Toner compositions and processes
View Patent ↗Processes for producing toners are provided. The processes include determining the desired gloss for a given toner, and determining the desired amount of aluminum in the toner to obtain that gloss. Utilizing the processes of the present disclosure, the solids content of an emulsion utilized to produce such a toner, as well as the mixing speed utilized in the aggregation process and the temperature at which aggregation of the toner particles occurs, may then be selected to obtain toner particles possessing the desired amount of aluminum, and thus the desired gloss.
1. A process comprising:
determining a gloss level for a dry final toner produced with an aggregating agent comprising aluminum by reducing amount of aluminum remaining in the dry final toner to an amount to produce the gloss level, wherein the amount of aluminum in the dry final toner to produce the gloss level directly correlates with temperature in a freezing step;
providing one or more resins selected from the group consisting of an amorphous resin, a crystalline resin, and combinations thereof, optionally in combination with colorants and waxes to form a toner slurry;
adjusting the toner slurry to a pH of from about 2 to about 5, having an overall toner slurry solids content of from about 10% to about 20%;
homogenizing the toner slurry at a speed of from about 3,000 revolutions per minute (rpm) to about 4,000 rpm, in presence of the aggregating agent at a temperature from about 40° C. to about 60° C. to form a mixture;
aggregating the mixture to form aggregated particles at a temperature lower than a temperature to freeze particle size and at a speed of from about 100 rpm to about 900 rpm;
freezing particle size at a temperature from about 35° C. to about 60° C., wherein freezing comprises adding a chelating agent to said mixture, thereby forming toner particles; and
recovering the toner particles, wherein the temperature of freezing particle size of said toner comprising a black colorant is calculated using a formula as follows:
y= 2.616 x− 57.213 (III)
the temperature of freezing particle size of said toner comprising a magenta colorant is calculated using a formula as follows:
y= 3.8993 x− 87.31 (IV)
and the temperature of freezing particle size of said toner comprising a cyan colorant is calculated using a formula as follows:
y= 4.5171 x− 143.69 (V)
wherein y in each of the above formula III, IV, and V is the desired aluminum content in parts per million, and x in each of the above formula III, IV, and V is the temperature of freezing, in degrees Celsius.
2. The process of claim 1 , wherein the one of more resins comprise amorphous polyester resins and crystalline polyester resins.
3. The process of claim 1 , wherein the amorphous resin comprises an amorphous polyester resin comprising an alkoxylated bisphenol A fumarate/terephthalate based polyester or copolyester resin.
4. The process of claim 1 , wherein the crystalline resin is of the formula:
wherein b is from about 5 to about 2000 and d is from about 5 to about 2000.
5. The process of claim 1 , wherein the aggregating agent is selected from the group consisting of polyaluminum halides, polyaluminum silicates, and water soluble aluminum salts.
6. The process of claim 1 , wherein the aggregating agent is selected from the group consisting of polyaluminum chloride, polyaluminum bromide, polyaluminum fluoride, polyaluminum iodide, polyaluminum sulfosilicate, aluminum chloride, aluminum nitrite, aluminum sulfate, potassium aluminum sulfate, and combinations thereof.
7. The process of claim 1 , wherein said chelating agent comprises ethylenediamine tetraacetic add.
8. The process of claim 1 , wherein the toner particles have an aluminum content of from about 30 parts per million to about 1000 parts per million.
9. The process of claim 1 , wherein the toner has a peak gloss from about 10 ggu to about 100 ggu.
10. A process comprising:
determining a gloss level for a toner produced with an aggregating agent selected from the group consisting of polyaluminum halides, polyaluminum silicates, and water soluble aluminum salts by reducing amount of aluminum remaining in the toner to an amount to produce the gloss level, wherein the amount of aluminum in the toner to produce the gloss level directly correlates with temperature in a freezing step;
providing one or more resins comprising at least one amorphous resin and at least one crystalline resin, optionally in combination with colorants and waxes to form a toner slurry;
adjusting the toner slurry to a pH of from about 2 to about 5, having an overall toner slurry solids content of from about 10% to about 20%;
homogenizing the toner slurry at a speed of from about 3,000 revolutions per minute (rpm) to about 4,000 rpm at a temperature of from about 40° C. to about 60° C., in presence of the aggregating agent to form a mixture;
aggregating the mixture to form aggregated particles at a temperature lower than a temperature to freeze particle size and at a speed from about 100 rpm to about 900 rpm;
freezing particle size at a temperature of from about 35° C. to about 60° C., wherein freezing comprises adding a chelating agent to said mixture, thereby forming toner particles; and
recovering the toner particles,
wherein the temperature of freezing toner particle size of said toner comprising a black colorant is calculated using a formula as follows:
y= 2.616 x− 57.213 (III)
the temperature of freezing particle size of said toner comprising a magenta colorant is calculated using a formula as follows:
y= 3.8993 x− 87.31 (IV)
and the temperature of freezing particle size of said toner comprising a cyan colorant is calculated using a formula as follows:
y= 4.5171 x− 143.69 (V)
wherein y in each of the above formula III, IV, and V is the desired aluminum content in parts per million, and x in each of the above formula III, IV, and V is the temperature of freezing, in degrees Celsius.
11. The process of claim 10 , wherein the amorphous resin comprises an amorphous polyester resin comprising an alkoxylated bisphenol A fumarate/terephthalate based polyester or copolyester resin, and wherein the crystalline resin is of the formula:
wherein b is from about 5 to about 2000 and d is from about 5 to about 2000, and combinations thereof.
12. The process of claim 10 , wherein the aggregating agent is selected from the group consisting of polyaluminum chloride, polyaluminum bromide, polyaluminum fluoride, polyaluminum iodide, polyaluminum sulfosilicate, aluminum chloride, aluminum nitrite, aluminum sulfate, potassium aluminum sulfate, and combinations thereof.
13. The process of claim 10 , wherein said chelating agent comprises ethylene diamine tetraacetic acid.
14. The process of claim 10 , wherein the toner has a peak gloss from about 10 ggu to about 100 ggu.
15. A process comprising:
determining a gloss level for a highly pigmented dry final toner produced with an aggregating agent comprising aluminum, the highly pigmented toner selected from the group consisting of a black toner, a magenta toner, and a cyan toner, pigmented with from about 5% to about 50% pigment, by reducing the amount of aluminum remaining in the dry final toner to an amount to produce the gloss level, wherein the amount of aluminum in the toner to produce the gloss level directly correlates with temperature in a freezing step;
providing one or more aqueous dispersions, the aqueous dispersions comprising particles comprising particles of one or more resins, optionally in combination with colorants and waxes;
homogenizing the aqueous dispersions at a speed from about 3,000 revolutions per minute (rpm) to about 4,000 rpm and at a temperature of from about 40° C. to about 60° C., in the presence of the aggregating agent comprising aluminum to form a mixture;
aggregating the mixture to form aggregated particles at a temperature lower than a temperature to freeze particle size and at a speed from about 100 rpm to about 900 rpm;
freezing particle growth at a temperature of from about 35° C. to about 60° C. wherein freezing comprises adding a chelating agent to said mixture, thereby forming toner particles; and
recovering the toner particles,
wherein the temperature of freezing of the highly pigmented black toner particles is calculated using a formula as follows:
y= 2.616 x− 57.213 (III)
the temperature of freezing of the highly pigmented magenta toner is calculated using a formula as follows:
y= 3.8993 x− 87.31 (IV)
and the temperature of freezing of the highly pigmented cyan toner is calculated using a formula as follows:
y= 4.5171 x− 143.69 (V)
wherein y in each of the above formula III, IV, and V is the desired aluminum content in parts per million, and x in each of the above formula III, IV, and V is the temperature of freezing, in degrees Celsius.
16. The process of claim 15 , wherein the aggregating agent is selected from the group consisting of polyaluminum chloride, polyaluminum bromide, polyaluminum fluoride, polyaluminum iodide, polyaluminum sulfosilicate, aluminum chloride, aluminum nitrite, aluminum sulfate, potassium aluminum sulfate, and combinations thereof, and wherein heating the aggregated particles occurs at a temperature of from about 35° C. to about 60° C.
17. The process of claim 15 , wherein the one or more resins comprise an amorphous polyester resin comprising an alkoxylated bisphenol A fumarate/terephthalate based polyester or copolyester resin.
18. The process of claim 15 , wherein the one or more resins comprise a crystalline resin of the formula:
wherein b is from about 5 to about 2000 and d is from about 5 to about 2000, and combinations thereof.
19. The process of claim 15 , wherein the toner has a peak gloss from about 10 ggu to about 100 ggu.
20. The process of claim 15 , wherein said chelating agent comprises ethylene diamine tetraacetic acid.