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.
OGAWA MASAHIDE
SATOU TEIJI
MIZOGUCHI YASUO
| JPS55103994A | 1980-08-08 | |||
| JPS5597982A | 1980-07-25 | |||
| JPS5139566A | 1976-04-02 | |||
| JPS5342910A | 1978-04-18 | |||
| JPS5429128A | 1979-03-05 | |||
| JPS54161637A | 1979-12-21 | |||
| JPS5715996A | 1982-01-27 |