Patent ID: 7338713

Claim:
A primer for coating a surface of an adherend before attaching an adhesive sheet to said adherend, the primer comprising as a main component thereof an oligomer and an organic solvent which dissolves said oligomer and is inert to an isocyanate group, said oligomer consisting essentially of a reaction product of (i) an isocyanurate compound which is a trimer of tolylene diisocyanate, said isocyanurate compound being represented by formula (I): and (ii) a polyol, wherein said polyol is selected from the group consisting of (a) a diol selected from the group consisting of ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, polyethylene glycol, polypropylene glycol and polytetramethylene glycol; and (b) a polyhydric alcohol having three or more hydroxyl groups, the polyhydric alcohol being selected from the group consisting of glycerol, trimethylolpropane, trimethylolethane, pentaerythritol and dimers thereof, and wherein said reaction product has isocyanate groups and has a number-average molecular weight in a range of 700 to 50,000, and wherein an average number of the isocyanate groups in one molecule of said reaction product is 2 to 100.