US4943505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer and toner composition produced by emulsion polymerization
Assignee: Fujifilm Business Innovation Corp
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Filing: 1985-03-06
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Granted: 1990-07-24
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Expires: 2005-03-06
Abstract
Abstract A developer for an electrostatic latent image is described, which comprises a toner powder and a fine powder having a particle size smaller than that of the toner powder, said fine powder being made of a polymer obtained by soap-free emulsion polymerization.
Inventors
- 👤 Takayoshi Aoki
- 👤 Yukihiro Ishii
- 👤 Koichi Tanaka
- 👤 Shigeru Sadamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:45
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/087; G03G9/08702
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
112 words
A toner composition comprising a toner powder and a fine powder having a particle size of from 0.05 to 5 μm and which is smaller than that of the toner powder, wherein said fine powder is present in an amount of from 0.01 to 10 wt % of the toner powder and is made of a polymer obtained by emulsion polymerization of a hydrophilic monomer using a persulfate salt type initiator in the absence of an emulsifier wherein said hydrophilic monomer is selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, acrylic acid, methacrylic acid, vinyl acetate, and acrylonitrile.
Claim 2
Dependent Claim
112 words
A toner composition comprising a toner powder and a fine powder having a particle size of from 0.05 to 5 μm and which is smaller than that of the toner powder, wherein said fine powder is present in an amount of from 0.01 to 10 wt % of the toner powder and is made of a polymer obtained by emulsion polymerization of a hydrophilic monomer using a persulfate salt type initiator in the absence of an emulsifier wherein said hydrophilic monomer is selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, acrylic acid, methacrylic acid, vinyl acetate, and acrylonitrile.
Claim 3
Dependent Claim
15 words
A toner composition according to claim 1, wherein said fine powder comprises substantially spherical particles.
Claim 4
Dependent Claim
23 words
A toner composition according to claim 1, wherein the particle size of the fine powder ranges from 0.1 to 2 μm in size.
Claim 5
Dependent Claim
113 words
A developer comprising carrier particles, a toner powder and a fine powder having a particle size of from 0.05 to 5 μm and which is smaller than that of the toner powder, wherein said fine powder is present in an amount of from 0.01 to 10 wt % of the toner powder and is made of a polymer obtained by emulsion polymerization of a hydrophilic monomer using a persulfate salt type initiator in the absence of an emulsifier wherein said hydrophilic monomer is selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, acrylic acid, methacrylic acid, vinyl acetate, and acrylonitrile.
Claim 6
Dependent Claim
113 words
A developer comprising carrier particles, a toner powder and a fine powder having a particle size of from 0.05 to 5 μm and which is smaller than that of the toner powder, wherein said fine powder is present in an amount of from 0.01 to 10 wt % of the toner powder and is made of a polymer obtained by emulsion polymerization of a hydrophilic monomer using a persulfate salt type initiator in the absence of an emulsifier wherein said hydrophilic monomer is selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, acrylic acid, methacrylic acid, vinyl acetate, and acrylonitrile.
Claim 7
Dependent Claim
21 words
A developer according to claim 4, wherein each of said carrier particles consists of a core material and a surface coat.
Claim 8
Dependent Claim
23 words
A toner composition according to claim 1, wherein the emulsion polymerization is carried out in the presence of a water-soluble polymer or oligomer.
Claim 9
Dependent Claim
21 words
A toner composition according to claim 3, wherein the particle size of the fine powder ranges from 0.1 to 0.5 μm.
Claim 10
Dependent Claim
25 words
A toner composition according to claim 1, wherein the amount of the fine powder is from 0.05 to 2.0 wt % of the toner powder.
Claim 11
Dependent Claim
21 words
A toner composition according to claim 1, wherein the toner powder has an average size of from 3 to 20 μm.
Claim 12
Dependent Claim
17 words
A toner composition according to claim 1, wherein said hydrophilic monomer is dispersed in an aqueous medium.
Claim 13
Dependent Claim
19 words
A toner composition according to claim 1, wherein said persulfate salt type initiator is potassium persulfate or sodium thiosulfate.
Claim 14
Dependent Claim
16 words
A toner composition according to claim 6, wherein said water-soluble polymer or oligomer is polyvinyl alcohol.
References Cited (Backward Citations)
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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) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |