Patent US5262268A successfully refreshed from Google Patents.
US5262268A
Expired / Lapsed
US
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Method of pigment dispersion in colored toner
Assignee: Xerox Corp
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Filing: 1992-03-06
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Granted: 1993-11-16
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Expires: 2012-03-06
Abstract
Abstract A pigment wet cake is blended and extruded directly with a resin and other constituents in the manufacture of a toner.
Inventors
- 👤 Jacques C. Bertrand
- 👤 Don B. Jugle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:35
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0802; G03G9/0812; G03G9/081
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
36 words
A method of forming a colored toner, comprising: mixing a pigment wet cake directly into the toner resin in an extruder by melt-blending the toner resin and pigment wet cake; and removing water from said extruder.
Claim 2
Independent Claim
36 words
A method of forming a colored toner, comprising: mixing a pigment wet cake directly into the toner resin in an extruder by melt-blending the toner resin and pigment wet cake; and removing water from said extruder.
Claim 3
Dependent Claim
32 words
The method of claim 1, further comprising pre-mixing the pigment wet cake with the toner resin in a high energy mixer prior to extruding the pigment wet cake into the toner resin.
Claim 4
Dependent Claim
11 words
The method of claim 2, wherein said mixer is a blender.
Claim 5
Dependent Claim
14 words
The method according to claim 1, wherein said extruder is a twin screw extruder.
Claim 6
Dependent Claim
24 words
The method according to claim 1, wherein said water in contact with the pigment from said wet cake is displaced by said toner resin.
Claim 7
Dependent Claim
24 words
The method of claim 1, further comprising simultaneously adding additives into the extruder while the toner resin is mixing with the pigment wet cake.
Claim 8
Dependent Claim
22 words
The method of claim 1, further comprising adding other additives into the toner resin prior to mixing with the pigment wet cake.
Claim 9
Dependent Claim
23 words
The method of claim 6, wherein said additives are selected from the group consisting of stabilizers, waxes, charge control additives, and mixtures thereof.
Claim 10
Dependent Claim
26 words
The method of claim 1, further comprising removing water during the melt-blending step by applying a vacuum during the melt-blending of the resin and the pigment.
Claim 11
Dependent Claim
19 words
The method of claim 2, wherein the pigment wet cake is pre-mixed with the toner resin at room temperature.
Claim 12
Dependent Claim
36 words
The method of claim 1, wherein the extruder is operated at a temperature from above a melting point of the resin to a temperature which fluidizes extrudates and causes the extrudates to exit the extruder freely.
Claim 13
Dependent Claim
34 words
The method of claim 1, wherein the pigment wet cake comprises about 40% by weight water to about 85% by weight water, amd about 15% by weight pigment to about 60% by weight pigment.
Claim 14
Dependent Claim
36 words
The method of claim 1, wherein the colored toner comprises from about 1. % by weight pigment to about 20% by weight pigment, and from about 80% by weight resin to about 99% by weight resin.
Claim 15
Independent Claim
43 words
A method of forming a colored toner, comprising: forming a pigment wet cake with water; melt-blending the wet cake directly into a toner resin to form a melt-blended mixture of toner resin and pigment wet cake; and removing water from the melt-blended mixture.
Claim 16
Independent Claim
43 words
A method of forming a colored toner, comprising: forming a pigment wet cake with water; melt-blending the wet cake directly into a toner resin to form a melt-blended mixture of toner resin and pigment wet cake; and removing water from the melt-blended mixture.
Claim 17
Dependent Claim
26 words
The method of claim 14, further comprising pre-mixing the pigment wet cake with the toner resin prior to melt-blending the wet cake into the toner resin.
Claim 18
Dependent Claim
20 words
The method according to claim 14, wherein said water with the pigment wet cake is displaced by said toner resin.
Claim 19
Dependent Claim
22 words
The method of claim 14, further comprising adding other additives into the toner resin prior to melt-blending with the pigment wet cake.
Claim 20
Dependent Claim
25 words
The method of claim 14, further comprising removing said water by applying a vacuum during the melt-blending of the resin and the pigment wet cake.
Claim 21
Dependent Claim
19 words
The method of claim 15, wherein the pigment wet cake is pre-mixed with the toner resin at room temperature.
Claim 22
Dependent Claim
39 words
The method of claim 14, wherein the melt-blending step is carried out at a temperature from above a melting point of the resin to a temperature which fluidizes extrudates and causes the extrudates to exit the melt-blended mixture freely.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-15 | 1997-05-17 | 1997-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-15 | 2001-05-17 | 2001-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-15 | 2005-05-17 | 2005-11-16 | $7700.00 | Window Closed / Lapsed |