Microcapsule toner and processes for preparation of microcapsule

Details Microcapsule toner and processes for preparation of microcapsule Microcapsule toner and processes for preparation of microcapsule

1995-03-08

1996-06-25

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

Microcapsule, process, composition, or product

42840221, G03G 9093

Patent

active

055298770

ABSTRACT:
The present invention provides a process for the preparation of a microcapsule excellent in core substance retention and mechanical strength as well as in environmental protection, safety and sanitation which can be used in the form of powder in a short capsulization time at a low cost. The present invention also provides an electrophotographic microcapsule toner having an excellent environmental stability of chargeability and a process for the preparation thereof. A novel process for the preparation of a microcapsule is provided which comprises emulsifying an oily composition containing a low boiling solvent in the presence of a cellulose dispersion stabilizer, and then subjecting the emulsion to interfacial polymerization so that it is capsulized, characterized in that said capsulization is effected at a temperature of not lower than the gelation temperature of said cellulose dispersion stabilizer while said low boiling solvent being removed from the oily droplets. In the case where a microcapsule toner is produced, as the oily composition there may be used one containing at least a coloring material, a fixing material and a shell-forming substance besides the low boiling solvent.

REFERENCES:
patent: 5118590 (1992-06-01), Kakimi
patent: 5332584 (1994-07-01), Scher et al.
patent: 5376495 (1994-12-01), Washizu et al.
Modern Plastics Encyclopedia, 1975-1976, "Plasticizers", E. J. Inchalik et al., pp. 222, 225, 228.
"Microcapsule" (Kondo et al.), Sankyo Shuppan, Nov. 1987, pp. 30-32.

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