Composite foil
AssigneeRB Kunststoffpatent-Verwertungs AG
InventorRoland K. Belz
Life of this patent
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Abstract
A composite foil having at least two layers in which the first layer is normally water soluble and the second layer contains a dissolving intermediary for the first layer for use as packing material.
Claims24
A composite foil comprising:
- at least one first layer, said first layer being insoluble in pH neutral water, non-porous and being an extruded thermoplastic material;
- at least one second layer connected to said first layer, said second layer containing an solubilizer capable of dissolving said first layer when said second layer is wetted;
- and,
- said connected first and second layers being self-supporting.
A package comprised of a plurality of layers, at least a first of said layers being an extruded thermoplastic material insoluble in pH neutral water, at least one other of said layers being in contact with said first layer and having a solubilizing agent capable of dissolving said extruded thermoplastic material, said layers being together readily decomposable in moist medium.
A composite sheet material formed from at least two layers in which at least one normally water-insoluble sealing first layer is connected to at least one water soluble second layer, said second layer containing a solubilizer for said first layer, wherein said first layer comprises a non-porous layer formed by extrusion of thermoplastic material which is soluble in a non-neutral medium, and said second layer comprises a layer formed of a material which is (I) water soluble or (II) water-insoluble and soluble in a non-neutral medium, said solubilizer in said second layer being present in an amount sufficient for solubilizing said first layer and said second layer when the latter is also formed by extrusion of a water-insoluble material and wherein at least one of said first and second layers is self-supporting.
Dependencies are inferred from the claim text.