VARNISH FOR FLEXOGRAPHIC PRINTING INK, ITS PRODUCTION, AND FLEXOGRAPHIC PRINTING INK COMPOSITION CONTAINING SAID VARNISH

摘要

PURPOSE: To provide the title varnish which can provide an ink composition having good water allowance and excellent printability and being capable of performing simultaneously speed-up and grade-up of printing by reacting the polar groups of a specified binder resin with amino groups. ;CONSTITUTION: A process for producing a varnish for a lithographic printing ink mainly consisting of a binder resin containing at least one member selected from among a phenolic resin, an alkyd resin and a rosin ester resin, a vegetable oil and a high-boiling petroleum solvent, wherein the polar groups of the binder resin are crosslinked by using an amino resin at a temperature equal to or lower than the softening point of the binder resin. An ink composition containing this varnish has good water allowance and excellent printability. Further, it can retain gloss as an index of printing quality, can be markedly improved in settability and driability, and can afford simultaneously speed-up and grade-up of printing.;COPYRIGHT: (C)1993,JPO&Japio