| 摘要 |
PROBLEM TO BE SOLVED: To provide copper-clad laminated paper board excellent in heat resis tance and with less odor emission. SOLUTION: In synthesizing a drying oil-modified phenolic resin, a production method of the phenolic resin characterized by having 15-50% reaction ratio (a ratio of the amount of reacted phenol to the amount of charged phenol) of the drying oil and phenol, having 3,000-15,000 weight average molecular weight of the reaction product, and reacting formaldehyde in the presence of an alkali catalyst is employed. COPYRIGHT: (C)2003,JPO |
