Back to results
US 8,618,192 B2Granted
Processes for producing polyester latexes via solvent-free emulsification
AssigneeXerox Corporation
InventorsSantiago Faucher, Joo T. Chung, Timothy L. Lincoln, Shigang Qiu, Yuhua Tong, Fumii Higuchi, Emine Irmak Serifoglu, Allan K. Chen, Brian J. Andaya, Joseph L. Leonardo
Life of this patent
Estimating the term…
Abstract
A process for making a latex emulsion suitable for use in a toner composition includes contacting at least one amorphous polyester resin with a viscosity reducing additive in the absence of an organic solvent to form a resin mixture either via an extruder or batch process, and adding a surfactant, neutralizing agent, and deionized water to the resin mixture.
Claims17
A process comprising:
- contacting at least one amorphous polyester resin with a viscosity reducing additive consisting of a crystalline polyester resin, wherein said additive is present in an amount of about 2%, in the absence of an organic solvent, to form a resin mixture having a softening point temperature of from about 95° C. to about 120° C. and a viscosity of from about 10 to about 1,000,000 Pa*S at about 130 C;
- contacting the resin mixture with a surfactant and a neutralizing agent;
- melt mixing the mixture;
- contacting the melt mixed resin mixture with de-ionized water to form an emulsion;
- and continuously recovering latex particles.
2 more elements
A process comprising:
- contacting at least one crystalline polyester resin with at least one amorphous polyester resin, in the absence of an organic solvent, wherein the at least one crystalline resin is present at about 2 weight %, to form a resin mixture having a softening point temperature of from about 95° C. to about 120° C. and a viscosity of from about 10 to about 1,000,000 Pa*S at about 130° C.;
- contacting the mixture with a surfactant and a neutralizing agent;
- melt mixing the mixture;
- contacting the melt mixed mixture with de-ionized water to form an oil in water emulsion;
- and continuously recovering latex particles.
2 more elements
A process comprising:
- contacting at least one crystalline polyester resin with at least one amorphous polyester resin, in the absence of an organic solvent, wherein the at least one crystalline resin is present at about 2 weight %, to form a resin mixture having a softening point of from about 95° C. to about 120° C. and a viscosity of from abut 10 to about 1,000,000 Pa*S at about 130° C.;
- contacting the mixture with a surfactant and a neutralizing agent;
- melt mixing the mixture;
- contacting the melt mixed mixture with de-ionized water to form an oil in water emulsion;
- continuously recovering latex particles;
- and contacting the latex particles with an optional colorant and an optional wax, and a second amorphous polyester resin to form a shell over the latex particles, thereby forming toner particles.
3 more elements
Dependencies are inferred from the claim text.