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US 2014/0272703 A1Published application
Triboelectric charge control of toner through monomer ratio of shell latex
AssigneeXerox Corporation
InventorsPadam K. ANGRA, Christopher M. WOLFE
Life of this patent
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Abstract
Core/shell toner particles are made to have a desired triboelectric charge through control of the glass transition temperature (Tg) of the shell polymer and/or the ratio of styrene and at least one monomer for forming the polymer of the shell. The polymer is introduced onto core particles to form a shell thereon via an aggregation process.
Claims23
A method for preparing toner particles having a desired triboelectric charge, comprising:
- selecting a triboelectric charge for the toner particles, the toner particles comprising a core and a shell;
- selecting a styrene and at least one monomer selected from the group consisting of acrylates, butadienes, and methacrylates;
- obtaining a ratio of the styrene to the at least one monomer for forming a polymer, the polymer forming the shell, the ratio corresponding to the selected triboelectric charge;
- preparing a shell latex comprising the polymer derived from the styrene and the at least one monomer having the obtained ratio;
- introducing the shell latex to core particles;
- and
- aggregating to form toner particles having the shell comprised of the polymer on the core particles, and having the selected triboelectric charge.
4 more elements
A method for preparing aggregated toner particles having a desired triboelectric charge, comprising:
- predetermining a triboelectric charge for the aggregated toner particles based upon an application of the aggregated toner particles, the toner particles comprising a core and a shell;
- selecting a styrene and at least one monomer selected from the group consisting of acrylates, butadienes, and methacrylates for forming the shell;
- determining a necessary glass transition temperature value for a polymer derived from the selected styrene and the at least one monomer based upon the predetermined triboelectric charge;
- obtaining from predetermined information a ratio of the styrene to the at least one monomer necessary to form the polymer having the determined glass transition temperature value;
- preparing a shell latex comprising the polymer derived from the selected styrene and the at least one monomer having the obtained ratio;
- introducing the shell latex to aggregated core particles;
- and
- aggregating to form toner particles having the shell comprised of the polymer on the aggregated core particles, the toner particles having the predetermined triboelectric charge.
5 more elements
A method of aggregating toner particles, comprising:
- predetermining a triboelectric charge based upon an application of toner particles, the toner particles comprising a core and a shell;
- selecting a styrene and at least one monomer selected from the group consisting of acrylates, butadienes, and methacrylates for forming the shell;
- obtaining from predetermined information a ratio of the styrene to the at least one monomer necessary to achieve the toner particles having the predetermined triboelectric charge, the styrene and the at least one monomer forming a polymer;
- aggregating a mixture comprising a binder resin and a colorant to form the cores of the toner particles;
- adding a latex comprising the polymer derived from the styrene and the at least one monomer having the obtained ratio to the cores to form the shell over the cores and thereby obtain aggregated toner particles;
- coalescing the aggregated toner particles;
- and
- recovering the aggregated toner particles, wherein the toner particles have the predetermined triboelectric charge.
5 more elements
Dependencies are inferred from the claim text.