US4535049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-fixing toner for electrophotography and process for preparation thereof
Assignee: Kyocera Mita Industrial Co Ltd
•
Filing: 1983-08-02
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Granted: 1985-08-13
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Expires: 2003-08-02
Abstract
Abstract Disclosed is a pressure-fixing toner for the electrophotography, which comprises electroscopic particles having an indeterminate shape and comprising as a pressure-fixing binder component a composite binder component comprising a wax component and a resin component composed mainly of a styrene-acrylic copolymer at a weight ratio of from 54/46 to 20/80, wherein the wax component is present in the form of spherical particles having a particle size smaller than 10 microns in a continuous phase of the resin component.
Inventors
- 👤 Nobuyasu Honda
- 👤 Toshiro Yamakawa
- 👤 Toshimitsu Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:48
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0802; G03G9/0804; G03G9/0806; G03G9/081; G03G9/087; G03G9/08702; G03G9/08706; G03G9/08708; G03G9/08711; G03G9/08775; G03G9/08782
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
152 words
A process for the preparation of pressure-fixing toners for the electrophotography, which comprises the step of cooling a solution obtained by hot-dissolving a wax component in an aromatic solvent to precipitate spherical particles of the wax component having a particle size smaller than 10 microns and copolymerizing a styrene type monomer with an acrylic monomer in the system containing the spherical particles of the wax component to form a composite binder comprising the wax component and the resin component composed mainly of the resulting styrene-acrylic copolymer at a weight ratio of from 54/46 to 20/80, in which the wax component is present in the form of spherical particles having a particle size smaller than 10 microns in a continuous phase of the resin component, and the step of kneading the composite binder with a pigment, and cooling and pulverizing the kneaded composite binder and pigment to form particles having an indeterminate shape.
Claim 2
Dependent Claim
152 words
A process for the preparation of pressure-fixing toners for the electrophotography, which comprises the step of cooling a solution obtained by hot-dissolving a wax component in an aromatic solvent to precipitate spherical particles of the wax component having a particle size smaller than 10 microns and copolymerizing a styrene type monomer with an acrylic monomer in the system containing the spherical particles of the wax component to form a composite binder comprising the wax component and the resin component composed mainly of the resulting styrene-acrylic copolymer at a weight ratio of from 54/46 to 20/80, in which the wax component is present in the form of spherical particles having a particle size smaller than 10 microns in a continuous phase of the resin component, and the step of kneading the composite binder with a pigment, and cooling and pulverizing the kneaded composite binder and pigment to form particles having an indeterminate shape.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein said pigment is selected from the group consisting of coloring pigments, extender pigments, magnetic pigments and mixtures thereof.
Claim 4
Dependent Claim
33 words
The process of claim 1 wherein said pigment comprises a coloring pigment selected from the group consisting of black pigments, yellow pigments, orange pigments, red pigments, violet pigments, blue pigments and green pigments.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein said pigment comprises carbon black.
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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) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |