| abstract |
The present invention provides a urethane resin adhesive composition that solidifies in a short time by heating, has high strength and high elongation, and is excellent in adhesiveness. A urethane resin containing two or more polyfunctional polyols and one or more polyfunctional isocyanates, 2-methyl-1,4-diazabicyclo [2,2,2] octane, and 1,5-diazabicyclo. [4,3,0] nonene-5 or a salt thereof and 1,8-diazabicyclo [5,4,0] undecene-7 or a salt thereof, and the polyfunctional polyol includes: A first polyfunctional polyol having a number average molecular weight of 50 or more and 800 or less and a second polyfunctional polyol having a number average molecular weight of 1,000 or more and 4000 or less, wherein the first polyfunctional polyol and the second polyfunctional polyol are: The average OH value is 150 or more and 800 or less, and the content of the first polyfunctional polyol is 5% by mass or more and 50% by mass or less with respect to the sum of all polyfunctional polyols. The functional isocyanate is a urethane resin adhesive composition having an NCO / OH ratio of 0.8 or more and 1.2 or less. [Selection figure] None |