| 摘要 |
PURPOSE:To obtain a high-solid and heat-resistant resin composition excellent in flexibility, by mixing a polyamide-imide resin obtained by reacting a tribasic acid anhydride with an aromatic diisocyanate with a nonbranched saturated polyester resin. CONSTITUTION:A resin composition containing 100pts.wt. polyamide-imide resin and 0.1-5pts.wt. nonbranched saturated polyester resin. Said polyamide-imide resin is a resin obtained by reacting a tribasic acid anhydride with an aromatic diisocyanate and, optionally, a tetrabasic acid dianhydride at a tribasic acid anhydride to aromatic diisocyanate molar ratio of 0.90-1.10 in a polar solvent so that the reduced viscosity (as measured in dimethylformamide in a solid content of 0.5g/dl) may be 0.20-0.35. Trimellitic anhydride is preferable as the tribasic acid anhydride from the viewpoint of heat resistance. 4,4'- Diphenylmethane diisocyanate is desirable as the aromatic diisocyanate from the viewpoint of flexibility. |
