US4520091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated electrostatographic toner material
Assignee: Fujifilm Holdings Corp
•
Filing: 1984-03-23
•
Granted: 1985-05-28
•
Expires: 2004-03-23
Abstract
Abstract An encapsulated electrostatographic toner material comprising a core and a shell enclosing the core, in which said core comprises: a colorant; a polymer; a solvent having a boiling point of not lower than 180° C. which is capable of dissolving the polymer of causing the polymer to swell; and 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.
Inventors
- 👤 Fujio Kakimi
- 👤 Takeshi Mikami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:56
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/093; G03G9/0935; G03G9/09378; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2989
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
78 words
An encapsulated electrostatographic toner material comprising a core and a shell enclosing the core, in which said core comprises a colorant, 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, and 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.
Claim 2
Dependent Claim
78 words
An encapsulated electrostatographic toner material comprising a core and a shell enclosing the core, in which said core comprises a colorant, 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, and 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.
Claim 3
Dependent Claim
38 words
The encapsulated electrostatographic toner material as claimed in claim 1, in which said polymer is selected from the group consisting of homopolymers and copolymers of acrylic acid esters, homopolymers and copolymers of methacrylic acid esters, and styrene-butadiene copolymer.
Claim 4
Dependent Claim
40 words
The encapsulated electrostatographic toner material as claimed in claim 1, in which the solvent having a boiling point of not lower than 180° C. is selected from the group consisting of phthalic acid esters, phosphoric acid esters, alkylnaphthalenes, and diarylalkanes.
Claim 5
Dependent Claim
49 words
The encapsulated electrostatographic toner material as claimed in claim 1, in which said organic liquid having a boiling point in the range of 100° to 250° C. is selected from the group consisting of aliphatic saturated hydrocarbon and organic liquid mixtures containing as main component an aliphatic saturated hydrocarbon.
Claim 6
Dependent Claim
40 words
The encapsulated electrostatographic toner material as claimed in any one of claims 1 to 4, in which said shell comprises at least one resin selected from the group consisting of a polyurethane resin, a polyurea resin and a polyamide resin.
Claim 7
Dependent Claim
46 words
The encapsulated electrostatographic toner material as claimed in any one of claims 1 to 4, in which said shell is composed of a complex layer comprising at least two resins selected from the group consisting of a polyurethane resin, a polyurea resin and a polyamide resin.
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) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |