| 摘要 |
PURPOSE:A plaster having improved expanding and contracting properties, drug releas ing effect, durability of medicinal effect, etc., obtained by forming a drug retaining layer consisting of a high-viscosity gelatinous base on one side (inner part layer) of elastic urethane foam, and laminating a pressure-sensitive adhesive layer in contact with the layer on it. CONSTITUTION:The drug retaining layer 2 consisting of a high-viscosity gelatinous base containing a drug such as methyl salicylate, etc. is formed on the inner part layer of one side of the substrate 1 comprising the elastic open-cell foamed urethane foam by a means such as packing, impregnation, etc. Further, the water-soluble or water-insoluble pressure-sensitive adhesive layer 3 is laminated to the layer in such a way that the drug retaining layer 2 is laminated to the layer in such a way that the adhesive layer is directly brought into contact with the drug retaining layer 2, to give an elastic plaster capable of keeping common adherent feeling by expansion and contraction of the substrate 1 even if this plaster is applied to the expanding and contracting part of the skin, having and improved drug releasing effect and durability of medicinal effect because of double layer structure of the drug retaining layer 2 and the pressure-sensitive adhesive layer 3. Before the plaster is used, the pressure- sensitive adhesive layer 3 is protected with the release layer 4.
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