| 摘要 |
PROBLEM TO BE SOLVED: To provide a formaldehyde-free or low-formaldehyde tannin-based adhesive composition having improved defect of tannin-based adhesive comprising the curing at a low pH region and provide a method for producing the composition. SOLUTION: The tannin-based adhesive composition is curable by a Lewis acid catalytic reaction and an oxidative condensation reaction. The agent to be used in the Lewis acid catalytic reaction catalyzes the reaction as an electron pair receptor. The production method comprises the addition of an agent having a Lewis acid catalyzing action and then an agent to perform the oxidative reaction to the tannin used as a base material of the adhesive or the addition of an agent to perform the oxidative reaction and then an agent having a Lewis acid catalyzing action to the tannin and the use of the tannin as the formaldehyde-free tannin adhesive. COPYRIGHT: (C)2004,JPO
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