| 摘要 |
PROBLEM TO BE SOLVED: To record a clear multi-color coloring image excellent in color separability by a method wherein a matrix includes dye precursor-containing composite particles and individual particles containing a second dye precursor, which produces color having the color tone different from that of the first dye precursor. SOLUTION: Dye precursor containing particle component is obtained by dissolving a first dye precursor under heat in the solvent consisting of a multivalent isocyanate compound-containing polymeric component and then emulsion- dispersing the resultant solution in hydrophilic protective colloid solution so as to join the resultant emulsion-dispersed solution to the polymerization reaction of the multivalent isocyanate compound containing polymeric component and includes a matrix made of polyurea or polyurethane-polyurea resin, composite particles included in the matrix and made of first type precursor and individual particles containing second dye precursor, which produces color having the color tone different from that of the first dye precursor. Thus, the first dye precursor shows high separability due to the matrix made of polymeric compound, resulting in reducing the development of ground fogging by means of heat and humidity. |
