Release Agent Formulation for Chemically Prepared Toner
OwnerRick Owen Jones, Lale Gokbudak Lovell +1inventors
InventorsRick Owen Jones, Lale Gokbudak Lovell, Denise Veronica Morland
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Abstract
A method for producing toner, and a toner composition, which includes polymer binder and a release agent composition that has relatively high viscosity and associated melting characteristics that improve filming resistance and/or fusing performance. The toner may be prepared by a chemical process wherein the toner particles may be grown in an aqueous solution to obtain a desired toner particle size.
Claims20
A method of producing toner, comprising:
- (a) forming an aqueous dispersion comprising polymer binder including a release agent and a stabilizing agent, wherein the polymer binder has a glass transition temperature (Tg) and the release agent has both a viscosity of at least 40 mPa*s at 120° C. over a shear range of 300 sec−1 to 1000 sec−1 and a DSC melting range (Tmr) of 40° C. to 120° C. at a heating rate of 10° C. minute;
- (b) heating below the polymer binder Tg and forming aggregates of 2-25 μm;
- and
- (c) heating at a temperature above the Tg of the polymer binder and fusing together the polymer binder and release agent and forming fused particles of polymer binder and release agent.
A method of producing toner, comprising:
- (a) forming an aqueous dispersion comprising polymer binder including a release agent and a stabilizing agent, wherein the polymer binder has a glass transition temperature (Tg) and the release agent has a viscosity of at least 40 mPa*s at 120° C. over a shear range of 300 sec−1 to 1000 sec−1, a DSC melting range (Tmr) of 40° C. to 120° C. at a heating rate of 10° C. minute and a DSC peak endothermic melting temperature (Tmp) of 65° C. to 105° C. at a heating rate of 10° C. minute;
- (b) adjusting pH and heating below the polymer binder Tg and forming aggregates of 2-25 μm;
- and
- (c) adjusting pH and ionizing said stabilizing agent and heating at a temperature above the Tg of the polymer binder and fusing together the polymer binder and release agent and forming fused particles of polymer binder and release agent.
A toner composition comprising polymer binder having a glass transition temperature (Tg), including a release agent, wherein the release agent has a viscosity of at least 40 mPa*s at 120° C. over a shear range of 300 sec−1 to 1000 sec−1 and a DSC melting range (Tmr) of 40° C. to 120° C. at a heating rate of 10° C. minute and a DSC peak endothermic melting temperature (Tmp) of 65° C. to 105° C. at a heating rate of 10° C. minute.
Dependencies are inferred from the claim text.