, for example, a mattress cover or a pillow cover gives a better comfort to the user by providing active agent releasing properties. The disposable covering sheet of the present invention can find a variety of applications wherein moisture vapour permeability and liquid imperviousness combined with long lasting active agent releasing properties are desirable.

What is claimed is:  
     
         1 . A disposable, moisture vapour permeable, liquid impermeable, covering sheet comprising at least a moisture vapour permeable layer and a liquid impermeable but moisture vapour permeable film layer of thermoplastic composition applied onto said moisture vapour permeable layer characterised in that said covering sheet comprises an active agent releasing system which is able to provide an active agent odour intensity positive difference of at least 5 after 7 days, compared to the active agent odour intensity of the active agent itself after the same period of time, said value determined according to the Active Agent Intensity Test described herein, in order to provide a prolonged release of said active agent after the initial use of said covering sheet.  
     
     
         2 . A disposable, moisture vapour permeable, liquid impermeable, covering sheet according to  claim 1 , characterized in that said active agent releasing system is able to provide an active agent odour intensity positive difference of at least 10.  
     
     
         3 . A disposable, moisture vapour permeable, liquid impermeable, covering sheet according to  claim 1 , characterized in that said active agent releasing system is able to provide an active agent odour intensity positive difference of at least 15.  
     
     
         4 . A disposable, moisture vapour permeable, liquid impermeable, covering sheet according to  claim 1 , characterized in that said active agent releasing system is able to provide said active agent odour intensity positive difference after 14 days.  
     
     
         5 . A disposable, moisture vapour permeable, liquid impermeable, covering sheet according to  claim 2 , characterized in that said active agent releasing system is able to provide said active agent odour intensity positive difference after 14 days.  
     
     
         6 . A disposable, moisture vapour permeable, liquid impermeable, covering sheet according to  claim 3 , characterized in that said active agent releasing system is able to provide said active agent odour intensity positive difference after 14 days.  
     
     
         7 . A disposable, moisture vapour permeable, liquid impermeable covering sheet according to  claim 1  wherein said active agent releasing system comprises a perfume as an active agent.  
     
     
         8 . A disposable, moisture vapour permeable, liquid impermeable covering sheet according to  claim 1  wherein said active agent releasing system is a product of reaction between an amino functional polymer comprising at least one primary and/or secondary amine group and an active component selected from ketone, aldehyde, and mixture thereof.  
     
     
         9 . A disposable, moisture vapour permeable, liquid impermeable covering sheet according to  claim 1  wherein said active agent releasing system is a starch encapsulated perfume.  
     
     
         10 . A disposable, moisture vapour permeable, liquid impermeable, covering sheet according to  claim 1  characterised in that its Water Vapour Transmission Rate (WVTR) is at least 400 g/m 2 ·24 h.  
     
     
         11 . A disposable, moisture vapour permeable, liquid impermeable, covering sheet according to  claim 10  characterised in that its Water Vapour Transmission Rate (WVTR) is at least 500 g/m 2 ·24 h.  
     
     
         12 . A disposable, moisture vapour permeable, liquid impermeable, covering sheet according to  claim 10  characterised in that its Water Vapour Transmission Rate (WVTR) is at least 600 g/m 2 ·24 h.  
     
     
         13 . A disposable, moisture vapour permeable, liquid impermeable, covering sheet according to  claim 1  wherein said covering sheet is a disposable covering sheet for bedding articles.  
     
     
         14 . A disposable covering sheet for bedding articles according to  claim 13  wherein said covering sheet is a disposable mattress cover or a disposable pillow cover.  
     
     
         15 . A disposable mattress cover according to  claim 14  characterised in that said mattress cover comprises adhesive means for fixing it to the longitudinal sides of a bed mattress.