| 摘要 |
PROBLEM TO BE SOLVED: To provide a process for producing a glyoxal resin for use in processing a white fiber which is slightly colored. SOLUTION: The process (I) for producing a glyoxal resin comprises, in the presence of an aqueous medium, a step (a) of reacting urea or its derivative with glyoxal in a reaction vessel and subsequently a step (b) of reacting the reaction mixture with formaldehyde, wherein at least in the step (a), an oxidizing agent is permitted to be present and a compressed air or an oxygen gas is introduced into the liquid phase part or the gas phase part in the reaction vessel. Alternatively, a process (II) for producing a glyoxal resin comprises, in the presence of an aqueous medium and an oxidizing agent, reacting urea or its derivative with glyoxal and formaldehyde in a reaction vessel, wherein a compressed air or an oxygen gas is introduced into the phase part or the gas phase part in the reaction vessel. Additionally, the glyoxal resin produced by the process (I) or (II) is reacted with an aliphatic lower alcohol.
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