US5085965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative toner for developing latent electrostatic images
Assignee: Ricoh Co Ltd
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Filing: 1990-03-20
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Granted: 1992-02-04
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Expires: 2010-03-20
Abstract
Abstract A negatively chargeable toner for developing latent electrostatic images comprising a coloring agent, a resin component which comprises a homopolymer of a first monomer having formula (I) or a copolymer of the aforementioned first monomer and a second monomer: <IMAGE> (I) wherein R1 represents -H or -CH3; R2 and R3 each represent -CN, -COOH or -NO2; R4 represents -F, -Cl or -Br; and n is an integer of 1 to 10.
Inventors
- 👤 Toshiki Nanya
- 👤 Kimitoshi Yamaguchi
- 👤 Kazuo Tsubuko
- 👤 Toshihiko Takahashi
- 👤 Hiromitsu Kawase
- 👤 Makoto Ookawara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:43
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/26; C08F20/30; C08F20/34; C08F20/36; G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08726; G03G9/08728
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
77 words
A negatively chargeable toner for developing latent electrostatic images comprising a coloring agent and a resin component which comprises a homopolymer of a first monomer of formula (I) or a copolymer of said first monomer and a second monomer: ##STR5## wherein R 1 represents -H or -CH ; R 2 and R 3 each represent -CN, -COOH or -NO 2 ; R 4 represents -F, -Cl or -Br; and n is an integer of 1 to 10.
Claim 2
Dependent Claim
77 words
A negatively chargeable toner for developing latent electrostatic images comprising a coloring agent and a resin component which comprises a homopolymer of a first monomer of formula (I) or a copolymer of said first monomer and a second monomer: ##STR5## wherein R 1 represents -H or -CH ; R 2 and R 3 each represent -CN, -COOH or -NO 2 ; R 4 represents -F, -Cl or -Br; and n is an integer of 1 to 10.
Claim 3
Dependent Claim
17 words
The negatively chargeable toner as claimed in claim 1, wherein said second monomer is a vinyl monomer.
Claim 4
Dependent Claim
33 words
The negatively chargeable toner as claimed in claim 2, wherein said vinyl monomer is selected from the group consisting of styrene, α-methylstyrene, methylstyrene, alkyl acrylate, alkyl methacrylate, acrylonitrile, methacrylonitrile, vinyl acetate and vinylpyridine.
Claim 5
Dependent Claim
36 words
The negatively chargeable toner as claimed in claim 1, wherein said monomer is represented by the following formula: ##STR6## wherein R 1 represents -H or -CH 3 ; and n is an integer of 1to 10.
Claim 6
Dependent Claim
22 words
The negatively chargeable toner as claimed in claim 4, wherein said monomer has a structure selected from the group consisting of: ##STR7##
Claim 7
Dependent Claim
24 words
The negatively chargeable toner as claimed in claim 1, wherein said homopolymer or copolymer has a weight-average molecular weight ranging from 5,000 to 100,000.
Claim 8
Dependent Claim
24 words
The negatively chargeable toner as claimed in claim 6, wherein said homopolymer or copolymer has a weight-average molecular weight ranging from 8,000 to 30,000.
Claim 9
Dependent Claim
35 words
The negatively chargeable toner as claimed in claim 1, wherein the amount of said homopolymer or copolymer is in the range of 0.5 to 20 wt. % of the total amount of said resin component.
Claim 10
Dependent Claim
36 words
The negatively chargeable toner as claimed in claim 1, wherein said resin component comprises at least one resin selected from the group consisting of polystyrene, acrylic resin, styrene - acrylic copolymer, polyester, epoxy resin and polyolefin.
Claim 11
Dependent Claim
40 words
The negatively chargeable toner as claimed in claim 1, wherein said resin component comprises (a) one resin selected from the group consisting of polystyrene, acrylic resin, styrene - acrylic copolymer and epoxy resin, and (b) a low molecular weight polyolefin.
Claim 12
Dependent Claim
19 words
The negatively chargeable toner as claimed in claim 1, further comprising a magnetic material in the toner particles thereof.
Claim 13
Dependent Claim
36 words
The negatively chargeable toner as claimed in claim 11, wherein the amount of said magnetic material is in the range of 40 to 150 parts by weight to 100 parts by weight of said resin component.
Claim 14
Dependent Claim
38 words
The negatively chargeable toner as claimed in claim 1, further comprising a lubricant, an abrasive, a fluidity providing agent, an electroconductivity-imparting agent and a fixing performance promoting agent in the toner particles thereof or at the surfaces thereof.
Claim 15
Dependent Claim
53 words
The negatively chargeable toner as claimed in claim 1, further comprising at least one additive selected from the group consisting of fluoroplastics powder, zinc stearate powder, cerium oxide powder, silicon carbide powder, colloidal silica, aluminum oxide powder, carbon black and tin oxide powder in the toner particles thereof or at the surfaces thereof.
Claim 16
Dependent Claim
30 words
The negatively chargeable toner as claimed in claim 1, wherein said coloring agent is selected form the group consisting of yellow-type coloring agents, magenta-type coloring agents and cyan-type coloring agents.
Claim 17
Dependent Claim
87 words
A two-component type developer for developing latent electrostatic images comprising (i) toner particles which comprise a coloring agent and a resin component which comprises a homopolymer of a first monomer having formula (I) or a copolymer of said first monomer and a second monomer; ##STR8## wherein R 1 represents -H or -CH 3 ; R 2 and R 3 each represent -CN, -COOH or -NO 2 ; R 4 represents -F, -Cl or -Br; and n is an integer of 1 to 10; and (ii) carrier particles.
Claim 18
Dependent Claim
87 words
A two-component type developer for developing latent electrostatic images comprising (i) toner particles which comprise a coloring agent and a resin component which comprises a homopolymer of a first monomer having formula (I) or a copolymer of said first monomer and a second monomer; ##STR8## wherein R 1 represents -H or -CH 3 ; R 2 and R 3 each represent -CN, -COOH or -NO 2 ; R 4 represents -F, -Cl or -Br; and n is an integer of 1 to 10; and (ii) carrier particles.
Claim 19
Dependent Claim
16 words
The two-component type developer as claimed in claim 16, wherein said carrier particles have magnetic properties.
Claim 20
Dependent Claim
17 words
The two-component type developer as claimed in claim 16, wherein said second monomer is a vinyl monomer.
Claim 21
Dependent Claim
33 words
The two-component type developer as claimed in claim 18, wherein said vinyl monomer is selected from the group consisting of styrene, α-methylstyrene, methylstyrene, alkyl acrylate, alkyl methacrylate, acrylonitrile, methacrylonitrile, vinyl acetate and vinylpyridine.
Claim 22
Dependent Claim
37 words
The two-component type developer as claimed in claim 16, wherein said monomer is represented by the following formula: ##STR9## wherein R 1 represents -H or -CH 3 ; and n is an integer of 1 to 10.
Claim 23
Dependent Claim
24 words
The two-component type developer as claimed in claim 20, wherein said monomer has a structure selected from the group consisting of: ##STR10## and ##STR11##
Claim 24
Dependent Claim
24 words
The two-component type developer as claimed in claim 16, wherein said homopolymer or copolymer has a weight-average molecular weight ranging from 5,000 to 100,000.
Claim 25
Dependent Claim
24 words
The two-component type developer as claimed in claim 22, wherein said homopolymer or copolymer has a weight-average molecular weight ranging from 8,000 to 30,000.
Claim 26
Dependent Claim
35 words
The two-component type developer as claimed in claim 16, wherein the amount of said homopolymer or copolymer is in the range of 0.5 to 20 wt. % of the total amount of said resin component.
Claim 27
Dependent Claim
36 words
The two-component type developer as claimed in claim 16, wherein said resin component comprises at least one resin selected from the group consisting of polystyrene, acrylic resin, styrene - acrylic copolymer, polyester, epoxy resin and polyolefin.
Claim 28
Dependent Claim
40 words
The two-component type developer as claimed in claim 16, wherein said resin component comprises (a) one resin selected from the group consisting of polystyrene, acrylic resin, styrene - acrylic copolymer and epoxy resin, and (b) a low molecular weight polyolefin.
Claim 29
Dependent Claim
38 words
The two-component type developer as claimed in claim 16, further comprising a lubricant, an abrasive, a fluidity providing agent, an electroconductivity-imparting agent and a fixing performance promoting agent in said toner particles thereof or at the surfaces thereof.
Claim 30
Dependent Claim
53 words
The two-component type developer as claimed in claim 16, further comprising at least one additive selected from the group consisting of fluoroplastics powder, zinc stearate powder, cerium oxide powder, silicon carbide powder, colloidal silica, aluminum oxide powder, carbon black and tin oxide powder in said toner particles thereof or at the surfaces thereof.
Claim 31
Dependent Claim
30 words
The two-component type developer as claimed in claim 16, wherein said coloring agent is selected form the group consisting of yellow-type coloring agents, magenta-type coloring agents and cyan-type coloring agents.
References Cited (Backward Citations)
US4882258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |