Aqueous dispersion of a developer for pressure-sensitive recordi

Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...

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503216, 503219, C09D 1100

Patent

active

049503308

ABSTRACT:
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 ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be the same or different and represent H, halogen, alkyl of 1 to 9 carbon atoms, alkylene, cycloalkyl, cycloalkylene, phenyl, nucleus-substituted phenyl, aralkyl or nucleus-aralkyl; adjacent two of R.sub.1 to R.sub.4 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.degree. 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.degree. C. than the softening point of the developer, follower 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.

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patent: 4239815 (1980-12-01), Kato et al.
patent: 4374671 (1983-02-01), Hayashi et al.
patent: 4531139 (1985-07-01), Seitz
patent: 4620874 (1986-11-01), Booth, Jr. et al.
patent: 4688058 (1987-08-01), Ikeda et al.

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