Patent US4123374A successfully refreshed from Google Patents.
US4123374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophoretic development
Assignee: Agfa Gevaert NV
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Filing: 1977-01-19
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Granted: 1978-10-31
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Expires: 1997-01-19
Abstract
Abstract A liquid developer composition suitable for use in developing electrostatic charge patterns, which composition contains in an electrically insulating carrier liquid having a volume resistivity of at least 10 9 Ohm·cm and a dielectric constant below 3, a dispersed particulate coloring substance bearing one or more charge control substances and an organic polymeric material, wherein said polymeric material is a copolymer containing the following recurring units (A) and (B) or (A) and (C): ##STR1## wherein: R represents hydrogen or an alkyl group of 1 to 4 carbon atoms, R 1 represents hydrogen or an acyl group, R 2 represents hydrogen or carboxyl in free acid or salt form, R 3 represents hydroxyl or an ether group, A represents an alkylene chain of 12 to 20 carbon atoms, Y 1 represents --CO--O--CH 2 --CHOH--CH 2 -- Y 2 represents --CO--, and x represents 4 to 20.
Inventors
- 👤 Yvan K. Gilliams
- 👤 Noel J. De Volder
- 👤 Walter F. De Winter
- 👤 Bernard H. Tavernier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:08
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/131; Y; Y10; Y10S; Y10S526/00; Y10S526/934
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
181 words
A liquid developer composition for use in developing electrostatic charge patterns, which composition contains in an electrically insulating carrier liquid having a volume resistivity of at least 10 9 Ohm.cm and a dielectric constant below 3, a dispersed particulate colouring substance bearing at least one charge control substance and an organic polymeric material, wherein said polymeric material is a copolymer containing recurring units in the amount of at least about 49% by weight of B or C, a sufficient amount of A to adsorb the copolymer upon said dispersed particulate colouring substance, and up to about 2% by weight of D, wherein said units A-D have the following structural formulae: ##STR12## wherein: R represents an alkyl group of 1 to 4 carbon atoms, R 1 represents a hydrogen or an acyl group, R 2 represents hydrogen or carboxyl in free acid or salt form, R 3 represents hydroxyl or an ether group, A represents an alkylene chain of 12 to 20 carbon atoms, Y 1 represents --CO--O--CH 2 --CHOH--CH 2 --, Y 2 represents --CO--, and x represents 4 to 20.
Claim 2
Dependent Claim
181 words
A liquid developer composition for use in developing electrostatic charge patterns, which composition contains in an electrically insulating carrier liquid having a volume resistivity of at least 10 9 Ohm.cm and a dielectric constant below 3, a dispersed particulate colouring substance bearing at least one charge control substance and an organic polymeric material, wherein said polymeric material is a copolymer containing recurring units in the amount of at least about 49% by weight of B or C, a sufficient amount of A to adsorb the copolymer upon said dispersed particulate colouring substance, and up to about 2% by weight of D, wherein said units A-D have the following structural formulae: ##STR12## wherein: R represents an alkyl group of 1 to 4 carbon atoms, R 1 represents a hydrogen or an acyl group, R 2 represents hydrogen or carboxyl in free acid or salt form, R 3 represents hydroxyl or an ether group, A represents an alkylene chain of 12 to 20 carbon atoms, Y 1 represents --CO--O--CH 2 --CHOH--CH 2 --, Y 2 represents --CO--, and x represents 4 to 20.
Claim 3
Dependent Claim
24 words
A liquid developer composition according to claim 1, wherein A represents an alkylene chain of 17 carbon atoms and R represents an isobutyl group.
Claim 4
Dependent Claim
25 words
A liquid developer composition according to claim 1, wherein R 3 represents an alkoxy group with an alkyl chain of 12 to 18 carbon atoms.
Claim 5
Dependent Claim
16 words
A liquid developer composition according to claim 1, wherein the particulate colouring substance is carbon black.
Claim 6
Dependent Claim
22 words
A liquid developer composition according to claim 1, wherein the charge control substance(s) offer(s) a positive charge to the dispersed particulate substance.
Claim 7
Dependent Claim
22 words
A liquid developer composition according to claim 1, wherein such charge control substance imparts a negative charge to the dispersed particulate substance.
Claim 8
Dependent Claim
31 words
A liquid developer composition according to claim 1, wherein as charge control substance a metallic salt of an organic acid with aliphatic chain having at least 6 carbon atoms is used.
Claim 9
Dependent Claim
89 words
A liquid developer composition according to claim 5, wherein as charge control substance there is present a bivalent or trivalent metal salt of (a) a monoester or diester of an oxyacid derived from phosphorus, (b) an oxyacid derived from phosphorus and containing one or two organic groups linked to the phosphorus atom by a carbon atom, or (c) an oxyacid derived from phosphorus and containing an ester group and an organic group linked by a carbon atom to the phosphorus atom, said organic group being aliphatic, cycloaliphatic or aromatic.
Claim 10
Dependent Claim
80 words
A liquid developer composition according to claim 5, wherein as charge control substance there is present a metal alkyl sulphonate in which the metal ion is a bivalent metal ion selected from the group consisting of zinc(II), lead(II), cadmium(II) and copper(II) or is a trivalent metal ion of the group VIII of the Periodic Table of the Elements, and in which the sulphonate group is present directly on an alkyl chain containing at least 6 carbon atoms in straight line.
Claim 11
Dependent Claim
17 words
A liquid developer composition according to claim 1, wherein the insulating carrier liquid is an aliphatic hydrocarbon.
Claim 12
Dependent Claim
27 words
A liquid developer composition according to claim 1, wherein said copolymer is present in an amount of at least 0.25 g per g of dry colouring substance.
Claim 13
Independent Claim
194 words
A method of rendering visible an electrostatic charge pattern on a dielectric material, which method comprises containing said surface with a liquid developer composition comprising charged toner suspended in an electrically insulating carrier liquid having a volume resistivity of at least 10 9 Ohm·cm and a dielectric constant below 3, a dispersed particulate colouring substance bearing at least one charge control substance and an organic polymeric material, wherein said polymeric material is a copolymer containing recurring units in the amount of at least about 49% by weight of B or C, a sufficient amount of A to adsorb the copolymer upon said dispersed particulate colouring substance, and up to about 2% by weight of D, wherein said units A-D have the following structural formulae: ##STR13## wherein: R represents an alkyl group of 1 to 4 carbon atoms R 1 represents hydrogen or an acyl group, R 2 represents hydrogen or carboxyl in free acid or salt form, R 3 represents hydroxyl or an ether group, A represents an alkylene chain of 12 to 20 carbon atoms, Y 1 represents --CH--O--CH 2 --CHOH--CH 2 --, Y 2 represents --CO--, and x represents 4 to 20.
Claim 14
Independent Claim
194 words
A method of rendering visible an electrostatic charge pattern on a dielectric material, which method comprises containing said surface with a liquid developer composition comprising charged toner suspended in an electrically insulating carrier liquid having a volume resistivity of at least 10 9 Ohm·cm and a dielectric constant below 3, a dispersed particulate colouring substance bearing at least one charge control substance and an organic polymeric material, wherein said polymeric material is a copolymer containing recurring units in the amount of at least about 49% by weight of B or C, a sufficient amount of A to adsorb the copolymer upon said dispersed particulate colouring substance, and up to about 2% by weight of D, wherein said units A-D have the following structural formulae: ##STR13## wherein: R represents an alkyl group of 1 to 4 carbon atoms R 1 represents hydrogen or an acyl group, R 2 represents hydrogen or carboxyl in free acid or salt form, R 3 represents hydroxyl or an ether group, A represents an alkylene chain of 12 to 20 carbon atoms, Y 1 represents --CH--O--CH 2 --CHOH--CH 2 --, Y 2 represents --CO--, and x represents 4 to 20.
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) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |