US5169739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid developer for image fixing method using heat application rollers
Assignee: Ricoh Co Ltd
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Filing: 1990-02-13
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Granted: 1992-12-08
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Expires: 2010-02-13
Abstract
Abstract A liquid developer comprises an aliphatic hydrocarbon carrier liquid and a toner dispersed in the carrier liquid, which toner comprises a coloring agent and a resin component, wherein a solid toner component which is obtained by evaporating the liquid developer to dryness has a softening point of 60° C. to 90° C. and flow-initiating point of 110° C. to 160° C.
Inventors
- 👤 Kazuhiko Umemura
- 👤 Kazuo Tsubuko
- 👤 Shinichi Kuramoto
- 👤 Toshihiko Takahashi
- 👤 Hidemi Uematsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:52
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G11/00; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
A liquid developer for use in an image fixing method in which the surface of a toner-image-bearing sheet is brought into direct contact with a heat-application roller, comprising an aliphatic hydrocarbon carrier liquid and a toner dispersed in said carrier liquid, said toner comprising a coloring agent a resin component, wherein a solid toner component which is obtained by evaporating said liquid developer to dryness has a softening point of 60° C. to 90° C and a flow-initiating point of 110° C. to 160° C.
Claim 2
Dependent Claim
85 words
A liquid developer for use in an image fixing method in which the surface of a toner-image-bearing sheet is brought into direct contact with a heat-application roller, comprising an aliphatic hydrocarbon carrier liquid and a toner dispersed in said carrier liquid, said toner comprising a coloring agent a resin component, wherein a solid toner component which is obtained by evaporating said liquid developer to dryness has a softening point of 60° C. to 90° C and a flow-initiating point of 110° C. to 160° C.
Claim 3
Dependent Claim
33 words
The liquid developer as claimed in claim 1, wherein said aliphatic hydrocarbon carrier liquid is selected from the group consisting of cyclohexanone, n-hexane, n-heptane, n-nonane, n-octane, isooctane, isodecane, ligroin and a mixture thereof.
Claim 4
Dependent Claim
18 words
The liquid developer as claimed in claim 1, wherein said coloring agent is treated by a modified polyolefin.
Claim 5
Dependent Claim
108 words
The liquid developer as claimed in claim 3, wherein said modified polyolefin is selected from the group consisting of polyethylene oxide, polypropylene oxide, ethylene - methacrylic acid copolymer (molar ratio of 70:30), ethylene - methacrylic acid ester (molar ratio of 85:15), propylene - methacrylic acid copolymer (molar ratio of 80:20), propylene - methacrylic acid ester copolymer (molar ratio of 80:20), ethylene - acrylic acid copolymer (molar ratio of 70:30), ethylene - acrylic acid ester (molar ratio of 85:15), propylene - acrylic acid copolymer (molar ratio of 80:20), propylene - acrylic acid ester copolymer (molar ratio of 80:20) and ethylene - ethylacrylate -acrylic acid terpolymer (molar ratio of 80:10:10).
Claim 6
Dependent Claim
26 words
The liquid developer as claimed in claim 1, wherein said resin component of said toner is selected from the group consisting of propylene and modified propylene.
Claim 7
Dependent Claim
159 words
The liquid developer as claimed in claim 1, wherein said resin component of said toner is selected from the group consisting of copolymers and graft polymers of vinyl monomer A represented by formula (I), ##STR4## wherein R 1 is H or CH 3 ; and R 3 is COOC n H 2n+1 , in which n is an integer of 6 to 20, and at least one monomer selected from the group consisting of a vinyl monomer B represented by formula (II), ##STR5## wherein R 1 is H or CH 3 ; and R 2 is COOC n H 2n+1 , in which n is an integer of 1 to 5, COOCH 2 .CH═CH 2 , ##STR6## COOCH 2 .C(CH 3 )═CH 2 , COOH, COOCH 2 .CH 2 OH, COOCH 2 .CH 2 N(CH 3 ) 2 , or COOCH 2 .CH 2 N(C 2 H 5 ) 2 , vinylpyridine, ethylene glycol dimethacrylate, styrene, divinylbenzene and vinyltoluene.
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) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |