Process for producing encapsulated toner

Details Process for producing encapsulated toner Process for producing encapsulated toner

1987-09-23

1990-02-27

Goodrow, John L.

Radiation imagery chemistry: process, composition, or product th

Microcapsule, process, composition, or product

4301066, 428403, G03G 1306, G03G 908

Patent

active

049045628

ABSTRACT:
An encapsulated toner for electrophotography is produced through a process, comprising: preparing a solution of a shell material resin set to an acidic (or basic) pH region; dispersing solid core particles in the solution to form a dispersion; changing the pH of the dispersion to a pH region, which is preferably a basic (or acidic) pH region, where the shell material resin is precipitated from the dispersion; and coating the solid core particles with the precipitated shell material resin. The shell material is preferably a proton-attracting basic (or dissociative acidic) vinyl-type copolymer and is dissolved in a pH-adjusted aqueous medium comprising water and a polar solvent, such as a lower alcohol. Thus, an encapsulated toner with excellent triboelectric chargeability and environmental characteristic is prepared without coalescence of capsules or formation of free shells.

REFERENCES:
patent: 4533617 (1985-08-01), Inoue et al.
patent: 4576890 (1986-03-01), Hosoi
patent: 4581312 (1986-04-01), Nakahara et al.
patent: 4610945 (1986-09-01), Matsuoka et al.
patent: 4626490 (1986-12-01), Yamazaki et al.
patent: 4642281 (1987-02-01), Kakimi et al.
Ullmanns Encyklopadie der technischen Chemie, 4th Edition, vol. 16, 1987, p. 679.

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