Toner processes
View Patent ↗A toner process comprising mixing a colorant dispersion with a latex, a wax dispersion, and a coagulant, and wherein the polymer present in the latex possesses a gel content of from about 0.5 to about 4.5 weight percent, a polymer melt flow index (MFI) of from about 20 to about 45 grams/10 minutes at about from about 115° C. to about 145° C., the crosslinking molecular weight M c of the polymer being from about 12,000 to about 200,000, and the crosslinking density M e of the polymer being from about 1.2×10 −9 to about 2×10 −7 /Kmole.
1. A toner process comprising mixing a colorant dispersion with a latex, a wax dispersion, and a coagulant, and wherein the polymer present in the latex possesses a gel content of from about 0.5 to about 4.5 weight percent, a polymer melt flow index (MFI) of from about 20 to about 45 grams/10 minutes at about from about 115° C. to about 145° C., the crosslinking molecular weight M c of the polymer being from about 12,000 to about 200,000, and the crosslinking density M e of the polymer being from about 1.2×10 −9 to about 2×10 −7 /Kmole.
2. A process in accordance with claim 1 wherein said melt flow index is measured with an about 2.2 kilograms load force.
3. A process in accordance with claim 1 wherein said melt flow index is at a temperature of from about 125° C. to about 135° C.
4. A process in accordance with claim 1 wherein said melt flow index is at a temperature of about 130° C.
5. A process in accordance with claim 1 wherein said gel content is from about 0.8 to about 4 weight percent.
6. A process in accordance with claim 1 wherein said gel content is from about 1 to about 3.5 weight percent.
7. A process in accordance with claim 1 wherein said gel content is about 1 to about 3 weight percent.
8. A process in accordance with claim 1 wherein said melt flow index (MFI) is from about 25 to about 40 grams/10 minutes.
9. A process in accordance with claim 1 wherein said melt flow index (MFI) is from about 30 to about 40 grams/10 minutes.
10. A process in accordance with claim 1 wherein said melt flow index (MFI) is from about 20 to about 45 grams/10 minutes at a temperature of from about 125° C. to about 135° C.
11. A process in accordance with claim 1 wherein said melt flow index (MFI) is from about 25 to about 40 grams/10 minutes at a temperature of from about 127° C. to about 132° C.
12. A process in accordance with claim 1 wherein said melt flow index (MFI) is from about 30 to about 40 grams/10 minutes at a temperature of from about 127° C. to about 132° C.
13. A process in accordance with claim 1 wherein said melt flow index (MFI) is from about 32 to about 40 grams/10 minutes at a temperature of about 130° C.
14. A process in accordance with claim 1 wherein said melt flow index (MFI) is about 35 grams/10 minutes at a temperature of from about 127° C. to about 132° C.
15. A process in accordance with claim 1 wherein said crosslinking molecular weight M c is from about 15,000 to 150,000, and the crosslinking density M e of the polymer being from about 1.5×10 −9 to about 1.5×10 −7 /Kmol.
16. A process in accordance with claim 1 wherein said crosslinking molecular weight M c is from about 20,000 to about 100,000.
17. A process in accordance with claim 1 wherein said crosslinking density M e of the polymer is from about 5×10 −9 to about 1.2×10 −7 /Kmol.
18. A process in accordance with claim 1 wherein said crosslinking molecular weight M c is from about 20,000 to about 80,000, and said crosslinking density M e is from about 1×10 −8 to about 1×10 −7 /Kmol.
19. A process in accordance with claim 1 wherein the polymer present in the latex possesses a gel content of about 1.5 weight percent, a polymer melt flow index (MFI) of about 35 grams/10 minutes at about 130° C., the crosslinking molecular weight M c of the polymer being about 35,000, and the crosslinking density M e of the polymer being about 5×10 −8 /Kmole.
20. A process in accordance with claim 1 wherein said toner is generated by the aggregation and coalescence of said latex polymer, said wax, and said colorant.
21. A process in accordance with claim 20 wherein said aggregation is accomplished by heating at a temperature of below about the glass transition temperature of said polymer.
22. A process in accordance with claim 20 wherein said temperature is from about 40° C. to about 70° C.
23. A process in accordance with claim 20 wherein said coalescence is accomplished by heating at a temperature of about above the glass transition temperature of said polymer.
24. A process in accordance with claim 23 wherein said heating is at a temperature of from about 80° C. to about 95° C.
25. A process in accordance with claim 20 wherein said aggregation is accomplished by heating at a temperature of from about 35° C. to about 50° C., and said coalescence is accomplished by heating at a temperature of from about 70° C. to about 98° C.
26. A process in accordance with claim 1 wherein the toner possesses a minimum fix temperature (MFT) of about 100° C. to about 180° C.
27. A process in accordance with claim 26 wherein the toner hot offset temperature (HOT) is from about 195° C. to about 250° C.
28. A process in accordance with claim 1 wherein said coagulant is comprised of polymetal chloride.
29. A process in accordance with claim 1 wherein said polymer is selected from the group comprised of poly(styrene-butadiene), poly(methylstyrene-butadiene), poly(methyl methacrylate-butadiene), poly(ethyl methacrylate-butadiene), poly(propyl methacrylate-butadiene), poly(butyl methacrylate-butadiene), poly(methyl acrylate-butadiene), poly(ethyl acrylate-butadiene), poly(propyl acrylate-butadiene), poly(butyl acrylate-butadiene), poly(styrene-isoprene), poly(methylstyrene-isoprene), poly(methyl methacrylate-isoprene), poly(ethyl methacrylate-isoprene), poly(propyl methacrylate-isoprene), poly(butyl methacrylate-isoprene), poly(methyl acrylate-isoprene), poly(ethyl acrylate-isoprene), poly(propyl acrylate-isoprene), poly(butyl acrylate-isoprene), poly(styrene-propyl acrylate), poly(styrene-butyl acrylate), poly(styrene-butadiene-acrylic acid), poly(styrene-butadiene-methacrylic acid), poly(styrene-butadiene-acrylonitrile-acrylic acid), poly(styrene-butyl acrylate-acrylic acid), poly(styrene-butyl acrylate-methacrylic acid), poly(styrene-butyl acrylate-acrylononitrile), poly(styrene-butyl acrylate-acrylononitrile-acrylic acid), poly(styrene-butadiene-β-carboxyethyl, acrylate), poly(styrene-butadiene-acrylonitrile-β-carboxyethyl acrylate), poly(styrene-butyl acrylate-β-carboxyethyl acrylate), and poly(styrene-butyl acrylate-acrylononitrile-β-carboxyethyl acrylate).
30. A process in accordance with claim 1 wherein said coagulant is polymetal halide of a polyaluminum chloride, a polyaluminum sulfosilicate, or a polyaluminum sulfate.
31. A process in accordance with claim 1 wherein said wax is selected in an amount of from about 5 to about 20 weight percent.
32. A process in accordance with claim 1 wherein said colorant is a cyan, a magenta, a yellow, a black, or mixtures thereof.
33. A process in accordance with claim 1 wherein said coagulant is comprised of a mixture of coagulants of a polymetal halide, and a second cationic coagulant wherein the first coagulant is present in the amount of about 0.02 to about 0.2 percent by weight of toner, and the second coagulant is present in the amount of about 0.05 to about 2 percent by weight of toner.
34. A process in accordance with claim 1 wherein said colorant is a carbon black.
35. A process in accordance with claim 1 wherein said colorant is a pigment, or a dye.
36. A process in accordance with claim 20 wherein the aggregation temperature is from about 45° C. to about 60° C., and wherein the coalescence or fusion temperature is from about 80° C. to about 95° C., and wherein said coagulant is a polyaluminum halide.
37. A process comprising heating a colorant dispersion with a latex, a wax dispersion, and a coagulant, and wherein the polymer present in the latex possesses a gel content of from about 0.5 to about 5 weight percent, a polymer melt flow index (MFI) of from about 20 to about 45 grams/10 minutes at about from about 115° C. to about 145° C., the crosslinking molecular weight M c of the polymer being from about 12,000 to about 200,000, and the crosslinking density M e of the polymer being from about 1.2×10 −9 to about 2×10 −7 /Kmole.
38. A process comprising heating a colorant dispersion with a latex, a wax dispersion, and a coagulant, and wherein the polymer present in the latex possesses a gel content of from about 0.5 to about 5 weight percent, a polymer melt flow index (MFI) of from about 20 to about 45 grams/10 minutes at about from about 115° C. to about 145° C., the crosslinking molecular weight M c of the polymer being from about 12,000 to about 200,000, and the crosslinking density M e of the polymer being from about 1.2×10 −9 to about 2×10 −7 /Kmole; and wherein said heating comprises a first and second heating, and wherein said second heating is above the temperature of said first heating.