US4634649A
Expired / Lapsed
US
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Developer compositions
Assignee: Xerox Corp
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Filing: 1985-03-20
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Granted: 1987-01-06
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Expires: 2005-03-20
Abstract
Abstract Disclosed is a two-component developer composition enabling smudge resistant images which is comprised of improved two-component contamination free developer composition comprised of (1) magnetite; (2) a polyester resin comprised of the polymeric esterification product of a dicarboxylic acid and a diol comprising a diphenol of the following formula ##STR1## wherein R is selected from substituted and unsubstituted alkylene radicals of from about 2 to about 12 carbon atoms, alkylidene radicals of from 1 to 12 carbon atoms and cycloalkylidene radicals of from 3 to 12 carbon atoms; R' and R" are selected from substituted and unsubstituted alkylene radicals of from 2 to 12 carbon atoms, alkylene arylene radicals of from 8 to 12 carbon atoms and arylene radicals; X and X' are selected from hydrogen or any alkyl radical having from 1 to 4 carbon atoms; and each n is a number of from 0 (zero) to 4; and (3) carrier particles.
Inventors
- 👤 John F. Knapp
- 👤 Robert J. Gruber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:12
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/08755
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
97 words
An improved two-component contamination free developer composition of: a toner having magnetite and a polyester resin comprised of the polymeric esterification product of a dicarboxylic acid or anhydride selected from the group consisting of fumaric and maleic, and a diol comprising a diphenol of the following formula ##STR3## wherein R, R' and R" are the same or different and each is selected from substituted or unsubstituted lower alkyl radicals; and carrier particles; said magnetite being about 15 to about 50 percent, and said polyester resin being about 50 to about 85 percent, by weight of the toner.
Claim 2
Dependent Claim
97 words
An improved two-component contamination free developer composition of: a toner having magnetite and a polyester resin comprised of the polymeric esterification product of a dicarboxylic acid or anhydride selected from the group consisting of fumaric and maleic, and a diol comprising a diphenol of the following formula ##STR3## wherein R, R' and R" are the same or different and each is selected from substituted or unsubstituted lower alkyl radicals; and carrier particles; said magnetite being about 15 to about 50 percent, and said polyester resin being about 50 to about 85 percent, by weight of the toner.
Claim 3
Dependent Claim
52 words
An improved developer composition in accordance with claim 1 wherein the magnetite is present in an amount of from about 20 percent by weight to about 50 percent by weight, and the polyester resin is present in an amount of from about 50 percent by weight to about 80 percent by weight.
Claim 4
Dependent Claim
22 words
A developer composition in accordance with claim 1 wherein the polyester is obtained from the reaction of 2,2-bis(4-hydroxyisopropoxy phenyl)propane and fumaric acid.
Claim 5
Dependent Claim
12 words
A developer composition in accordance with claim 1 further including additive particles.
Claim 6
Dependent Claim
30 words
A developer composition in accordance with claim 4 wherein the additive particles are selected from the group consisting of colloidal silicas, metal salts, and metal salts of a fatty acid.
Claim 7
Dependent Claim
17 words
A developer composition in accordance with claim 5 wherein the fatty acid metal salt is zinc stearate.
Claim 8
Dependent Claim
35 words
A developer composition in accordance with claim 5 wherein the colloidal silica additive particles are present in an amount of from about 0.2 percent by weight to about 0.8 percent by weight of the toner.
Claim 9
Dependent Claim
37 words
A developer composition in accordance with claim 5 wherein the metal salt fatty acid additive particles are present in an amount of from about 0.1 percent by weight to about 0.6 percent by weight of the toner.
Claim 10
Dependent Claim
42 words
A developer composition in accordance with claim 5 wherein the colloidal silica is present in an amount of 0.65 percent by weight, and the metal salt of fatty acid is present in an amount of 0.35 percent by weight of the toner.
Claim 11
Dependent Claim
16 words
A developer composition in accordance with claim 1 wherein the carrier particles contain a coating thereover.
Claim 12
Dependent Claim
29 words
A developer composition in accordance with claim 10 wherein the coating is selected from the group consisting of polymethylmethacrylates, and terpolymers of styrene, methacrylate, and a vinyl triethoxy silane.
Claim 13
Dependent Claim
15 words
A developer composition in accordance with claim 1 further including pigment particles in the toner.
Claim 14
Dependent Claim
15 words
A developer composition in accordance with claim 12 wherein the pigment particles are carbon black.
Claim 15
Dependent Claim
32 words
A developer composition in accordance with claim 12 wherein there is further included additive particles selected from the group consisting of colloidal silicas, metal salts, and metal salts of a fatty acid.
Claim 16
Dependent Claim
17 words
A developer composition in accordance with claim 14 wherein the fatty acid metal salt is zinc stearate.
Claim 17
Dependent Claim
14 words
A developer composition in accordance with claim 10 wherein the carrier core is steel.
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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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |