US4734352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyhydroxy charging adjuvants for liquid electrostatic developers
Assignee: EIDP Inc
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Filing: 1986-04-22
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Granted: 1988-03-29
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Expires: 2006-04-22
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 or zwitterionic compound, and (D) a polyhydroxy compound, preferably soluble in the developer in an amount of at least 2% by weight. 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
2026-10-25 14:45
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/135
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
56 words
An 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 or zwitterionic compound, and (D) a polyhydroxy compound.
Claim 2
Dependent Claim
56 words
An 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 or zwitterionic compound, and (D) a polyhydroxy compound.
Claim 3
Dependent Claim
26 words
An electrostatic liquid developer according to claim 1 wherein the polyhydroxy compound is soluble in the developer in an amount of at least 2% by weight.
Claim 4
Dependent Claim
61 words
An electrostatic liquid developer according to claim 1 wherein component (A) is present in 79 to 99.7% by weight, component (B) is present in 0.28 to 15.0% by weight, component (C) is present in 0.01 to 1.0% by weight, and component (D) is present 0.01 to 5.0% by weight, all weight percentages being based on the total weight of the developer.
Claim 5
Dependent Claim
18 words
An electrostatic liquid developer according to claim 1 containing up to about 60% by weight of a colorant.
Claim 6
Dependent Claim
14 words
An electrostatic liquid developer according to claim 4 wherein the colorant is a pigment.
Claim 7
Dependent Claim
22 words
An electrostatic liquid 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
An electrostatic liquid developer according to claim 4 wherein the colorant is a dye.
Claim 9
Dependent Claim
16 words
An electrostatic liquid developer according to claim 1 wherein a fine particle size oxide is present.
Claim 10
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 group consisting of acrylic acid and methacrylic acid.
Claim 11
Dependent Claim
18 words
An electrostatic liquid developer according to claim 1 wherein the thermoplastic resin is an ethylene vinyl acetate copolymer.
Claim 12
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 13
Dependent Claim
29 words
An electrostatic liquid 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
An electrostatic liquid developer according to claim 1 wherein the particles have an average by area particle size of less than 5 μm.
Claim 15
Dependent Claim
14 words
An electrostatic liquid developer according to claim 1 wherein component (C) is barium petronate.
Claim 16
Dependent Claim
13 words
An electrostatic liquid developer according to claim 1 wherein component (C) is lecithin.
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) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |