Patent US4394430A successfully refreshed from Google Patents.
US4394430A
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Electrophotographic dry toner and developer compositions
Assignee: Eastman Kodak Co
•
Filing: 1981-04-14
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Granted: 1983-07-19
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Expires: 2001-04-14
Abstract
Abstract Alkyldimethylbenzylammonium salts are employed as charge control agents for fusible dry electrophotographic toners.
Inventors
- 👤 Thomas A. Jadwin
- 👤 Robert C. Storey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:29
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/09741; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A two-component electrophotographic developer comprising magnetic carrier particles and a dry particulate electrophotographic toner comprising a major amount of binder polymer and dispersed therein as a charge control agent in an amount of 0.01 to 3 weight percent of the particulate toner, a quaternary ammonium salt of the formula: ##STR3## wherein R is alkyl of 12 to 24 carbon atoms and X.sup.⊖ is an anion.
Claim 2
Dependent Claim
65 words
A two-component electrophotographic developer comprising magnetic carrier particles and a dry particulate electrophotographic toner comprising a major amount of binder polymer and dispersed therein as a charge control agent in an amount of 0.01 to 3 weight percent of the particulate toner, a quaternary ammonium salt of the formula: ##STR3## wherein R is alkyl of 12 to 24 carbon atoms and X.sup.⊖ is an anion.
Claim 3
Dependent Claim
48 words
A developer according to claim 1 wherein the binder polymer also has a colorant dispersed therein and R is straight chain alkyl of 16 to 20 carbon atoms and X - is a halogen ion, an alkyl sulfate ion, an alkyl sulfonate ion or an aryl sulfonate ion.
Claim 4
Dependent Claim
17 words
A developer according to claim 2 wherein R is octadecyl and X - is a chlorine ion.
Claim 5
Dependent Claim
14 words
A developer according to claim 2 wherein the binder polymer is a styrene-acrylic copolymer.
Claim 6
Dependent Claim
24 words
A developer according to claim 4 wherein the binder polymer is an emulsion polymerized, covalently cross-linked, styrene-butylacrylate copolymer and the colorant is carbon black.
Claim 7
Dependent Claim
37 words
A developer according to claim 5 wherein the toner contains 0.05 to 2 parts by weight of said quaternary ammonium salt and from 2 to 8 parts by weight of carbon black per hundred parts of polymer.
Claim 8
Dependent Claim
24 words
An electrophotographic developer according to claim 6 comprising a mixture of ferromagnetic carrier particles partially coated with a fluorocarbon polymer and said particulate toner.
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) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |