| 摘要 |
<p>PURPOSE:To obtain the subject composition good in flow characteristics in producing the printing ink and stability thereof with time by adding an additive comprising a drying inhibitor, a pigment and a quaternary ammonium salt of a specific color acid to a vehicle for the offset ink. CONSTITUTION:This offset ink composition excellent in flowability in producing the printing ink and stability thereof with time is obtained by adding an additive comprising a drying inhibitor (e.g. dibutylhydroxytoluene), a pigment (e.g. a phthalocyanine-based pigment) and a quaternary ammonium salt of a color acid expressed by the formula (P is an organic coloring matter residue such as an azo-, a phthalocyanine-, a quinacridone-, an anthraquinone- or a dioxazine- based one; X is sulfonic acid or carboxylic acid; R<1> is an 8-20C alkyl; R2 to R4 each is a 1-20C alkyl) in an amount of 0.1-20wt.% based on the pigment to a vehicle for the offset ink.</p> |
