Chemically prepared toner formulation including a borax coupling agent
View Patent ↗A chemically prepared toner composition according to one example embodiment includes a core including a first polymer binder, a colorant and a release agent; a shell that is formed around the core and includes a second polymer binder; and a borax coupling agent between the core and the shell.
1. A chemically prepared toner composition, comprising:
a core having an outer surface, the core having components including a first polymer binder having functional groups, a colorant and a release agent;
a borax coupling agent located on the outer surface of the core; and
a shell formed around the outer surface of the core and the borax coupling agent, the shell including a second polymer binder having functional groups,
wherein the borax coupling agent is located between the core and the shell and bonds the shell to the outer surface of the core by forming hydrogen bonding between its hydroxyl groups and the functional groups present in the first and second polymers and collects the components of the toner core to the core before the shell is added thereby reducing the residual fine particles in the toner.
2. The chemically prepared toner composition of claim 1 , wherein the first polymer binder having functional groups and the second polymer binder having functional groups each include a polyester resin.
3. The chemically prepared toner composition of claim 2 , wherein the first polymer binder having functional groups includes a first polyester resin or mixture and the second polymer binder having functional groups includes a second polyester resin or mixture different from the first polyester resin or mixture.
4. The chemically prepared toner composition of claim 1 , wherein the first polymer binder having functional groups and the second polymer binder having functional groups each include a styrene polymer having functional groups.
5. The chemically prepared toner composition of claim 4 , wherein the first polymer binder having functional groups includes a first styrene polymer having functional groups or mixture and the second polymer binder having functional groups includes a second styrene polymer having functional groups or mixture different from the first styrene polymer having functional groups or mixture.
6. The chemically prepared toner composition of claim 1 , wherein the ratio of the first polymer binder having functional groups to the second polymer binder having functional groups is between about 20:80 and about 80:20 by weight.
7. The chemically prepared toner composition of claim 6 , wherein the ratio of the first polymer binder having functional groups to the second polymer binder having functional groups is between about 50:50 and about 80:20 by weight.
8. The chemically prepared toner composition of claim 1 , wherein the core and the shell include the same polymer binder having functional groups.