Toner formulations having improved toner usage efficiency and method to make the same
US-9217939-B2 · Dec 22, 2015 · US
Formulation for a developer mix having tribocharge uniformity across different temperature and humidity conditions
US9535353B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9535353-B2 |
| Application number | US-201414580852-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 23, 2014 |
| Priority date | Dec 23, 2014 |
| Publication date | Jan 3, 2017 |
| Grant date | Jan 3, 2017 |
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- Title
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Abstract
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A developer mix formulation having tribocharge uniformity across varying temperature and humidity conditions is provided. A developer mix used in a dual component development (DCD) system is a mixture of toner particles and magnetic carrier particles. Tribocharge uniformity is achieved in the developer mix by using magnetic carrier particles having surface additives on its surface. Surface additives include but are not limited to silica, titania and alumina.
First claim
Opening claim text (preview).
What is claimed is: 1. A developer mix formulation to be used in an electrophotographic imaging device comprising: toner particles, magnetic carrier particles having a polymer coating on their outer surface; and one or more extra particular additives selected from the group consisting of silica, titania and alumina or combinations thereof surface treated on the outer surface of the polymer coated magnetic carrier particles. 2. The developer mix formulation of claim 1 , wherein the polymer coating is acrylic. 3. The developer mix formulation of claim 1 wherein the polymer coated magnetic carrier particles have a ferrite core. 4. The developer mix formulation of claim 1 wherein the polymer coated magnetic carrier particles have an average particle size between 30 μm to about 50 μm and a saturation magnetization of 50 and 120 emu/g (A·m 2 /kg). 5. The developer mix formulation of claim 1 , wherein the extra particulate additives are surface treated with a hydrophobizing agent selected from a group consisting of hexamethyldisilazane, polydimethylsiloxane, dimethyldiethoxysiloxane, octyltriethoxysilane and combinations thereof. 6. The developer mix formulation of claim 1 , wherein the extra particulate additives have an average primary particle size in the range of about 7 nm to about 100 nm. 7. The developer mix formulation of claim 1 , wherein the extra particulate additives are present in the range of about 0.05% to about 1.0% by weight of the polymer coated magnetic carrier particles. 8. The developer mix formulation of claim 1 , wherein the extra particulate additives are present in the range of about 0.05% to about 0.15% by weight of the polymer coated magnetic carrier particles. 9. The developer mix formulation of claim 1 wherein the extra particulate additive is titania. 10. The developer mix formulation of claim 1 wherein the extra particulate additive is silica.
Assignees
Inventors
Classifications
Macromolecular components of coatings · CPC title
- G03G9/1139Primary
Inorganic components of coatings · CPC title
containing silicon atoms · CPC title
obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title
- G03G9/0808Primary
by dry mixing the toner components in solid or softened state · CPC title
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- What does patent US9535353B2 cover?
- A developer mix formulation having tribocharge uniformity across varying temperature and humidity conditions is provided. A developer mix used in a dual component development (DCD) system is a mixture of toner particles and magnetic carrier particles. Tribocharge uniformity is achieved in the developer mix by using magnetic carrier particles having surface additives on its surface. Surface addi…
- Who is the assignee on this patent?
- Lexmark Int Inc
- What technology area does this patent fall under?
- Primary CPC classification G03G9/1139. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jan 03 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).