US5124224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner compositions and processes with polyethylenes including a linear crystalline polyethylene
Assignee: Xerox Corp
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Filing: 1991-04-01
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Granted: 1992-06-23
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Expires: 2011-04-01
Abstract
Abstract A process for the preparation of a toner with a melting point of from about 100° to about 130° C. which comprises the addition of a linear crystalline polyethylene with a weight average molecular weight of from about 500 to about 1,200 to a toner comprised of a polyester and pigment.
Inventors
- 👤 John S. Berkes
- 👤 Paul C. Julien
- 👤 Suresh K. Ahuja
- 👤 Che C. Chow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:43
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08704
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
136 words
A process for avoiding toner offsetting and reducing the amount of fuser release oil selected in a xerographic imaging apparatus consisting essentially of adding to said xerographic imaging apparatus containing a layered imaging member a toner with a melting point of from about 100 to about 130° C., which toner consists essentially of a linear polyester, pigment and a charge enhancing additive, and an added linear crystalline polyethylene with a weight average molecular weight of from about 500 to about 1,000, thereby enabling the toner particles to be substantially completely released from a fuser roll present in said xerographic imaging apparatus and wherein the amount of fuser release oil utilized is reduced from about 20 to about 50 microliters for each developed image copy to about 2 to about 3 microliters for each developed image copy.
Claim 2
Dependent Claim
136 words
A process for avoiding toner offsetting and reducing the amount of fuser release oil selected in a xerographic imaging apparatus consisting essentially of adding to said xerographic imaging apparatus containing a layered imaging member a toner with a melting point of from about 100 to about 130° C., which toner consists essentially of a linear polyester, pigment and a charge enhancing additive, and an added linear crystalline polyethylene with a weight average molecular weight of from about 500 to about 1,000, thereby enabling the toner particles to be substantially completely released from a fuser roll present in said xerographic imaging apparatus and wherein the amount of fuser release oil utilized is reduced from about 20 to about 50 microliters for each developed image copy to about 2 to about 3 microliters for each developed image copy.
Claim 3
Dependent Claim
16 words
A process in accordance with claim 1 wherein the polyethylene has a molecular weight of 1,000.
Claim 4
Dependent Claim
18 words
A process in accordance with claim 2 wherein the crystalline polyethylene is uniformly dispersed in the toner composition.
Claim 5
Dependent Claim
22 words
A process in accordance with claim 1 wherein the polyester is a propoxilated bisphenol fumerate, cyclohexanol bisphenol terephthalate, or propylene butylene terephthalate.
Claim 6
Dependent Claim
19 words
A process in accordance with claim 4 wherein the crystalline polyethylene has a molecular weight average of about 1,000.
Claim 7
Dependent Claim
25 words
A process in accordance with claim 1 wherein the crystalline polyethylene is present in an amount of from about 1 to about 10 weight percent.
Claim 8
Dependent Claim
27 words
A process in accordance with claim 1 wherein the addition of the linear crystalline polyethylene is accomplished with mixing, and thereafter the mixture is heated and cooled.
Claim 9
Dependent Claim
17 words
A process in accordance with claim 1 wherein the melting point of the toner is 125° C.
Claim 10
Dependent Claim
15 words
A process in accordance with claim 1 wherein toner offsetting is avoided during image fusing.
Claim 11
Dependent Claim
17 words
A process in accordance with claim 1 wherein the pigment is carbon black, magnetite, or mixtures thereof.
Claim 12
Dependent Claim
17 words
A process in accordance with claim 1 wherein the pigment is cyan, magenta, yellow, or mixtures thereof.
Claim 13
Dependent Claim
18 words
A process in accordance with claim 1 wherein the pigment is red, blue, green, brown, or mixtures thereof.
Claim 14
Dependent Claim
26 words
A process in accordance with claim 1 wherein the toner obtained is subjected to micronization and classification prior to being introduced into said xerographic imaging apparatus.
Claim 15
Dependent Claim
17 words
A process in accordance with claim 1 wherein the toner is subjected to grinding, micronization, and classification.
Claim 16
Dependent Claim
49 words
A process in accordance with claim 1 wherein there results developed images of excellent quality with no fuser roll offset to paper or no fuser roll contamination subsequent to operating the fuser for about 5 hours followed by operation of the fuser roll for about an additional half hour.
Claim 17
Dependent Claim
37 words
A process in accordance with claim 15 wherein the toner selected contains about 71 percent by weight of said linear polyester, 28 weight percent of the pigment magnetite, and 1 weight percent of the charge enhancing additive.
References Cited (Backward Citations)
US3590000A
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US3983045A
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GB1442835A
Cited
US4367275A
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US4912010A
Cited
US4952477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-23 | 1995-12-23 | 1996-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-23 | 1999-12-23 | 2000-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-23 | 2003-12-23 | 2004-06-23 | $7700.00 | Window Closed / Lapsed |