US4024292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for developing latent electrostatic images with ink
Assignee: Xerox Corp
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Filing: 1975-09-24
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Granted: 1977-05-17
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Expires: 1995-09-24
Abstract
Abstract Liquid developer compositions for development of latent electrostatic images are disclosed. The electrostatic printing inks dry at ambient temperatures by penetration into paper leaving a continuous film having excellent rub resistance on the surface. The non-volatile, low viscosity inks comprise about 3-20% pigment and/or dye, about 5-35% of resinous particles having a size of 5 microns or less and having glass transition temperatures close to or below ambient temperature, said resinous particles being dispersed in the liquid carrier, 0-25% dispersing agent and about 25-90% non-volatile, high boiling organic liquid carrier and/or solvent.
Inventors
- 👤 Chin H. Lu
- 👤 David A. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:51
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/131
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
A process for developing latent electrostatic images on a substrate comprising contacting the surface of the substrate containing the latent electrostatic image with a composition containing about 3-20 weight percent colorant agent, about 25-90 weight percent inert, non-volatile, high boiling organic carrier, about 3-35 weight percent organic resin having a glass transition temperature of about ambient temperature or below, said resin having a particle size of 5 microns or less dispersed in and insoluble in said carrier, and 0 to about 25 percent dispersing agent.
Claim 2
Dependent Claim
85 words
A process for developing latent electrostatic images on a substrate comprising contacting the surface of the substrate containing the latent electrostatic image with a composition containing about 3-20 weight percent colorant agent, about 25-90 weight percent inert, non-volatile, high boiling organic carrier, about 3-35 weight percent organic resin having a glass transition temperature of about ambient temperature or below, said resin having a particle size of 5 microns or less dispersed in and insoluble in said carrier, and 0 to about 25 percent dispersing agent.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the organic carrier comprises up to about 50% plasticizer.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein the composition further comprises an amount of drying acceleration agent sufficient to accelerate the drying of the composition.
Claim 5
Dependent Claim
36 words
The process of claim 3 wherein the drying acceleration agent is a cyclized rubber having a weight average molecular weight of about 13,000, said cyclized rubber being the reaction product of natural rubber and sulfuric acid.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the resin is in the form of an organosol.
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein the resin is a copolymer of maleic acid and butyl methacrylate having a weight-average molecular weight of about 31,000.
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein the ratio of resin to coloring agent is about 1:1.
Claim 9
Dependent Claim
30 words
The process of claim 1 wherein the coloring agent comprises at least 5 weight percent of the composition and the resin comprises at least 5 weight percent of the composition.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein the resin has a glass transition temperature of about 35° C. or less.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |