US4663264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid electrostatic developers containing aromatic hydrocarbons
Assignee: EIDP Inc
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Filing: 1986-04-28
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Granted: 1987-05-05
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Expires: 2006-04-28
Abstract
Abstract Liquid electrostatic developer having improved charging characteristics consisting essentially of (A) nonpolar liquid having a Kauri-butanol value of less than 30, (B) thermoplastic resin particles substantially nonsoluble in nonpolar liquid and aromatic hydrocarbon at ambient temperature and having an average by area particle size of less than 10 μm, (C) nonpolar liquid soluble ionic or zwitterionic compound, and (D) aromatic hydrocarbon having a Kauri-butanol value of greater than 30. The electrostatic liquid developers are useful in copying, making proofs including digital color proofs, lithographic printing plates, and resists.
Inventors
- 👤 Robert D. Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:16
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/125
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
70 words
A liquid electrostatic developer having improved charging characteristics consisting essentially of (A) nonpolar liquid having a Kauri-butanol value of less than 30, (B) thermoplastic resin particles substantially nonsoluble in nonpolar liquid and aromatic hydrocarbon at ambient temperature and having an average by area particle size of less than 10 μm, (C) nonpolar liquid soluble ionic or zwitterionic compound, and (D) aromatic hydrocarbon having a Kauri-butanol value of greater than 30.
Claim 2
Dependent Claim
70 words
A liquid electrostatic developer having improved charging characteristics consisting essentially of (A) nonpolar liquid having a Kauri-butanol value of less than 30, (B) thermoplastic resin particles substantially nonsoluble in nonpolar liquid and aromatic hydrocarbon at ambient temperature and having an average by area particle size of less than 10 μm, (C) nonpolar liquid soluble ionic or zwitterionic compound, and (D) aromatic hydrocarbon having a Kauri-butanol value of greater than 30.
Claim 3
Dependent Claim
61 words
A liquid electrostatic developer according to claim 1 wherein component (A) is present in 0.14 to 99.6% by weight, component (B) is present in 0.25 to 15.0% by weight, component (C) is present in 0.01 to 1.0% by weight, component (D) is present in 0.14 to 99.6% by weight, all weight percentages being based on the total weight of the developer.
Claim 4
Dependent Claim
14 words
A liquid electrostatic developer according to claim 1 wherein the aromatic hydrocarbon is toluene.
Claim 5
Dependent Claim
24 words
A liquid electrostatic developer according to claim 1 containing up to about 60% by weight of a colorant based on the weight of resin.
Claim 6
Dependent Claim
14 words
A liquid electrostatic developer according to claim 4 wherein the colorant is a pigment.
Claim 7
Dependent Claim
22 words
A liquid electrostatic developer according to claim 4 wherein the percent pigment in the thermoplastic resin is 1% to 50% by weight.
Claim 8
Dependent Claim
14 words
A liquid electrostatic developer according to claim 4 wherein the colorant is a dye.
Claim 9
Dependent Claim
16 words
A liquid electrostatic developer according to claim 1 wherein a fine particle size oxide is present.
Claim 10
Dependent Claim
33 words
A liquid electrostatic developer according to claim 1 wherein the thermoplastic resin is a copolymer of ethylene and an α,β-ethylenically unsaturated acid selected from the group consisting of acrylic acid and methacrylic acid.
Claim 11
Dependent Claim
18 words
A liquid electrostatic developer according to claim 1 wherein the thermoplastic resin is an ethylene vinyl acetate copolymer.
Claim 12
Dependent Claim
43 words
A liquid electrostatic developer according to claim 1 wherein the thermoplastic resin is a copolymer of ethylene (80 to 99.9%)/acrylic or methacrylic acid (20 to 0%)/alkyl ester of acrylic or methacrylic acid wherein alkyl is 1 to 5 carbon atoms (0 to 20%).
Claim 13
Dependent Claim
29 words
A liquid electrostatic developer according to claim 9 wherein the thermoplastic resin is a copolymer of ethylene (89%)/methacrylic acid (11%) having a melt index at 190° C. of 100.
Claim 14
Dependent Claim
23 words
A liquid electrostatic developer according to claim 1 wherein the particles have an average by area particle size of less than 5 μm.
Claim 15
Dependent Claim
15 words
A liquid electrostatic developer according to claim 1 wherein component (C) is Basic Barium Petronate.
Claim 16
Dependent Claim
13 words
A liquid electrostatic developer according to claim 1 wherein component (C) is lecithin.
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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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |