| 摘要 |
PROBLEM TO BE SOLVED: To provide a self-curable resin made from plant-derived lignin, excellent in thermal resistance, high strength, flame resistance and antibacterial activity.SOLUTION: A self-curable resin is obtained by reacting a lignin soluble to an organic solvent with formaldehyde in the presence of alkali. It is preferable that a molar ratio of phenol to formaldehyde in the lignin is 1.0 to 3.0, a weight average molecular weight is 100 to 7,000, and a percentage content of a sulfur atom is 2 mass% or less. It is preferable that the lignin soluble to the organic solvent is obtained by processing method using only water to separate it from a cellulose component and a hemicellulose component, and dissolving it into the organic solvent. |
