Claims
- 1. A process for producing a toner for electrophotography which comprises polymerizing a polymerizable monomer dispersed by emulsification in the presence of a colorant and/or a magnetic powder to prepare a principal resin component, effecting the coagulation of the resulting polymerization liquid by adding a coagulating agent in such a way that the particles in the liquid after coagulation have diameters suitable as a toner, and then heating the resulting coagulated liquid at a temperature no lower than the glass transition point of the principal resin component after coagulation.
- 2. A process according to claim 1, wherein the heating of the particles is conducted by heating the polymerization liquid after coagulation.
- 3. A process according to claim 1, wherein the heating of the particles is conducted at a temperature not lower than the glass transition point of the principal resin component and not higher than 150.degree. C.
- 4. A process according to claim 1, wherein the heating of the particles is conducted at a temperature 25.degree. to 60.degree. C. higher than the glass transition point of the principal resin component.
- 5. A process according to claim 1, wherein the coagulating agent is added in the coagulation in an amount of 0.1 to 5 times the weight of the emulsifier present in the polymerization liquid.
- 6. A process according to claim 1, wherein the polymerization initiator used in the polymerization is an oil soluble initiator and/or a water soluble initiator.
- 7. A process according to claim 1, wherein the dispersion by emulsification is conducted by means of a highspeed shear dispersing machine.
- 8. A process according to claim 1, wherein the polymerizable monomer comprises 40 100% by weight of styrene or one or more derivatives thereof.
- 9. A process according to claim 1, wherein a liquid dispersion of an offset prevention agent is added to the polymerization liquid at the time when the conversion is 95% by weight or higher.
- 10. A process according to claim 1, wherein a liquid dispersion of an offset prevention agent is added to and mixed with the polymerization liquid before or after the coagulation.
- 11. A process according to claim 1, wherein the particles after coagulation are washed with warm water.
- 12. A process according to claim 11, wherein the temperature of the warm water is 40.degree. to 60.degree. C.
- 13. A process for producing a toner for electrophotography which comprises polymerizing a polymerizable monomer dispersed by emulsification in the presence of a colorant and/or a magnetic powder to prepare a principal resin component, effecting the coagulation of the resulting polymerization liquid by adding a coagulant in such a way that the particles in the liquid after coagulation have diameters suitable as a toner, and then heating the resulting coagulated liquid at a temperature not lower than the glass transition point of the principal resin component after coagulation.
- 14. A process according to claim 13, wherein the heating of the resulting coagulated liquid is conducted at a temperature not lower than the glass transition point of the principal resin component and not higher than 150.degree. C.
- 15. A process according to claim 13, wherein the heating of the resulting coagulated liquid is conducted at a temperature 25.degree. to 60.degree. higher than the glass transition point of the principal resin component.
Priority Claims (5)
Number |
Date |
Country |
Kind |
59-77064 |
Apr 1984 |
JPX |
|
59-81483 |
Apr 1984 |
JPX |
|
60-8917 |
Jan 1985 |
JPX |
|
60-8919 |
Jan 1985 |
JPX |
|
60-8918 |
Feb 1985 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 06/724,202, filed Apr. 17, 1985.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3391082 |
MacClay |
Jul 1968 |
|
4473628 |
Kasuya et al. |
Sep 1984 |
|
4514487 |
Kasuya et al. |
Apr 1985 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
895943 |
Mar 1972 |
CAX |
1404061 |
Aug 1975 |
GBX |
2070029 |
Sep 1981 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
724202 |
Apr 1985 |
|