US4318974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolycarbonate materials for flash fusing toners
Assignee: Xerox Corp
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Filing: 1980-10-06
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Granted: 1982-03-09
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Expires: 2000-10-06
Abstract
Abstract Disclosed is an improved toner composition comprised of a colorant and a copolycarbonate resin, which toner has an intrinsic viscosity of from about 0.10 to about 0.6 dl/gr. (deciliters per gram) a melt flow temperature (T f ) of from about 70° C. to about 125° C., a flash fusing energy of from about 3 J/in. 2 to about 8 J/in. 2 , (Joules per inch squared), and a glass transition temperature of from about 50° C. to about 65° C.
Inventors
- 👤 Thomas J. Pacansky
- 👤 Robert J. Gruber
- 👤 John F. Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:33
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/08757
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
An improved developer composition useful in imaging systems employing flash fusing comprised of toner particles, and carrier particles, wherein the toner particles consist of a poly-(4,4'-isopropylidene diphenylene oxdiethylene carbonate), and carbon black, and the carrier particles consist of steel, said toner particles possessing an intrinsic viscosity of from about 0.10 to about 0.6 deciliters per gram, a melt flow temperature from 70° C. to about 125° C., a flash fusing energy of from about 3 joules/inch 2 , to 8 joules/inch 2 , and a glass transition temperature of 59° C.
Claim 2
Dependent Claim
91 words
An improved developer composition useful in imaging systems employing flash fusing comprised of toner particles, and carrier particles, wherein the toner particles consist of a poly-(4,4'-isopropylidene diphenylene oxdiethylene carbonate), and carbon black, and the carrier particles consist of steel, said toner particles possessing an intrinsic viscosity of from about 0.10 to about 0.6 deciliters per gram, a melt flow temperature from 70° C. to about 125° C., a flash fusing energy of from about 3 joules/inch 2 , to 8 joules/inch 2 , and a glass transition temperature of 59° C.
Claim 3
Dependent Claim
100 words
An improved developer composition, useful in imaging systems employing flash fusing comprised of toner particles and carrier particles, wherein toner particles consist of a blend of poly-(4,4'-isopropylidene diphenylene oxydiethylene carbonate), 60 percent by weight, and poly-(4,4'-isopropylidene diphenylene oxytriethylene carbonate), 40 percent by weight, and the carrier consists of steel, said toner particles possessing an intrinsic viscosity of from 0.10 to 0.6 deciliters per gram, a melt flow temperature of from about 70° C. to about 125° C., a flash fusing energy of from about 3 joules/inch 2 to about 8 joules/inch 2 and a glass transition temperature of 58° C.
Claim 4
Dependent Claim
100 words
An improved developer composition, useful in imaging systems employing flash fusing comprised of toner particles and carrier particles, wherein toner particles consist of a blend of poly-(4,4'-isopropylidene diphenylene oxydiethylene carbonate), 60 percent by weight, and poly-(4,4'-isopropylidene diphenylene oxytriethylene carbonate), 40 percent by weight, and the carrier consists of steel, said toner particles possessing an intrinsic viscosity of from 0.10 to 0.6 deciliters per gram, a melt flow temperature of from about 70° C. to about 125° C., a flash fusing energy of from about 3 joules/inch 2 to about 8 joules/inch 2 and a glass transition temperature of 58° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-08 | 1985-09-07 | 1986-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-08 | 1989-09-07 | 1990-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-08 | 1993-09-07 | 1994-03-09 | $7700.00 | Window Closed / Lapsed |