| 摘要 |
PROBLEM TO BE SOLVED: To provide a moisture-curable urethane-based hot melt adhesive which has a sufficient long adherable time after thermally melted and coated, has excellent workability, and expresses excellent strength, heat resistance, elasticity or the like, after cured with moisture. SOLUTION: This moisture-curable urethane-based hot melt adhesive contains, as a main component, a urethane prepolymer which is solid at the ordinary temperature, has isocyanate groups at both the molecular terminals, and is obtained by reacting a polyisocyanate compound with a hydroxyl group- containing composition comprising 30 to 90 wt.% of a polyester resin having hydroxyl groups at both the molecular terminals and 10 to 70 wt.% of a polyalkylene glycol that has hydroxyl groups at both the molecular terminals and at least one 2, 2'-bisphenylpropane skeleton in the main molecular chain. The moisture-curable urethane-based hot melt adhesive is characterized in that the softening pint (ring and ball method) measured according to JIS K-2207 is <=60 deg.C before cured with moisture.
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