COLORING COMPOSITION FOR NEW CLAY MINERAL-BASED PRESSURE-SENSITIVE COPLYING PAPER AND WATER PAINT COMPOSITION THEREWITH

摘要

PURPOSE:To obtain a coloring composition suitable for printing papers and capable of exhibiting clear-cut, thick coloring performance from a specific colorant derived from a clay mineral having a laminar structure consisting of regular tetrahedral silica and a colorant containing a specific clay mineral. CONSTITUTION:A coloring composition contains 3wt% or more a colorant (1) derived from a clay mineral having a laminar structure consisting of regular tetrahedral silica (I), having features that a diffraction pattern based on regular tetrahedral silica crystal having a laminar structure is shown by an electronic rays diffraction (a), a diffraction pattern based on said crystal having laminar structure is not shown by X-ray diffraction (b), and silicon and magnesium and/ or aluminum, besides oxygen, are contained (c), and a colorant (2) composed of a mixture of dioctahedral type montmorillonite clay mineral treated by an acid (II) and natural dioctahedral type montmorillonite clay mineral or the dioctahedral type montmorillonite clay mineral alone.