Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Process of making developer composition
Patent
1992-08-28
1994-01-11
Kight, III, John
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Process of making developer composition
430109, 430110, 430111, 430138, G03C 500
Patent
active
052780201
ABSTRACT:
A toner composition and processes for the preparation thereof comprising the steps of: (i) preparing a latex emulsion by agitating in water a mixture of a nonionic surfactant, an anionic surfactant, a first nonpolar olefinic monomer, a second nonpolar diolefinic monomer, a free radical initiator and a chain transfer agent; (ii) polymerizing the latex emulsion mixture by heating from ambient temperature to about 80.degree. C. to form nonpolar olefinic emulsion resin particles of volume average diameter from about 5 nanometers to about 500 nanometers; (iii) diluting the nonpolar olefinic emulsion resin particle mixture with water; (iv) adding to the diluted resin particle mixture a colorant or pigment particles and optionally dispersing the resulting mixture with a homogenizer; (v) adding a cationic surfactant to flocculate the colorant or pigment particles to the surface of the emulsion resin particles; (vi) homogenizing the flocculated mixture at high shear to form statically bound aggregated composite particles with a volume average diameter of less than or equal to about 5 microns; (vii) heating the statically bound aggregate composite particles to form nonpolar toner sized particles; (viii) optionally halogenating the nonpolar toner sized particles to form nonpolar toner sized particles having a halopolymer resin outer surface or encapsulating shell; and (ix) isolating the nonpolar toner sized composite particles.
REFERENCES:
patent: 4797339 (1989-01-01), Maruyama et al.
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patent: 4983488 (1991-01-01), Tan et al.
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patent: 5037716 (1991-08-01), Moffat
patent: 5139915 (1992-08-01), Moffat et al.
Ricoh RTU Spring '92, Nippon Carbide '127 Associated Particles.
Grushkin Bernard
Sacripante Guerino G.
Dodson Shelley A.
Haack John L.
Kight III John
Palazzo Eugene O.
Xerox Corporation
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