To provide a urethane resin adhesive composition that is cured in a short time by heating, has high strength and high expansion, and has superior adhesion properties.
The urethane resin adhesive composition comprises: a urethane resin comprising two or more polyfunctional polyols and one or more polyfunctional isocyanate; 2-methyl 1,4-diazabicyclo[2,2,2] octane; and one of 1,5-diazabicyclo [4,3,0] non-5-ene or its salt, and 1,8-diazabicyclo [5,4,0] undec-7-ene. The polyfunctional polyol has a first polyfunctional polyol having a number-average molecular weight of 50 to 800 and a second polyfunctional polyol having a number-average molecular weight of 1,000 to 4,000, wherein the first and second polyfunctional polyols have an average OH value of 150 to 800. The content of the first polyfunctional polyol is 5 to 50 mass% based on the total of all the polyfunctional polyols. The polyfunctional isocyanate has an NCO/OH ratio of 0.8 to 1.2.
ARAKI KIMINORI
YOSHIKAWA ATSUSHI
NITTA MASAKI
TOYOTA MOTOR CORP