Rosin-modified phenol resin, process for production thereof, varnish for printing ink, and printing ink

摘要

A rosin-modified phenol resin which consists of a product of reaction among (a) a rosin that contains a component derived from communic acid in an amount of 0.1 to 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 balace among ink performances such as fluidity, emulsification resistance, misting resistance, driability, and gloss.