US4642281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated electrostatographic toner material
Assignee: Fujifilm Holdings Corp
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Filing: 1984-03-23
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Granted: 1987-02-10
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Expires: 2004-03-23
Abstract
Abstract An encapsulated electrostatographic toner material preferably employable in a pressure fixing process and improved in the fixability after storage of the toner material comprising a core and a shell enclosing the core, in which: said core comprises, a polymer, a solvent having a boiling point of not lower than 180° C. which is capable of dissolving the polymer or causing the polymer to swell, a colorant and a particulate magnetizable substance hydrophobically treated or coated on the surface; and said shell is prepared by an in-situ polymerization process such as an inner polymerization process or an outer polymerization process.
Inventors
- 👤 Fujio Kakimi
- 👤 Takeshi Mikami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:27
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/093; G03G9/0935; G03G9/09385; G03G9/09378; G03G9/09392
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
88 words
An encapsulated electrostatographic toner material comprising a core and a shell enclosing the core, in which: said core comprises a polymer, a solvent having a boiling point of not lower than 180° C. selected from the group consisting of phthalic acid esters, phosphoric acid esters, diarylalkanes and alkylnaphthalenes, which is capable of dissolving the polymer or causing the polymer to swell, a colorant and a particulate magnetizable substance hydrophobically treated or coated on the surface; and said shell is prepared by an in-situ inner or outer polymerization process.
Claim 2
Dependent Claim
88 words
An encapsulated electrostatographic toner material comprising a core and a shell enclosing the core, in which: said core comprises a polymer, a solvent having a boiling point of not lower than 180° C. selected from the group consisting of phthalic acid esters, phosphoric acid esters, diarylalkanes and alkylnaphthalenes, which is capable of dissolving the polymer or causing the polymer to swell, a colorant and a particulate magnetizable substance hydrophobically treated or coated on the surface; and said shell is prepared by an in-situ inner or outer polymerization process.
Claim 3
Dependent Claim
45 words
The encapsulated electrostatographic toner material as claimed in claim 1, in which said core further contains an organic liquid having a boiling point in the range of 100° to 250° C. which is substantially incapable of dissolving the polymer or causing the polymer to swell.
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) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |