Resin for a sizing composition, a process for its preparation and the sizing composition obtained

摘要

A condensation product of phenol, formaldehyde and urea condensed in the presence of a basic catalyst, said condensation product being a liquid and having a free phenol content below 0.5%, a free formaldehyde content below 3%, expressed by weight based on the total weight of liquid, and a dilutability, measured at 20 DEG C., of at least equal to 1000%.