US4780388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamines as adjuvant for liquid electrostatic developers
Assignee: EIDP Inc
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Filing: 1987-05-26
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Granted: 1988-10-25
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Expires: 2007-05-26
Abstract
Abstract Electrostatic liquid developer having improved charging characteristics consisting essentially of (A) nonpolar liquid having a Kauri-butanol value of less than 30, present in a major amount, (B) thermoplastic resin particles having an average by area particle size of less than 10 μm, (C) nonpolar liquid soluble ionic compound, and (D) at least one organic polyamine compound having at least 2 amino groups present on adjacent carbon atoms. Optionally, a colorant, e.g., a pigment; metallic soap can be present. The electrostatic liquid developer is useful in copying, making proofs including digital color proofs, lithographic printing plates, and resists.
Inventors
- 👤 James R. Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:25
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/135
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
75 words
An electrostatic liquid developer having improved charging characteristics consisting essentially of: (A) a nonpolar liquid having a Kauri-butanol value of less than 30, present in a major amount, (B) thermoplastic resin particles having an average by area particle size of less than 10 μm, (C) a nonpolar liquid soluble ionic compound, and (D) at least one organic polyamine compound having as the sole active substituents at least two amino groups present on adjacent carbon atoms.
Claim 2
Dependent Claim
75 words
An electrostatic liquid developer having improved charging characteristics consisting essentially of: (A) a nonpolar liquid having a Kauri-butanol value of less than 30, present in a major amount, (B) thermoplastic resin particles having an average by area particle size of less than 10 μm, (C) a nonpolar liquid soluble ionic compound, and (D) at least one organic polyamine compound having as the sole active substituents at least two amino groups present on adjacent carbon atoms.
Claim 3
Dependent Claim
14 words
An electrostatic liquid developer according to claim 1 herein the polyamine is ethylene diamine.
Claim 4
Dependent Claim
13 words
An electrostatic liquid developer according to claim 1 wherein the polyamine is hexamethylenetetraamine.
Claim 5
Dependent Claim
13 words
An electrostatic liquid developer according to claim 1 wherein the polyamine is ortho-phenylene-diamine.
Claim 6
Dependent Claim
13 words
An electrostatic liquid developer according to claim 1 wherein the polyamine is 1,2-diamino-cylohexane.
Claim 7
Dependent Claim
67 words
An electrostatic liquid developer according to claim 1 wherein component (A) is present in 99.9 to 85% by weight, component (B) is present in 0.1 to 15% by weight, based on the total weight of the developer, component (C) is present in an amount of 1 to 1000 mg/g developer solids, and polyamine component (D) is present in an amount of 1 to 1000 mg/g developer solids.
Claim 8
Dependent Claim
24 words
An electrostatic liquid developer according to claim 1 containing up to about 60% by weight of a colorant based on the weight of resin.
Claim 9
Dependent Claim
14 words
An electrostatic liquid developer according to claim 7 wherein the colorant is a pigment.
Claim 10
Dependent Claim
28 words
An electrostatic liquid developer according to claim 8 wherein the percent pigment in the thermoplastic resin is 1% to 60% by weight based on the weight of resin.
Claim 11
Dependent Claim
14 words
An electrostatic liquid developer according to claim 7 wherein the colorant is a dye.
Claim 12
Dependent Claim
16 words
An electrostatic liquid developer according to claim 1 wherein a fine particle size oxide is present.
Claim 13
Dependent Claim
18 words
An electrostatic liquid developer according to claim 1 wherein present in the thermoplastic resin is a metallic soap.
Claim 14
Dependent Claim
33 words
An electrostatic liquid developer according to claim 1 wherein the thermoplastic resin is a copolymer of ethylene and an α,β-ethylenically unsaturated acid selected from the class consisting of acrylic acid and methacrylic acid.
Claim 15
Dependent Claim
43 words
An electrostatic liquid 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 16
Dependent Claim
29 words
An electrostatic liquid developer according to claim 13 wherein the thermoplastic resin is a copolymer of ethylene (89%)/methacrylic acid (11%) having a melt index at 190° C. of 100.
Claim 17
Dependent Claim
23 words
An electrostatic liquid developer according to claim 1 wherein the particles have an average by area particle size of less than 5 μm.
Claim 18
Dependent Claim
15 words
An electrostatic liquid developer according to claim 1 wherein component (C) is Basic Barium Petronate.
References Cited (Backward Citations)
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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) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |