ROSIN-MODIFIED PHENOL RESIN, PROCESS FOR PRODUCTION THEREOF, VARNISH FOR PRINTING INK, AND PRINTING INK

摘要

A rosin-modified phenolic resin, which consists of a reaction product among (a) a rosin that contains a component derived from communic acid in an amount of 0.1 to 0.8wt%, (b) a condensation product of a phenol and formaldehyde, and (c) a polyol. The rosin-modified phenol resin makes it possible to produce a printing ink which has a good balance among ink performances such as fluidity, emulsification resistance, misting resistance, drying properties, and gloss.