Patent US4758491A successfully refreshed from Google Patents.
US4758491A
Expired / Lapsed
US
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Dry toner and developer composition
Assignee: Eastman Kodak Co
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Filing: 1987-07-06
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Granted: 1988-07-19
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Expires: 2007-07-06
Abstract
Abstract The image transfer properties and other properties of a fusible dry toner composition are improved by blending the binder resin of the toner with a multiphase polyorganosiloxane block or graft condensation copolymer which provides polyorganosiloxane domains of particular size and concentration at the toner particle surfaces.
Inventors
- 👤 Peter S. Alexandrovich
- 👤 Paul A. Hartley
- 👤 Joseph A. Pavlisko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:24
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/61; G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/08773; G03G9/08784; G03G9/08786; G03G9/08788
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
88 words
An electrostatographic toner composition comprising (a) as a major componeont, a fixable binder resin which is free of siloxane segments, and (b) blended therewith as an additive and as a minor component, an organosiloxane multiphase condensation copolymer having a polyorganosiloxane block or graft segment, said polyorganosiloxane segment comprising from about 10 to 80 weight percent of the additive and the amount of said additive being sufficient to provide a blended composition having a surface atomic ratio of silicon to carbon in the range from about 0.005 to 0.5.
Claim 2
Dependent Claim
88 words
An electrostatographic toner composition comprising (a) as a major componeont, a fixable binder resin which is free of siloxane segments, and (b) blended therewith as an additive and as a minor component, an organosiloxane multiphase condensation copolymer having a polyorganosiloxane block or graft segment, said polyorganosiloxane segment comprising from about 10 to 80 weight percent of the additive and the amount of said additive being sufficient to provide a blended composition having a surface atomic ratio of silicon to carbon in the range from about 0.005 to 0.5.
Claim 3
Dependent Claim
23 words
A composition according to claim 1, wherein the polyorganosiloxane component has polyorganosiloxane domains having maximum diameters of from about 10 to 3,000 nm.
Claim 4
Dependent Claim
31 words
A composition according to claim 2, wherein the amount of said additive (b) is from about 0.5 to 12 parts by weight per hundred parts of the fusible binder resin (a).
Claim 5
Dependent Claim
49 words
A composition according to claim 3, wherein the condensation polymer segment of the multiphase copolymer has a glass transition temperature (Tg) in the range from about 0° to 150° C. and the polyorganosiloxane segment has a glass transition temperature (Tg) in the range from about -130° to 0° C.
Claim 6
Dependent Claim
14 words
A composition according to claim 1, wherein the condensation polymer segment comprises a polyester.
Claim 7
Dependent Claim
14 words
A composition according to claim 1, wherein the condensation polymer segment comprises a polyurethane.
Claim 8
Dependent Claim
12 words
A composition according to claim 6, wherein the polyurethane is a polyesterurethane.
Claim 9
Dependent Claim
14 words
A composition according to claim 1, wherein the polyorganosiloxane segment is a polydimethylsiloxane segment.
Claim 10
Dependent Claim
16 words
A composition according to claim 8, wherein the polyorganosiloxane segment is derived from an α,ω-bis(aminopropyl)polydimethylsiloxane oligomer.
Claim 11
Dependent Claim
14 words
A composition according to claim 1, wherein the binder resin is a thermoplastic polyester.
Claim 12
Dependent Claim
18 words
An electrophotographic developer composition comprising a mixture of magnetic arrier particles and a toner composition of claim 1.
Claim 13
Dependent Claim
18 words
An electrophotographic developer composition comprising a mixture of resin-coated ferrite particles and a toner composition of claim 9.
Claim 14
Dependent Claim
48 words
An electrophotographic developer composition comprising a mixture of magnetic carrier particles and a toner of claim 4, wherein the binder resin is a polyester and the additive is of number average molecular weight from about 10,000 to 200,000 and comprises from about 20 to 60 weight percent polydimethylsiloxane.
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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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |