PURPOSE: To provide an ink having excellent storage stability for long periods and giving printed products having improved abrasion resistance by compounding carbon black, an alcohol, water, etc., with two kinds of water-soluble resins having specific glass transition temperatures and comprising the resins in a specific ratio.
CONSTITUTION: The objective ink contains (A) water-soluble resins comprising a 95:5-50:50 weight ratio mixture of (i) the first water-soluble resin and (ii) the second water-soluble resin, the first resin i being prepared from styrene (derivative) and/or (meth)acrylic acid or maleic acid (derivative) as monomers and having a glass transition temperature of ≥50°C, and the resin ii being prepared from an acrylic ester and (meth)acrylic acid and/or maleic acid (derivative) and having a glass transition temperature of ≤50°C, (B) carbon black, (C) a polyhydric alcohol and/or an alkyl ether thereof, (D) an aliphatic monohydric alcohol, water, etc.
SUGA YUKO
NOGUCHI HIROMICHI
