| 摘要 |
PURPOSE:To obtain the title low-smoking composition excellent in storage stability and adhesiveness, by mixing a specified thermosetting phenolic resin with an epoxy resin and an organic solvent. CONSTITUTION:A phenol is brought into contact with an HCl-HCHO bath having an HCl concentration of 5-28wt.%, an HCHO concentration of 8-25wt.% and a total concentration of HCl and HCHO of 15-40wt.% and kept at a bath ratio >=8 according to the equation to obtain a thermosetting phenolic resin (A) of a weight-average MW (in terms of PS) >=1,000 by GPC and a free phenol content (as measured by liquid chromatography) <=500ppm. Component A is mixed with an epoxy resin (B) and an organic solvent (C) (e.g., methanol) at an A to B weight ratio of 50/50-95/5 and an (A+B) to C weight ratio of 5/95-80/20. |
