US4812377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High resolution polyester developers for electrostatography
Assignee: Eastman Kodak Co
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Filing: 1988-03-28
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Granted: 1989-03-14
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Expires: 2008-03-28
Abstract
Abstract Dry or liquid developers capable of forming high resolution electrostatographic images are made from finely divided toner particles comprising a fusible branched chain, polyester resin which contains 2,3-dihydro,1,3-dioxo-2-yl-1H-isoindole-ar(-yl or -diyl) groups derived, for example, from a 2,3-dihydro-1,3-dioxo-1H-isoindole-5-carboxylic acid. The toner compositions are brittle and can be ground to very small particle size for high resolution image development; they have good cohesivity and resist toner offset; they are fusible at low temperatures; and, in preferred embodiments, are capable of forming transparent color images.
Inventors
- 👤 John C. Wilson
- 👤 Domenic Santilli
- 👤 Lawrence P. DeMejo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:49
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/132; C; C08; C08G; C08G63/00; C08G63/68; C08G63/685; C08G63/6854; C08G63/688; C08G63/6884; G03G9/087; G03G9/08742; G03G9/08755
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
36 words
An electrostatographic toner composition comprising an amorphous fusible polyester resin, said resin being a branched chain polyester containing 2,3-dihydro-1,3-dioxo-2-yl-1H isoindole-ar(-yl or -diyl) groups in sufficient concentration to make the polyester resin grindable to fine particle size.
Claim 2
Dependent Claim
36 words
An electrostatographic toner composition comprising an amorphous fusible polyester resin, said resin being a branched chain polyester containing 2,3-dihydro-1,3-dioxo-2-yl-1H isoindole-ar(-yl or -diyl) groups in sufficient concentration to make the polyester resin grindable to fine particle size.
Claim 3
Dependent Claim
22 words
A composition according to claim 1 in the form of toner particles having a volume average particle size less than 0.1 micrometer.
Claim 4
Dependent Claim
21 words
A composition according to claim 1 wherein the 2,3-dihydro-1,3-dioxo-2-yl-1H-isoindole-ar(-yl or -diyl) groups are in a chain capping group of the polyester.
Claim 5
Dependent Claim
19 words
A composition according to claim 1 wherein the 2,3-dihydro-1,3-dioxo-2-yl-1H-isoindole-ar(-yl or -diyl) groups are in the backbone of the polyester.
Claim 6
Dependent Claim
16 words
A composition according to claim 1 which also contains a charge control agent and a colorant.
Claim 7
Dependent Claim
19 words
A composition according to claim 3 wherein the 2,3-dihydro-1,3-dioxo-2-yl-1H-isoindole-ar(-yl or -diyl) chain capping groups are of the formula: ##STR19##
Claim 8
Dependent Claim
18 words
A composition according to claim 4 wherein the 2,3-dihydro-1,3-dioxo-2-yl-1H-isoindole-ar(-yl or -diyl) backbone groups are of the formula: ##STR20##
Claim 9
Dependent Claim
48 words
A composition according to claim 1 wherein the polyester is the derivative of at least one aromatic dicarboxylic acid, at least one aliphatic diol, at least one aliphatic triol or tetraol branching agent and of an isoindole compound of the formula: ##STR21## wherein R is hydrogen or carboxyl.
Claim 10
Dependent Claim
38 words
A composition according to claim 1 wherein the polyester comprises components of the formula: ##STR22## wherein R is hydrogen or carboxyl; R' is a single bond or lower alkylene; and R" is a tetravalent lower aliphatic hydrocarbon group.
Claim 11
Dependent Claim
33 words
A composition according to claim 9 wherein the polyester further comprises sulfoisophthalic and aliphatic triol components of the formula: ##STR23## wherein M.sup.⊕ is a cation and R is a trivalent lower aliphatic hydrocarbon.
Claim 12
Dependent Claim
40 words
An electrostatographic developer composition comprising finely divided toner particles of the composition according to claim 1, said particles being admixed with solid carrier particles in a dry developer composition or dispersed in a carrier liquid in a liquid developer composition.
Claim 13
Dependent Claim
29 words
A dry developer composition according to claim 11 wherein the toner particles have a volume average particle size less than 15 micrometers and the carrier particles are magnetic particles.
Claim 14
Dependent Claim
32 words
A liquid developer composition according to claim 11 wherein the toner particles have a volume average particle size less than 0.1 micrometer and are dispersed in a volatile, electrically insulating carrier liquid.
Claim 15
Dependent Claim
22 words
A developer composition according to claim 11 wherein the 2,3-dihydro-1,3-dioxo-2-yl-1H-isoindole-ar(-yl or -diyl) groups are in a chain capping group of the polyester.
Claim 16
Dependent Claim
20 words
A developer composition according to claim 11 wherein the 2,3-dihydro-1,3-dioxo-2-yl-1H-isoindole-ar(-yl or -diyl) groups are in the backbone of the polyester.
Claim 17
Dependent Claim
17 words
A developer composition according to claim 11 wherein the toner particles also contain a charge control agent.
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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) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |