Chemically prepared core shell toner formulation including a styrene acrylate polyester copolymer used for the shell

Patent metadata

Field	Value
Publication number	US-9612545-B2
Application number	US-201514795173-A
Country	US
Kind code	B2
Filing date	Jul 9, 2015
Priority date	Jul 9, 2015
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A chemically prepared toner composition according to one example embodiment includes a core including at least one polymer binder, a colorant and a release agent; a shell that is formed around the core and includes a third polymer binder; and a borax coupling agent between the core and the shell. The binder for the shell is a styrene acrylic polyester copolymer having a glass transition temperature (Tg) between 55° C. to 65° C., a melt temperature (Tm) between 100° C. to 130° C., a peak molecular weight of about 12,000 and acid value from 10-28.

First claim

What is claimed is:

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 styrene acrylate polyester copolymer binder having functional groups,
wherein styrene acrylate polyester copolymer binder having functional groups in the shell has a peak molecular weight of about 12,000, and 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 binder and the styrene acrylate polyester copolymer binder.

2. The chemically prepared toner composition of claim 1 , wherein the polymer binder having functional groups in the core is a polyester resin or a mixture of different polyester resins.

3. The chemically prepared toner composition of claim 1 , wherein the polymer binder having functional groups in the core is a styrene acrylate resin or a mixture of different styrene acrylate resins.

4. The chemically prepared toner composition of claim 1 , wherein the polymer binder having functional groups in the core is a mixture including a styrene acrylate resin and a polyester resin or a mixture of multiple polyester and styrene acrylic resins.

5. The chemically prepared toner composition of claim 1 , wherein styrene acrylate polyester copolymer binder having functional groups in the shell has a glass transition temperature (Tg) between 55° C. to 65° C.

6. The chemically prepared toner composition of claim 1 , wherein styrene acrylate polyester copolymer binder having functional groups in the shell has a melt temperature (Tm) between 100° C. to 130° C.

7. The chemically prepared toner composition of claim 1 , wherein styrene acrylate polyester copolymer binder having functional groups in the shell has an acid value from 10-28.

8. 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 styrene acrylate polyester copolymer binder having functional groups and a glass transition temperature (Tg) between 55° C. to 65° C., a melt temperature (Tm) between 100° C. to 130° C., a peak molecular weight of about 12,000 and acid value from 10-28 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 binder and the styrene acrylate polyester copolymer binder.

Assignees

• Lexmark Int Inc

Inventors

• Bejat Ligia Aura
• Marin Goggin Claudia Alexandra
• Hammond Cory Nathan
• Jones Rick Owen
• Mcalpine Robert Watson
• Sun Jing X
• Yaron Peter Nikolaivich

Classifications

• G03G9/09342 Primary

  Inorganic compounds · CPC title

• G03G9/08755

  Polyesters · CPC title

• G03G9/09321

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• G03G9/09328

  obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• G03G9/09385

  Inorganic compounds · CPC title