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In a four-necked flask equipped with a reflux condenser and a thermometer were placed 110 g (1.0 mole) of resorcin and 44.5 g (0.55 mole) of 37% formalin, and the resulting mixture was subjected to reaction at 70° C. for five hours. The reflux condenser was then replaced by a fractionator, and the pressure in the flask was reduced to 25 mmHg, after which the temperature was elevated to 150° C., at which temperature the contents of the flask were concentrated for three hours to obtain a resorcin formaldehyde resin [T].

1. customIn a four-necked flask equipped with a reflux condenser
2. customthe resulting mixture was subjected to reaction at 70° C. for five hours
3. customwas elevated to 150° C., at which temperature
4. concentrationwere concentrated for three hours