US5658991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner resin composition and a method of manufacturing it, as well as a toner and a method of manufacturing it
Assignee: Sekisui Chemical Co Ltd
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Filing: 1995-07-18
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Granted: 1997-08-19
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Expires: 2015-07-18
Abstract
Abstract A toner resin composition and toner is provided, wherein said toner resin composition comprises a high molecular weight resin having a peak molecular weight of about 100,000-4,000,000, or a gel content of about 20% or more is blended with another resin comprising at least a low molecular weight component (having a peak molecular weight of about 3,000-50,000, making up about 60-95 wt % of the resin weight) and a high molecular weight component (having a peak molecular weight of about 100,000-4,000,000, making up about 5-40 wt % of another resin weight).
Inventors
- 👤 Yoshiyuki Kosaka
- 👤 Takashi Ueyama
- 👤 Tatsuo Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:30
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08706; G03G9/08708; G03G9/08711; G03G9/08784; G03G9/08795; Y; Y10; Y10S; Y10S430/00; Y10S430/166
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
A toner comprising a dry-blended or melt-blended mixture of resins selected from the group consisting of polystyrene, copolymers comprising styrene units and (meth)acrylic ester units, and mixtures thereof, said mixture comprising a first resin of a high molecular weight resin having a peak molecular weight of about 100,000-4,000,000, or a gel content of about 20% or more, and a second polydisperse resin comprising a mixture of at least a low molecular weight component having a peak molecular weight of about 3,000-50,000, making up about 60-95 wt % of the second polydisperse resin and a high molecular weight component having a peak molecular weight of about 100,000-4,000,000, making up about 5-40 wt % of the second polydisperse resin, said toner providing stable images, improved anti-offset properties and superior anti-blocking properties and fixability.
Claim 2
Dependent Claim
131 words
A toner comprising a dry-blended or melt-blended mixture of resins selected from the group consisting of polystyrene, copolymers comprising styrene units and (meth)acrylic ester units, and mixtures thereof, said mixture comprising a first resin of a high molecular weight resin having a peak molecular weight of about 100,000-4,000,000, or a gel content of about 20% or more, and a second polydisperse resin comprising a mixture of at least a low molecular weight component having a peak molecular weight of about 3,000-50,000, making up about 60-95 wt % of the second polydisperse resin and a high molecular weight component having a peak molecular weight of about 100,000-4,000,000, making up about 5-40 wt % of the second polydisperse resin, said toner providing stable images, improved anti-offset properties and superior anti-blocking properties and fixability.
Claim 3
Dependent Claim
12 words
The toner of claim 1, further comprising a coloring agent(s) mixed therewith.
Claim 4
Independent Claim
154 words
A method of manufacturing toner comprising polymerizing monomers selected from the group consisting of styrene monomers, (meth)acrylic ester monomers, and mixtures of styrene monomers with (meth)acrylic ester monomers to produce a low molecular weight polymer having a peak molecular weight of about 3,000-50,000, making up about 60-95 wt % of a second polydisperse resin, and mixing therewith a high molecular weight polymer selected from the group consisting of polystyrene, copolymers comprising styrene units and (meth)acrylic ester units, and mixtures thereof, and having a peak molecular weight of about 100,000-4,000,000, making up about 5-40 wt % of the second polydisperse resin, and then dry-blending or melt-blending the second polydisperse resin with a first resin of a high molecular weight polymer selected from the group consisting of polystyrene, copolymers comprising styrene units and (meth)acrylic ester units, and mixtures thereof, having a peak molecular weight of about 100,000-4,000,000, or a gel content of about 20% or more.
Claim 5
Independent Claim
154 words
A method of manufacturing toner comprising polymerizing monomers selected from the group consisting of styrene monomers, (meth)acrylic ester monomers, and mixtures of styrene monomers with (meth)acrylic ester monomers to produce a low molecular weight polymer having a peak molecular weight of about 3,000-50,000, making up about 60-95 wt % of a second polydisperse resin, and mixing therewith a high molecular weight polymer selected from the group consisting of polystyrene, copolymers comprising styrene units and (meth)acrylic ester units, and mixtures thereof, and having a peak molecular weight of about 100,000-4,000,000, making up about 5-40 wt % of the second polydisperse resin, and then dry-blending or melt-blending the second polydisperse resin with a first resin of a high molecular weight polymer selected from the group consisting of polystyrene, copolymers comprising styrene units and (meth)acrylic ester units, and mixtures thereof, having a peak molecular weight of about 100,000-4,000,000, or a gel content of about 20% or more.
Claim 6
Dependent Claim
20 words
A method of manufacturing toner comprising mixing the toner produced by the method of claim 3, with a coloring agent(s).
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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) | 2000-08-18 | 2001-02-17 | 2001-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-08-18 | 2005-02-17 | 2005-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-08-18 | 2009-02-17 | 2009-08-19 | $7700.00 | Window Closed / Lapsed |