| abstract |
The present invention provides a phenol novolak resin, a composition, a method for producing the same, and a cured product thereof, which are excellent in the balance of the molding shrinkage rate and the elastic modulus at the time of heat when the composition containing the phenol novolac resin is heat-cured. The present invention is a phenol novolak resin, a curable resin composition using the same, and a hardened product thereof. The phenol novolak resin is characterized in that it has an alkyl group having 4 to 8 carbon atoms as a substituent on an aromatic ring Alkylphenol (I) is an alkylphenol novolak resin formed by methylene linkage, and the integrated value of 146 to 148 ppm (a) and the integrated value of 146 to 153 ppm (b) in 13 C-NMR measurement The ratio (a) / (b) is in the range of 0.05 to 0.30, and the area ratio of the alkylphenol (I) in the GPC measurement is in the range of 0.01 to 3.0%. |