New Synthetic Varnishes from Local Coal-Tar Phenols

Locally producer coal-tar phenols were fractionally distilled and the required fraction which rich with phenol was collected and specified. This phenolic fraction was methylated and acylated with selected acid chlorides to the corresponding ketones which then reduced and finally demethylated to the required alkyl phenols. These alkyl phenols were condensed with formalin to produce the corresponding alkyl phenol-formaldehyde resin which the processed to the required varnishes. Several formulations from the prepared varnish samples were chosen and their electrical and chemical properties were examined.