Patent ID: 6433123
Filing Date: 2002-08-13
Classification: C08G,H05K,Y10T

Abstract:
A curable resin composition for overcoat of flexible circuit which comprises a hydrogenated polybutadiene polyol with a number-average molecular weight of 1,000-8,000 and having 2-10 hydroxyl groups per molecule (Polyol A), a hydrogenated polybutadiene blocked polyisocyanate with a number-average moleculer weight of 1,000-8,000 and having 2-10 blocked isocyanate groups per molecule (Isocyanate Xa), and a hydrogenated polybutadiene polyol with a number-average molecular weight of 13,000-30,000 and having 2-10 hydroxyl groups per molecule (Polyol B), wherein the weight ratio (as solid content) of said two polyols is (Polyol A):(Polyol B)=40:60-90:10, and said blocked polyisocyanate (Isocyanate Xa) is present in an amount of 0.8-3.5 gram equivalents based on, i.e., per one gram equivalent of, the total hydroxyl groups of the two polyols (Polyol A plus Polyol B).