Patent US4465756A successfully refreshed from Google Patents.
US4465756A
Expired / Lapsed
US
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Electrostatographic enscapsulated toner material improved in chargeability
Assignee: Fujifilm Holdings Corp
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Filing: 1982-09-30
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Granted: 1984-08-14
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Expires: 2002-09-30
Abstract
Abstract An electrostatographic toner material suitably employable for the pressure fixing process, which comprises encapsulated toner particles having an average particle size in the range from about 0.5 to 1,000 microns, in which the toner particle comprises a pressure fixable adhesive core material containing a colorant and a pressure rupturable shell enclosing the core material, the outer surface of the shell being provided with a surface active agent having the following hydrophobic group: ##STR1## in which R 1 and R 2 are the same or different, and each is an aliphatic hydrocarbon group of 2-20 carbon atoms or an aromatic hydrocarbon group of 6-20 carbon atoms.
Inventors
- 👤 Takeshi Mikami
- 👤 Noriyuki Hosoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:38
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/093; G03G9/09307; G03G9/09314; G03G9/09328; G03G9/09335; G03G9/0935; G03G9/09378; G03G9/097; G03G9/09733; G03G9/09775
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
104 words
An electrostatographic toner material for a pressure fixing process comprising powdery encapsulated toner particles having an average particle size in the range from about 0.5 to about 1,000 microns, in which the toner particle comprises a pressure fixable adhesive core material containing a colorant and a pressure rupturable shell enclosing the core material, the outer surface of the shell being provided with a surface active agent having the following hydrophobic group: ##STR3## in which R 1 and R 2 are the same or different, and each is an aliphatic hydrocarbon group of 2-20 carbon atoms or an aromatic hydrocarbon group of 6-20 carbon atoms.
Claim 2
Dependent Claim
104 words
An electrostatographic toner material for a pressure fixing process comprising powdery encapsulated toner particles having an average particle size in the range from about 0.5 to about 1,000 microns, in which the toner particle comprises a pressure fixable adhesive core material containing a colorant and a pressure rupturable shell enclosing the core material, the outer surface of the shell being provided with a surface active agent having the following hydrophobic group: ##STR3## in which R 1 and R 2 are the same or different, and each is an aliphatic hydrocarbon group of 2-20 carbon atoms or an aromatic hydrocarbon group of 6-20 carbon atoms.
Claim 3
Dependent Claim
36 words
The electrostatographic toner material as claimed in claim 1, in which each of R 1 and R 2 is an aliphatic hydrocarbon group of 4-12 carbon atoms or an aromatic hydrocarbon group of 6-12 carbon atoms.
Claim 4
Dependent Claim
27 words
The electrostatographic toner material as claimed in claim 2, in which each of R 1 and R 2 is an aliphatic hydrocarbon group of 6-10 carbon atoms.
Claim 5
Dependent Claim
37 words
The electrostatographic toner material as claimed in claim 1, in which the surface active agent contains at least one hydrophilic group selected from the group consisting of sulfonate, carboxylate, phosphate, amine, quaternary ammonium salt and pyridinium salt.
Claim 6
Dependent Claim
22 words
The electrostatographic toner material as claimed in claim 4, in which the surface active agent contains at least one hydrophilic sulfonate group.
Claim 7
Dependent Claim
28 words
The electrostatographic toner material as claimed in claim 1, in which the shell is made of a polymer selected from the group consisting of polyurethane, polyurea and polythiourethane.
Claim 8
Dependent Claim
25 words
The electrostatographic toner material as claimed in claim 6, in which the shell is made substantially of a polycondensation product of polyisocyanate, polyol and water.
Claim 9
Dependent Claim
25 words
The electrostatographic toner material as claimed in claim 6, in which the shell is made substantially of a polycondensation product of polyisocyanate, polyol and polyamine.
Claim 10
Dependent Claim
31 words
The electrostatographic toner material as claimed in claim 1, in which the shell is composed substantially of a double layer comprising a polyurethane, polyurea and/or polythiourethane layer and a polyamide layer.
Claim 11
Dependent Claim
30 words
The electrostatographic toner material as claimed in claim 1, in which the pressure fixable adhesive core material is a liquid medium boiling at a temperature of higher than 180° C.
Claim 12
Dependent Claim
22 words
The electrostatographic toner material as claimed in claim 1, in which a flow lubricant is provided onto the surface of the shell.
References Cited (Backward Citations)
US3431412A
Cited
US4259428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |