Formaldehyde → Naphthalene

Participants

Reaction Steps

100 Parts of a naphthaleneformaldehyde resin and 100 parts of phenol were reacted with each other in the presence of 0.1 part of p-toluenesulfonic acid as a catalyst at 140° C. for 2 hours. Then, 1 part of oxalic acid and 35 parts of 37% formalin were added, and the mixture was allowed to react at 100° C. for 2.5 hours. Thereafter, while the mixture was heated, it was subjected to dehydration treatment under reduced pressure. When the temperature reached 165° C., the dehydration under reduced pressure was terminated to give a brown opaque naphthalene.formaldehyde resin-modified novolak.phenolic resin having a softening point of 125° C. In this case, the amount of phenol in the distillate was about 4% based on the charged phenol amount.

Provenance & Evidence