US4507377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-fixing liquid electrographic developers
Assignee: Eastman Kodak Co
•
Filing: 1972-04-08
•
Granted: 1985-03-26
•
Expires: 1992-04-08
Abstract
Abstract A liquid electrostatic image developer is disclosed which forms self-fixing images on an electrostatic image-bearing surface which may be the image-forming surface. The developer comprises a plurality of particles composed of a compatible blend of at least one polyester resin and at least one polyester plasticizer. The plasticizer contains essentially no curable groups and is insoluble in the liquid carrier. Furthermore, images from certain preferred developers containing dispersed colorants are crack-resistant in addition to self-fixing.
Inventors
- 👤 Peter S. Alexandrovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:42
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/132
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
67 words
A liquid electrostatic image developer composition comprising an electrically insulating organic carrier liquid containing, as a dispersed constituent, a plurality of toner particles comprising a compatible blend of at least one polyester resin and at least one polyester plasticizer, characterized in that the plasticizer has a glass transition temperature below -40° C. and is substantially free from curable groups and is substantially insoluble in the carrier liquid.
Claim 2
Dependent Claim
67 words
A liquid electrostatic image developer composition comprising an electrically insulating organic carrier liquid containing, as a dispersed constituent, a plurality of toner particles comprising a compatible blend of at least one polyester resin and at least one polyester plasticizer, characterized in that the plasticizer has a glass transition temperature below -40° C. and is substantially free from curable groups and is substantially insoluble in the carrier liquid.
Claim 3
Dependent Claim
21 words
A developer according to claim 1 characterised in that the polyester resin is a polyester ionomer having ionic diacid recurring units.
Claim 4
Dependent Claim
23 words
A developer according to claim 1 or 2 characterised in that the polyester has a glass transition temperature of at least 40° C.
Claim 5
Dependent Claim
43 words
A developer according to claims 1, 2 or 3 characterized in that the polyester plasticizer comprises diol recurring units derived from alkylene diols having 2 to 6 carbon atoms and diacid recurring units derived from aliphatic diacids having 3 to 10 carbon atoms.
Claim 6
Dependent Claim
20 words
A developer according to claim 4 characterised in that the polyester plasticizer comprises butylene diol units and adipic acid units.
Claim 7
Dependent Claim
26 words
A developer according to any of the preceding claims characterised in that the weight ratio of polyester plasticizer to polyester resin is from 0.2 to 1.
Claim 8
Dependent Claim
23 words
A developer according to claim 6 characterised in that the weight ratio of polyester plasticizer to polyester resin is from 0.25 to 0.5.
Claim 9
Dependent Claim
18 words
A developer according to any of the preceding claims characterised in that the toner particles contain a colorant.
Claim 10
Dependent Claim
14 words
A developer according to claim 8 characterised in that the colorant is carbon black.
Claim 11
Dependent Claim
18 words
A developer according to any of the preceding claims characterised in that it contains a charge control agent.
Claim 12
Dependent Claim
43 words
A developer according to claim 10 characterized in that the charge-control agent is a poly(styrene-co-lauryl methacrylate-co-sulphoethyl methacrylate), poly(vinyl-tolueneco-lauryl methacrylate-co-lithium methacrylate-co-methacrylic acid), poly(styrene-co-lauryl methacrylate-co-lithium sulphoethyl methacrylate), poly(vinyltoluene-co-lauryl methacrylate-co-lithium methacrylate), poly(styrene-co-lauryl methacrylate-co-lithium methacrylate), poly(t-butylstyrene-co-lauryl methacrylate-co-lithium methacrylate), poly(t-butylstyrene-co-lithium methacrylate) or poly(vinyl toluene-co-lauryl methacrylate-co-methacryloyloxyethyl trimethylammonium p-toluene sulphonate).
Claim 13
Dependent Claim
33 words
A developer according to claim 10 or 11 characterised in that the charge control agent is present in a range from 0.01 to 10 percent by weight based on the weight of developer.
Claim 14
Dependent Claim
21 words
A developer according to any of the claims 1 to 12 characterised in that the carrier liquid is an isoparaffinic hydrocarbon.
Claim 15
Independent Claim
39 words
The method of forming a toner image comprising treating a surface bearing an electrostatic charge image with a liquid electrostatic image developer characterised in that the electrostatic image developer is one of those claimed in claims 1 to 13.
Claim 16
Dependent Claim
13 words
A toner image bearing surface whenever made by the method of claim 14.
References Cited (Backward Citations)
GB897903A
Cited
GB1110225A
Cited
US3939085A
Cited
DE2313547A1
Cited
US3954640A
Cited
US4052325A
Cited
US4202785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |