| 摘要 |
PROBLEM TO BE SOLVED: To obtain an adhesive capable of simply uniformizing an adhesive layer and improving its working property in a working spot, and also having a good preservation property by containing a specific blocked urethane prepolymer as a main component. SOLUTION: This adhesive contains a blocked polyurethane prepolymer as a main component, which is obtained by reacting (A) a linear urethane prepolymer having isocyanate group with (B) an aliphatic monohydric alcohol having 200-560 hydroxyl group value and (C) a blocking agent as a compound other than the component A. Further, it is preferable to obtain the above prepolymer by reacting the component A with (D) a low molecular weight diol having >400 hydroxyl group value, and then with the components B and C, and that the component A is obtained by reacting an organic diisocyanate, a high molecular weight diol having 40-400 hydroxyl group value and a low molecular weight diol having >400 hydroxyl group value in a ratio that the isocyanate groups become excessive when basing on the hydroxyl groups. |
