| abstract |
[PROBLEMS] To provide a drug for use in the preservative treatment of wood which has extremely low toxicity, excellent preservative property, low volatilization and elution, and good workability, its use method and production method. SOLUTION: A drug mainly composed of polyphenols having a number average molecular weight of 100 to 800 and a softening point of 30 to 100 ° C., such as lignin obtained by extracting from bagasse, cedar or the like with water-butanol or the like. , Its usage and manufacturing method. 【Selection chart】 None |