MANUFACTURING METHOD OF ROSIN-MODIFIED PHENOL RESIN FOR OFFSET PRINTING INK, ROSIN-MODIFIED PHENOL RESIN FOR OFFSET PRINTING INK, VARNISH FOR OFFSET PRINTING INK, AND OFFSET PRINTING INK

摘要

To provide a manufacturing method capable of providing a rosin-modified phenol resin for offset printing ink, having excellent dryness property, misting resistance, glossiness and emulsification resistance while maintaining solubility to an aliphatic hydrocarbon solution, the rosin-modified phenol resin for offset printing ink, a varnish for offset printing ink containing the rosin-modified phenol resin, and an offset printing ink containing the varnish for offset printing ink.SOLUTION: A manufacturing method of a rosin-modified phenol resin for offset printing ink by reacting a rosins (A), formaldehyde (B), phenol and/or p-alkyl phenol (C), and polyol (D) in the presence of an alkali earth metal catalyst (E), with use ratio (molar ratio) of the (B) component and (C) component, [(B)/(C)] of 4 to 10, is used.SELECTED DRAWING: None