Processes for aquabulk polymerization to produce high purity toners
AssigneeXerox Corporation
InventorAllan K. Chen
Life of this patent
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Abstract
A surfactant stabilizer free heat transfer bulk polymerization process for the preparation of a polymer or polymers which comprises adding water to a reaction vessel; heating the reaction vessel; adding to the reaction vessel a solution of monomer or monomers and initiators; heating the reaction vessel contents; increasing the temperature in the reaction vessel to from between about 95.degree. to about 105.degree. C. thereby removing water therefrom; and subsequently further heating the vessel contents to an effective temperature to enable said polymer or said polymers.
Claims21
A surfactant stabilizer free heat transfer bulk polymerization process for the preparation of a high purity toner consisting essentially of adding water to a reaction vessel, which water is added in an amount of from about 20 to about 60 percent based on the reaction vessel contents;
- heating the reaction vessel at a temperature of from about 30.degree. C. to about 110.degree. C.;
- adding to the reaction vessel a solution of monomer or monomers and initiator or initiators;
- heating the reaction vessel contents at a temperature of from about 80.degree. C. to about 95.degree. C.;
- increasing the temperature in the reaction vessel to from between about 95.degree. to about 105.degree. C. thereby removing water therefrom;
- and subsequently further heating at a temperature of from about 140.degree. C. to about 160.degree. C. the vessel contents to enable a molten polymer product, subsequently adding pigment thereto followed by cooling.
A surfactant stabilizer free heat transfer bulk polymerization process for the preparation of a high purity toner consisting essentially of adding water to a reaction vessel, which water is added in an amount range of from about 20 to about 60 percent based on the amount of the reaction vessel contents;
- heating the water at a temperature of from about 30.degree. C. to about 110.degree. C.;
- adding to the vessel a solution of monomer or monomers and initiators;
- heating the vessel a contents to from about 85.degree. to about 90.degree. C.;
- increasing the temperature of the reaction vessel contents to from between about 96.degree. to about 105.degree. C. thereby removing water by distillation therefrom;
- thereafter heating the vessel contents to a temperature of from between about 140.degree. to about 160.degree. C. to enable a molten polymer;
- subsequently adding pigment thereto followed by cooling wherein there results a toner with a polymer and which polymer contains substantially no ash present therein;
- removing the resulting hot viscous molten polymer from the reaction vessel.
Dependencies are inferred from the claim text.