| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a thermoplastic resin-modified novolak-type phenolic resin in a high yield, which scarcely contains unreacted phenols and has a high melting point and high fluidity by making a molecular- weight distribution of the novolak-type phenolic resin narrow. SOLUTION: This method for producing the thermoplastic resin-modified novolak-type phenolic resin comprises adding a thermoplastic resin to a mixture of a phenol and an aldehyde prior to the polymerization thereof, and prior, during or after the polymerization, an organic phosphonic acid is added to obtain the novolak-type phenolic resin. mixing or reacting The thermoplastic resin is mixed and reacted with the saw materials or with the novolak-type phenolic resin in a molten or solution state.
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