pH pH-SENSITIVE WATER-BASED INK COMPOSITION FOR GRAVURE PRINTING AND FLEXO PRINTING

摘要

The present invention relates to a pH-sensitive aqueous ink composition for gravure printing or flexographic printing, which comprises: an aqueous resin, a pH indicator, organic acid, a silane compound, a binder, a solvent and aqueous rubber, wherein the aqueous rubber includes Arabian rubber and tragacanth rubber. An ink of an aqueous type eliminates the use of organic solvents such as hydrocarbon-based, ketone-based, acetate-based, chlorine-based, and the like containing toluene, xylene, cyclohexanone, methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), etc and is able to detect pH changes while having suitable drying speed, viscosity and adhesion for gravure printing or flexographic printing.