| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a resol resin, which is a method for producing a resol resin substantially not containing unreacted monomers or containing an extremely small amount of unreacted monomers and with which environmental loading is reduced and physical properties of excellent curability and heat resistance can be obtained while keeping water solubility. SOLUTION: This method for producing a water-soluble resol resin comprises reacting an aldehyde with phenol in the ratio of [aldehyde]/[phenol] of 0.3-0.6 (molar ratio) to give a novolak resin (A) and reacting the novolak resin (A) with an aldehyde.
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