| 摘要 |
PURPOSE:To obtain a novel compound having a definite molecular weight and extremely effective in preventing the deposition of scale during polymerization reaction, by reacting an aromatic aldehyde with pyrogallol or hydroxyhydroquinone or other phenolic compound containing the same. CONSTITUTION:A novel condensation compound containing phenolic residues and reaction residues of aromatic aldehyde as repeating units and having a molecular weight of 308-2,000 can be produced by reacting an aromatic aldehyde (e.g. benzaldehyde) with pyrogallol, hydroxyhydroquinone or other phenolic compound containing the same (e.g. phenol, cresole, catechol, etc., preferably amounting to <=50mol%). The formation of polymer scale can be prevented by applying the above compound to the inner surface of a polymerizer prior to the polymerization of especially vinyl chloride.
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