Toner formulation using wax encapsulated with a styrene acrylate latex and method of preparing the same
View Patent ↗The present disclosure relates to a chemically prepared toner composition including a toner particle having a core including a first polymer binder, an styrene acrylate encapsulated wax latex, a pigment, and a shell formed around the core including a second polymer binder and method to make the same. The disclosed method of preparing the toner results in a change in the distribution of the components of the toner particle wherein the lower molecular weight resins, the pigment, and the wax are located away from the surface of the toner particle and the pigment is clinging to the edge of the wax domain.
1. A chemically prepared toner, comprising:
a core including a first polymer binder, a polymer encapsulated wax latex, a pigment; and
a shell formed around the core including a second polymer binder, wherein the core and shell form a toner particle having aggregated polymer encapsulated wax domains within the toner particles and the pigment is located around the edges of the aggregated polymer encapsulated wax domains and the pigment and wax domains are located away from the surface of the toner particle and wherein the polymer encapsulated wax latex is polymerized from a monomer solution including a hydrophilic monomer having one of a carboxyl (—COOH) functional group and a hydroxy (—OH) functional group and hydrophobic styrene and acrylate monomers.
2. The chemically prepared toner of claim 1 , wherein the hydrophobic acrylate monomer is an alkyl acrylate.
3. The chemically prepared toner of claim 2 , wherein the alkyl acrylate monomer is butyl acrylate.
4. The chemically prepared toner of claim 2 , wherein the alkyl acrylate monomer is lauryl acrylate.
5. The chemically prepared toner of claim 1 , wherein the glass transition temperature (Tg) of the latex is between 20° C. and 60° C.
6. The chemically prepared toner of claim 1 , wherein the first polymer binder and the second polymer binder each include a polyester resin.
7. The chemically prepared toner of claim 1 , further comprising a borax coupling agent between the outer surface of the core and the shell.
8. The chemically prepared toner of claim 1 , wherein the wherein the hydrophilic monomer having one of a carboxyl (—COOH) functional group is beta-carboxy ethyl acrylate.
9. The chemically prepared toner of claim 1 , wherein the wherein the hydrophilic monomer having one of a hydroxyl (—OH) functional group is hydroxyethyl methacrylate.