| 摘要 |
An aqueous dispersion of a developer for pressure-sensitive recording sheet, having superior handling performance and storage stability in a high concentration and a process for producing the dispersion are provided, which developer is expressed by the formula <CHEM> wherein R1, R2, R3 and R4 may be the same or different and represent H, halogen, C1 to C9 alkyl, alkylene, cycloalkyl, cycloalkylene, phenyl, nucleus-substituted phenyl, aralkyl or nucleus-aralkyl of 1-9C; adjacent two of R1 to R4 may form a ring; n is an integer of one or more; and M is Mg, Ca, Zn, Al, Fe, Co, Ni or a basic ion of the foregoing, and which developer has a softening point of 30 DEG C or higher and is dispersed in water, containing a dispersing agent, the size of particles of the developer being 0.3 to 5 mu in terms of average particle diameter, and the proportion of right spherical particles in the total particles being 50% or more; and which process comprises emulsifying-dispersing the developer in water containing a dispersing agent at a temperature higher by at least 30 DEG C than the softening point of the developer, followed by cooling, or dissolving the developer in an organic solvent, emulsifying-dispersing the solution in water containing a dispersing agent and distilling off the solvent from the dispersion on heating, or using a polyvinyl alcohol having a polymerization degree of 500 or more and a saponification degree of 70% or more. |
