US4639404A
Expired / Lapsed
US
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Liquid developer for development of electrostatic images
Assignee: Agfa Gevaert NV
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Filing: 1985-09-26
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Granted: 1987-01-27
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Expires: 2005-09-26
Abstract
Abstract A liquid developer composition that is suitable for rendering visible electrostatically charged areas, which composition contains in an electrically insulating non-polar carrier liquid having a volume resistivity of at least 10 9 ohm.cm and a dielectric constant less than 3, dispersed coloring matter acting as toner particles and at least one anionic addition polymer comprising anionic groups neutralized with non-polymeric counter cations, characterized in that said cations are positively charged metal ion containing coordination compounds.
Inventors
- 👤 Herman J. Uytterhoeven
- 👤 Walter F. De Winter
- 👤 August M. Marien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:50
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/131; G03G9/135; G03G9/1355
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
A liquid developer composition that is suitable for rendering visible electrostatically charged areas, which composition contains in an electrically insulating non-polar carrier liquid having a volume resistivity of at least 10 9 ohm.cm and a dielectric constant less than 3, dispersed colouring matter acting as toner particles and at least one anionic addition polymer comprising anionic groups neutralized with non-polymeric counter cations, characterized in that said cations are positively charged metal ion containing coordination compounds.
Claim 2
Dependent Claim
75 words
A liquid developer composition that is suitable for rendering visible electrostatically charged areas, which composition contains in an electrically insulating non-polar carrier liquid having a volume resistivity of at least 10 9 ohm.cm and a dielectric constant less than 3, dispersed colouring matter acting as toner particles and at least one anionic addition polymer comprising anionic groups neutralized with non-polymeric counter cations, characterized in that said cations are positively charged metal ion containing coordination compounds.
Claim 3
Dependent Claim
126 words
Liquid developer composition according to claim 1, characterized in that the positively charged metal ion containing coordination compounds are selected from the group: (1) unidentate compounds with Me + (me=metal); (2) bidentate compounds with central Me + , Me 2+ , Me 3+ or Me 4+ ion; (3) tridentate compounds with central Me + , Me 2+ , Me 3+ or Me 4+ ion, (4) coordination compounds containing a polyethylene oxide chain, (5) crown-ether compounds (macromonocyclic polyether compounds) with central metal ion, (6) cryptate compounds (macrobicyclic polyether compounds) with central metal ion, (7) quadridentate compounds with central Me + , Me 2+ , Me 3+ or Me 4+ ion, (8) sextadentate compounds with central Me + , Me 2+ , Me 3+ or Me 4+ ion.
Claim 4
Dependent Claim
24 words
Liquid developer composition according to claim 1, characterized in that the positively charged metal ion containing coordination compounds are glyme-compounds with central metal ion.
Claim 5
Dependent Claim
22 words
Liquid developer composition according to claim 1, characterized in that the positively charged metal ion containing coordination compound is formed with acetylacetone.
Claim 6
Dependent Claim
26 words
Liquid developer composition according to claim 1, characterized in that the positively charged metal ion containing coordination compound is formed with a diamine, tri-amine or tetra-amine.
Claim 7
Dependent Claim
105 words
Liquid developer composition according to claim 1, characterized in that the anionic polymers are prepared by polymerization of anionic monomers within the scope of the following general formula: ##STR22## wherein: R 1 represents hydrogen or lower (C 1 -C 3 )alkyl, Z represents a bivalent hydrocarbon group or represents a bivalent hydrocarbon group interrupted by nitrogen and/or oxygen, or said group interrupted by --CO--O-- or represents a --CONH-alkylene group, n represents zero or 1, and X represents --COO - , --SO 3 - , --SO 4 - , --PO 4 H 2 - or --PO 4 HR - , wherein R represents a hydrocarbon group.
Claim 8
Dependent Claim
38 words
Liquid developer composition according to claim 6, characterized in that in said polymer the recurring units associated with said positively charged metal ion containing coordination compounds are combined with recurring units of non-ionic hydrophobic, solvatable and/or non-solvatable monomers.
Claim 9
Dependent Claim
82 words
Liquid developer composition according to claim 6, characterized in that the solvatable monomers are: alkylstyrenes having from 3 to 10 carbon atoms in the alkyl group, alkoxystyrenes having from 3 to 10 carbon atoms in the alkyl group, alkyl acrylates and methacrylates having from 8 to 22 carbon atoms in the alkyl group, vinyl alkyl ethers having from 8 to 22 C-atoms in the alkyl group, vinyl esters of alkanoic acids having from 6 to 22 carbon atoms in the alkyl group.
Claim 10
Dependent Claim
68 words
Liquid developer composition according to claim 6, characterized in that the non-solvatable monomers are: (a) α,β-ethylenically unsaturated carboxylic acid alkyl esters with a C 1 -C 4 alkyl group, (b) styrene, methylstyrene, methoxystyrene and halogenated styrene, (c) vinyl alkyl ethers having a C1 to C4-alkyl group, and (d) vinyl esters of alkanoic acids having from 1 to about 4 carbon atoms in the alkyl groups and mixtures thereof.
Claim 11
Dependent Claim
35 words
Liquid developer composition according to claim 6, characterized in that the percent by weight of anionic polymer with respect to the colouring matter of the liquid developer is in the range of 2 to 50.
References Cited (Backward Citations)
US4564574A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |