Low melt toners and processes thereof
First Claim
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1. A process for preparing a low-melt toner, the process comprising:
- forming a pre-toner mixture comprising a first alkali sulfonated branched polyester resin, a second alkali sulfonated crystalline polyester resin and a colorant;
adding an aggregating agent to the pre-toner mixture and aggregating the mixture to form an aggregate mixture comprising a plurality of aggregate toner particles;
adjusting the pH of the aggregate mixture to between about 5 and about 7;
coalescing the aggregate mixture at a temperature of from about 5 to about 20°
C. above the glass transition temperature (Tg) of one of the first or second alkai sulfonated polyester resins to form a mixture of coalesced toner particles; and
cooling the mixture of coalesced toner particles.
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Abstract
A process for preparing toner particles and compositions adapted for use in preparing toners that comprise a blend of a first polyester resin with a second sharp melting polyester resin. The process includes forming an emulsion resin comprising a branched polyester resin, a crystalline polyester resin, a colorant, and optionally a wax. The resin mixture is aggregated using an aggregating agent, such as a zinc acetate solution, to form an aggregate mixture. The aggregate mixture is then coalesced at a temperature of from about 5 to about 20° C. above the Tg of the emulsion resin to produce the resultant toner particles.
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Citations
3 Claims
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1. A process for preparing a low-melt toner, the process comprising:
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forming a pre-toner mixture comprising a first alkali sulfonated branched polyester resin, a second alkali sulfonated crystalline polyester resin and a colorant; adding an aggregating agent to the pre-toner mixture and aggregating the mixture to form an aggregate mixture comprising a plurality of aggregate toner particles; adjusting the pH of the aggregate mixture to between about 5 and about 7; coalescing the aggregate mixture at a temperature of from about 5 to about 20°
C. above the glass transition temperature (Tg) of one of the first or second alkai sulfonated polyester resins to form a mixture of coalesced toner particles; andcooling the mixture of coalesced toner particles. - View Dependent Claims (2, 3)
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Specification