| 摘要 |
<p>A primer composition which contains a urethane-urea resin obtained by reacting (A) an organic polyisocyanate with (B) a polymer polyol and (C) a chain extender consisting of a low -molecular diamine, wherein the urethane-urea resin exhibits a yield stress of 5.0MPa or above in the tensile test stipulated in JIS K6301 at a pulling rate of 200mm/min, and a tan d value of 0.05 to 0.10 at 20°C in the dynamic viscoelasticity test stipulated in JIS K7244 at a temperature rise rate of 2°C/min, and has a number-average molecular weight of 10,000 to 30,000. The primer composition exhibits sufficient adhesiveness to adherends of plastics such as nylon, and can form a coating film with excellent solvent resistance even when the curing time is short.</p> |
