| abstract |
Disclosed is a primer composition comprising (A) a polyfunctional urethane-urea resin that is obtained by reacting (A1) an organic polyisocyanate, (A2) a polymer polyol, and (A3) a chain extender made of a hydroxyl group-containing diamine, and that has hydroxyl groups derived from the aforementioned chain extender on molecule side chains, 5‑20 functional groups and a number average molecular weight of 10,000‑50,000, and (B) an organic solvent. The primer composition exhibits sufficient adhesion to an adherend made of a plastic, such as nylon, and a coating film with excellent solvent resistance can be formed even when the curing time is short. |