US4473630A
Expired / Lapsed
US
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Liquid developer comprising aminoalkyl styrene polymer for electrostatic images
Assignee: Fujifilm Holdings Corp
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Filing: 1982-12-20
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Granted: 1984-09-25
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Expires: 2002-12-20
Abstract
Abstract A liquid developer for electrostatic images which comprises toner particles dispersed in a nonaqueous medium having an electrical resistance of 10 9 Ω·cm or more and a dielectric constant of 3 or less, wherein said toner particles are composed of a resin polymer comprised of monomer units selected from the group of monomers represented by the following formula (I) and a coloring agent: ##STR1## wherein X represents ##STR2## and n represents an integer of 1-6, wherein R 1 and R 2 each represents an alkyl group having 1-18 carbon atoms, and alkyl substituted or nonsubstituted aryl group (the substituent being an alkyl group having 1-12 carbon atoms), or an aralkyl group (substituent alkyl groups in case that the benzene nucleus is substituted by alkyl groups have 1-12 carbon atoms, and the alkylene group has 1-12 carbon atoms).
Inventors
- 👤 Hiroaki Yokoya
- 👤 Hiromichi Tachikawa
- 👤 Nobuo Suzuki
- 👤 Shu Watarai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:59
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/131
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
151 words
A liquid developer for electrostatic images which comprises toner particles dispersed in a nonaqueous medium having an electrical resistance of 10 9 ·Ω·cm or more and a dielectric constant of 3 or less, wherein said toner particles are obtained by grinding a mixture of a coloring agent and a resin polymer comprised of monomer units selected from the group of monomers represented by the following formula (I) ##STR10## wherein X represents ##STR11## and n represents an integer of 1-6, wherein R 1 and R 2 each represents an alkyl group having 1-18 carbon atoms, an alkyl substituted or nonsubstituted aryl group (the substituent being an alkyl group having 1-12 carbon atoms), or an aralkyl group (substituent alkyl groups in case that the benzene nucleus is substituted by alkyl group having 1-12 carbon atoms, and the alkylene group has 1-12 carbon atoms), said resin polymer not completely dissolving in said nonaqueous medium.
Claim 2
Dependent Claim
151 words
A liquid developer for electrostatic images which comprises toner particles dispersed in a nonaqueous medium having an electrical resistance of 10 9 ·Ω·cm or more and a dielectric constant of 3 or less, wherein said toner particles are obtained by grinding a mixture of a coloring agent and a resin polymer comprised of monomer units selected from the group of monomers represented by the following formula (I) ##STR10## wherein X represents ##STR11## and n represents an integer of 1-6, wherein R 1 and R 2 each represents an alkyl group having 1-18 carbon atoms, an alkyl substituted or nonsubstituted aryl group (the substituent being an alkyl group having 1-12 carbon atoms), or an aralkyl group (substituent alkyl groups in case that the benzene nucleus is substituted by alkyl group having 1-12 carbon atoms, and the alkylene group has 1-12 carbon atoms), said resin polymer not completely dissolving in said nonaqueous medium.
Claim 3
Dependent Claim
44 words
A liquid developer for electrostatic images as claimed in claim 1, wherein the resin polymer is comprised of a plurality of monomer units represented by the general formula (I), and wherein some of the monomer units are ortho compounds, meta compounds, and para compounds.
Claim 4
Dependent Claim
27 words
A liquid developer for electrostatic images as claimed in claim 1, wherein the resin polymer contains the monomer units in an amount of 0.1% mol or more.
Claim 5
Dependent Claim
28 words
A liquid developer for electrostatic images as claimed in claim 3, wherein the resin polymer contains the monomer units in an amount of 1.0% by mol or more.
Claim 6
Dependent Claim
28 words
A liquid developer for electrostatic images as claimed in claim 4, wherein the resin polymer contains the monomer units in an amount of 5.0% by mol or more.
Claim 7
Dependent Claim
27 words
A liquid developer for electrostatic images as claimed in claim 1, wherein the resin polymer has a molecular weight of about 10 3 to 10 7 .
Claim 8
Dependent Claim
26 words
A liquid developer for electrostatic images as claimed in claim 6, wherein the resin polymer has a molecular weight of 10 4 to 10 6 .
Claim 9
Dependent Claim
17 words
A liquid developer for electrostatic images as claimed in claim 1, further comprising an additional resin compound.
Claim 10
Dependent Claim
37 words
A liquid developer for electrostatic images as claimed in claim 8, wherein the additional resin compound is present in an amount of 0.01 to 100 parts by weight per 1 part by weight of the resin polymer.
Claim 11
Dependent Claim
36 words
A liquid developer for electrostatic images as claimed in claim 1, wherein the coloring agent is present in an amount of 1 part by weight per 0.01 to 100 parts by weight of the polymer resin.
Claim 12
Dependent Claim
36 words
A liquid developer for electrostatic images as claimed in claim 10, wherein the coloring agent is present in an amount of 1 part by weight per 0.1 to 10 parts by weight of the resin polymer.
Claim 13
Dependent Claim
23 words
A liquid developer for electrostatic images as claimed in claim 1, wherein the toner particles have a size of about 1 to 0.05μ.
Claim 14
Dependent Claim
37 words
A liquid developer for electrostatic images as claimed in claim 1, wherein the toner particles are present within the nonaqueous medium in an amount of 0.001 grams to about 100 grams per liter of the nonaqueous medium.
Claim 15
Dependent Claim
38 words
A liquid developer for electrostatic images as claimed in claim 9, wherein the toner particles are present within the nonaqueous medium in an amount of about 0.01 grams to about 10 grams per liter of the nonaqueous medium.
Claim 16
Dependent Claim
24 words
A liquid developer for electrostatic images as claimed in claim 1, wherein the resin polymer has a softening point of 40° to 180° C.
Claim 17
Dependent Claim
24 words
A liquid developer for electrostatic images as claimed in claim 15, wherein the resin polymer has a softening point of 50° to 150° C.
References Cited (Backward Citations)
US4181620A
Cited
US4357363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |