| 摘要 |
A patch material which includes a backing material having a water-vapor permeability of 3,000 g/m2·day or more and an adhesive layer having a water-vapor permeability of 5,000 g/m2·day or more, wherein the adhesive layer comprises a polyurethane adhesive obtained by reacting (i) an active hydrogen compound having a number-average molecular weight of 5,000 or more and an average number of functional groups of 2 or more, and having a polyoxyalkylene structure, (ii) an active hydrogen compound having a number-average molecular weight of 1,500 to 5,000 and an average number of functional groups of 1, and having a polyoxyalkylene structure, and (iii) an organic polyisocyanate, wherein an average number of functional groups of all active hydrogen compounds used for obtaining the adhesive is 2 to 2.6, and the content of ethylene oxide units of all active hydrogen compounds in the adhesive is 3 to 8% by weight.
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