Patent US5077170A successfully refreshed from Google Patents.
US5077170A
Expired / Lapsed
US
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Toner composition
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1989-11-30
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Granted: 1991-12-31
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Expires: 2009-11-30
Abstract
Abstract Disclosed is a toner composition comprising a toner having electroscopic and fixing properties and fine particles of an acrylic polymer, wherein the fine particles of the acrylic polymer are hydrophobic spherical particles having a particle size of 0.05 to 1 μm, which are obtained by dispersion polymerization of an acrylic monomer in a non-aqueous medium. This toner composition is capable of maintaining good developing property and cleaning property for a long time even in a high-temperature and high-humidity condition and has good flowability and blocking resistance. These properties are further improved by incorporating fine particles of silica, especially hydrophobic silica, into this toner composition.
Inventors
- 👤 Masami Tsujihiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:34
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08726; G03G9/08728; G03G9/08737; G03G9/08775; G03G9/08779; G03G9/097; G03G9/09708; G03G9/09725
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
A toner composition comprising a toner having electroscopic and fixing properties and fine particles of an acrylic polymer, wherein the fine particles of the acrylic polymer are hydrophobic spherical particles having a particle size of 0.05 to 1 μm, which are obtained by dispersion polymerization of an acrylic monomer in a non-aqueous medium.
Claim 2
Dependent Claim
53 words
A toner composition comprising a toner having electroscopic and fixing properties and fine particles of an acrylic polymer, wherein the fine particles of the acrylic polymer are hydrophobic spherical particles having a particle size of 0.05 to 1 μm, which are obtained by dispersion polymerization of an acrylic monomer in a non-aqueous medium.
Claim 3
Dependent Claim
56 words
A toner composition as set forth in claim 1, wherein the fine particles of the acrylic polymer are those obtained by dispersion-polymerizing an acrylic acid ester or a methacrylic acid ester in a saturated hydrocarbon solvent in the presence of a synthetic rubber or natural rubber as a dispersion stabilizer and an oil-soluble radical polymerization initiator.
Claim 4
Dependent Claim
37 words
A toner composition as set forth in claim 1, wherein the fine particles of the acrylic polymer are present in an amount of 0.01 to 1 part by weigh per 100 parts by weight of the toner.
Claim 5
Dependent Claim
30 words
A toner composition as set forth in claim 1, wherein the fine particles of the acrylic polymer are present in the state adhering to the peripheries of the toner particles.
Claim 6
Dependent Claim
57 words
A toner composition comprising a toner having electroscopic and fixing properties, fine particles of an acrylic polymer and fine particles of silica, wherein the fine particles of the acrylic polymer are hydrophobic spherical particles having a particle size of 0.05 to 1 μm, which are obtained by dispersion polymerization of an acrylic monomer in a non-aqueous medium.
Claim 7
Dependent Claim
57 words
A toner composition comprising a toner having electroscopic and fixing properties, fine particles of an acrylic polymer and fine particles of silica, wherein the fine particles of the acrylic polymer are hydrophobic spherical particles having a particle size of 0.05 to 1 μm, which are obtained by dispersion polymerization of an acrylic monomer in a non-aqueous medium.
Claim 8
Dependent Claim
67 words
A toner composition as set forth in claim 5, wherein the fine particles of the acrylic polymer are present in an amount of 0.01 to 1 part by weight per 100 parts by weight of the toner and the fine particles of silica are present in an amount of 1 to 5 parts by weight per part by weight of the fine particles of the acrylic polymer.
Claim 9
Dependent Claim
30 words
A toner composition as set forth in claim 5, wherein the fine particles of silica are composed of hydrophobic silica having a primary particle size of 0.01 to 0.04 μm.
Claim 10
Dependent Claim
45 words
A toner composition as set forth in claim 1, wherein the fine particles of the acrylic polymer are those obtained by dispersion polymerizing acrylic acid in n-hexane, in the presence of butadiene rubber as a dispersion stabilizer and azobisisobutyronitrile as the oil-soluble radical polymerization initiator.
Claim 11
Dependent Claim
40 words
A toner composition as set forth in claim 5, wherein the fine particles of the silica are present in an amount of 2.5 to 3.5 parts by weight per part by weight of the fine particles of the acrylic polymer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |