PARTIALLY ACYLATED LIGNIN, EPOXY RESIN COMPOSITION USING THE SAME, AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an epoxy resin composition including lignin as a curing agent, which can be cured under mild conditions by enhancing solvent solubility of the used lignin while keeping reactivity of the lignin to the epoxy resin.

SOLUTION: This solvent-soluble lignin derivative is obtained by acylating only alcoholic hydroxy group among the alcoholic hydroxy group and a phenolic hydroxy group existing in the lignin molecule. The lignin derivative increases solvent-solubility because of selective acylation of alcoholic hydroxy groups, and can be used as raw materials to produce various useful resins by reacting with reactive components of the epoxy resin or the like under relatively mild conditions in a solvent because of the presence of free phenolic hydroxy groups. Further, it can be expected that the obtained resin improves heat resistance because the alcoholic hydroxy groups in lignin molecule in the produced resin are protected by ester groups.

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