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US4886729A
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Positively charged liquid developer compositions
Assignee: Xerox Corp
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Filing: 1988-07-15
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Granted: 1989-12-12
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Expires: 2008-07-15
Abstract
Abstract A positively charged liquid developer composition comprised of polymer particles, a hydrocarbon liquid component, a charge director comprised of lecithin, and as pigment particles the beta crystalline form of copper phthalocyanine.
Inventors
- 👤 Bernard Grushkin
- 👤 David E. Hutka
- 👤 Louis V. Isganitis
- 👤 Edward J. Radigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:38
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/122
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
32 words
A positively charged liquid developer composition comprised of polymer particles, a hydrocarbon liquid component, a charge director comprised of lecithin, and as pigment particles the beta crystalline form K7080 of copper phthalocyanine.
Claim 2
Dependent Claim
32 words
A positively charged liquid developer composition comprised of polymer particles, a hydrocarbon liquid component, a charge director comprised of lecithin, and as pigment particles the beta crystalline form K7080 of copper phthalocyanine.
Claim 3
Dependent Claim
14 words
An ink composition in accordance with claim 1 wherein the polymer particles are Elvax.
Claim 4
Dependent Claim
17 words
An ink composition in accordance with claim 2 wherein the polymer component particles are Elvax II 5720.
Claim 5
Dependent Claim
30 words
An ink composition in accordance with claim 1 wherein the polymer component is present in an amount of from about 90 percent by weight to about 75 percent by weight.
Claim 6
Dependent Claim
30 words
An ink composition in accordance with claim 1 wherein the pigment particles are present in an amount of from about 10 percent by weight to about 25 percent by weight.
Claim 7
Dependent Claim
35 words
An ink composition in accordance with claim 1 wherein the charge director is present in an amount of from about 0.5 percent by weight to about 5 percent by weight of the pigmented polymer particles.
Claim 8
Dependent Claim
23 words
An ink composition in accordance with claim 1 wherein the copper phthalocyanine is Pigment Blue 15:3, Color Index No. C1741060:3, Heliogen Blue K7080.
Claim 9
Dependent Claim
15 words
An ink composition in accordance with claim 1 wherein the hydrocarbon liquid is an Isopar®.
Claim 10
Dependent Claim
22 words
An ink composition in accordance with claim 7 wherein the Isopar® is selected from the group consisting of Isopar® G and L.
Claim 11
Dependent Claim
46 words
A method for affecting the development of negatively charged images which comprises providing a negatively charged imaging member; subsequently developing the images formed with the ink composition of claim 1; thereafter tranferring the developed image to a suitable substrate; and optionally permanently affixing the image thereto.
Claim 12
Dependent Claim
29 words
A method of imaging in accordance with claim 10 wherein the developed image is transferred to a substrate in an amount of from about 80 to about 95 percent.
Claim 13
Dependent Claim
14 words
A method of imaging in accordance with claim 10 wherein the substrate is paper.
Claim 14
Dependent Claim
28 words
A method of imaging in accordance with claim 10 wherein the ink selected contains therein a copper phthalocyanine Pigment Blue 15:3, Color Index No. C1741060:3, Heliogen Blue K7080.
Claim 15
Dependent Claim
46 words
A method for affecting the development of negatively charged images which comprises providing a negatively charged imaging member; subsequently developing the images formed with the ink composition of claim 6; thereafter transferring the developed image to a suitable substrate; and optionally permanently affixing the image thereto.
Claim 16
Dependent Claim
16 words
A method in accordance with claim 14 wherein the hydrocarbon liquid for the ink is Isopar®.
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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) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |