Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Process of making developer composition
Patent
1982-03-22
1983-08-30
Kittle, John E.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Process of making developer composition
G03G 908, C08J 320
Patent
active
044017421
ABSTRACT:
A method for the preparation of toners that exhibit relatively low conductivity (10.sup.-9 to 10.sup.-14 ohm.sup.-1 cm.sup.-1) and positive triboelectrical properties (5.0-30.mu. c/g) is disclosed. The process steps include first forming a homogeneous dispersion of both carbon black particles and particles of a second pigment saturated with monomer and initiator by intimately mixing at least one monomer, carbon black, particles of the second pigment, and a polymerization initiator and adding the mixture to a mixture of sufficient water and at least one alcoholic dispersing agent to form a homogeneous dispersion solution. The solution is then heated to a temperature sufficient to substantially complete the polymerization of the monomer and form a homogeneous polymeric dispersion of the carbon black particles and the particles of the second pigment. Thereafter a weak organic acid (PKa 3.0-6.0) or a weak acid anhydride (PKa 3.0-6.0) is added to the polymeric dispersion in an amount sufficient to substantially complete the esterification of the alcoholic dispersing agent and the toner particles are then recovered.
REFERENCES:
patent: 4077804 (1978-03-01), Vawzo
patent: 4107126 (1978-08-01), Burke
Goodrow John L.
Kittle John E.
Pitney Bowes Inc.
Scolnick Melvin J.
Scribner Albert W.
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