Xerox Corporation

Christopher K Ober

Kar P Lok

Melvin D Croucher

Michael L Hair

Randolph E Branston

Raymond W Wong

Francoise M Winnik

Disclosed is a dispersion polymerization process for affecting the preparation of particles which comprises dissolving in a suitable solvent a mixture of at least two first monomer components including at least one second monomer having covalently attached thereto a dye moiety, subsequently adding to the reaction mixture a polymerization initiator, thereafter affecting polymerization of the reaction mixture by heating, and separating the product particles therefrom.

Processes for colored particles from polymerizable dyes

Disclosed is a process for the preparation of ink compositions useful for jet printing processes which comprises (1) dissolving in water immiscible organic solvent a polymer composition and an organic oil soluble dye; (2) adding an aqueous phase water surfactant mixture thereto; (3) affecting emulsification thereof; and (4) subsequently evaporating from the aforementioned mixture the solvent thereby resulting in an ink with the dye trapped in the polymer particles suspended in the aqueous phase.

Preparation of ink jet compositions

Disclosed is a heterophase ink composition comprised of a water insoluble polymer dispersed in a liquid medium, the polymer containing therein an oil soluble dye, and a nonionic stabilizer permanently attached thereto.

Ink jet compositions and process for preparation thereof

Disclosed is an improved toner composition comprised of colored dyes and resin particles, having irreversibly anchored thereto stabilizer generated by the reaction of a stabilizer selected from the group consisting of hydroxy celluloses, poly(acrylic acids), poly(vinyl butyral), and poly(vinyl pyridines), with an alkyl halide, an alcohol, or a carboxylic acid.

Toner compositions with stabilizer irreversibly anchored thereto

Disclosed is an improved process for the preparation of polymer particles which comprises (1) providing a solvent medium having dispersed therein steric stabilizers, monomers, and initiator compounds; (2) subsequently adding thereto a crosslinking compound; (3) affecting polymerization of the resulting mixture by heating; and (4) thereafter separating the particles formed.

Dispersion polymerization process for toner compositions

An improved process for obtaining colored toner compositions by dispersion polymerization which comprises providing a monomer solution with stabilizer therein, polymerizing the resulting mixture, adding thereto a dye solution comprised of an organic solvent having dissolved therein oil soluble dyes, causing the dye solution to diffuse into the polymer particles, and subsequently separating the resulting toner particles, wherein the stabilizer is permanently attached to the toner polymer particles.

Process for colored toner compositions with controlled charges thereon

Dry monodispersed polymeric particles, a stabilized dispersion of such and a method for making are described. The dispersion comprises a polar dispersion medium having dispersed therein monodispersed particles comprising a thermoplastic resin core substantially insoluble in the dispersion medium formed from a styrene or butylmethacrylate containing monomer or mixtures thereof and having irreversibly anchored thereto, a nonionic amphipathic steric stabilizer comprising a graft copolymer having a portion formed from a styrene or butylmethacrylate containing monomer or mixture thereof and a portion formed from hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxybutyl methyl cellulose, hydroxypropyl methyl cellulose, ethyl cellulose or cellulose propionate. The stable dispersion is made by dissolving the nonionic cellulose ether in the polar dispersion medium and in the presence of a free radical initiator adding styrene or butylmethacrylate containing monomer a mixture thereof thereto, and permitting polymerization to take place.

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Oakville, Canada

Christopher K Ober