US4094803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer composition comprising aminolyzed coated carrier
Assignee: Xerox Corp
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Filing: 1976-10-29
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Granted: 1978-06-13
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Expires: 1996-10-29
Abstract
Abstract Electrostatographic developer compositions for use in developing electrostatic latent images wherein the triboelectric charging potential of functional polymers employed in the carrier materials are controlled through chemical alteration by aminolysis of ester functions. The controlled variation of the triboelectric behavior of functional polymers by aminolysis provides a means of attaining optimum triboelectric responses in development systems.
Inventors
- 👤 Harry W. Gibson
- 👤 Wolfgang H. H. Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:58
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1132; G03G9/1133; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
An electrostatographic developer composition comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles having an average particle diameter of between 50 microns and about 1,000 microns, each of said carrier particles comprising a core surrounded by an outer coating of a polymer selected from the group consisting of styrene-alkylmethacrylate and styrene-alkylacrylate, said polymer having been functionalized by ester group aminolysis to produce an aminolyzed polymer having the general structure ##STR4## where X may be NH 2 , OH, and H said carrier particles being characterized as having controlled triboelectric charging properties.
Claim 2
Dependent Claim
94 words
An electrostatographic developer composition comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles having an average particle diameter of between 50 microns and about 1,000 microns, each of said carrier particles comprising a core surrounded by an outer coating of a polymer selected from the group consisting of styrene-alkylmethacrylate and styrene-alkylacrylate, said polymer having been functionalized by ester group aminolysis to produce an aminolyzed polymer having the general structure ##STR4## where X may be NH 2 , OH, and H said carrier particles being characterized as having controlled triboelectric charging properties.
Claim 3
Dependent Claim
31 words
An electrostatographic developer composition in accordance with claim 1 wherein said coating comprises from about 0.1 percent to about 10.0 percent by weight based on the weight of said carrier particles.
Claim 4
Dependent Claim
17 words
An electrostatographic developer composition in accordance with claim 1 wherein said aminolyzed polymer contains hydroxyalkylamide functional groups.
Claim 5
Dependent Claim
35 words
An electrostatographic developer composition in accordance with claim 1 wherein said aminolyzed polymer is the product of aminolysis of the pendant ester functions of said polymer with a diamine and said product contains aminoalkylamide functions.
Claim 6
Dependent Claim
29 words
An electrostatographic developer composition in accordance with claim 1 wherein said aminolyzed polymer is the product of aminolysis of the pendant ester functions of said polymer with an aminoalcohol.
Claim 7
Dependent Claim
17 words
An electrostatographic developer composition in accordance with claim 5 wherein said polymer consists essentially of styrene-n-butyl methacrylate.
Claim 8
Dependent Claim
14 words
An electrostatographic developer composition in accordance with claim 5 wherein said aminoalcohol is 6-aminohexanol.
Claim 9
Dependent Claim
29 words
An electrostatographic developer composition in accordance with claim 5 wherein up to about 25 mole percent of said ester functions of said polymer have been aminolyzed with said aminoalcohol.
Claim 10
Dependent Claim
109 words
An electrostatographic developer composition comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles having an average particle diameter of between about 50 microns and about 1,000 microns, each of said carrier particles comprising a core selected from the group of ferromagnetic materials consisting of iron, steel, ferrite, and nickel, said core being surrounded by an outer coating of a polymer selected from the group consisting of styrene-alkylmethacrylate and styrene-alkylacrylate, said polymer having been functionalized by systematic aminolysis of the pendant ester functions of said polymer with an aminoalcohol resulting in the formation of hydroxyalkylamide functions to provide carrier particles characterized as having controlled triboelectric charging properties.
Claim 11
Dependent Claim
109 words
An electrostatographic developer composition comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles having an average particle diameter of between about 50 microns and about 1,000 microns, each of said carrier particles comprising a core selected from the group of ferromagnetic materials consisting of iron, steel, ferrite, and nickel, said core being surrounded by an outer coating of a polymer selected from the group consisting of styrene-alkylmethacrylate and styrene-alkylacrylate, said polymer having been functionalized by systematic aminolysis of the pendant ester functions of said polymer with an aminoalcohol resulting in the formation of hydroxyalkylamide functions to provide carrier particles characterized as having controlled triboelectric charging properties.
References Cited (Backward Citations)
US3811880A
Cited
US3916065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |