US3793015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersion of particles in an organic liquid
Assignee: Agfa Gevaert NV
•
Filing: 1971-04-02
•
Granted: 1974-02-19
•
Expires: 1991-04-02
Abstract
Abstract A developing liquid for developing electrostatic images in electrophotographic reproduction in which electrostatically attractable pigment particles are dispersed in a non-polar, substantially water-immiscible organic liquid using as the dispersion assistant a bivalent or trivalent metal salt of a phosphorus oxyacid containing at least one organic residue having four or more carbon atoms. Preferred metal cations of the salt are zinc, cadmium, copper, aluminum and iron. The organic residue can be an aliphatic radical with a branched structure being preferred, and from 10 to 18 carbon atoms is an optimum range.
Inventors
- 👤 B Tavernier
- 👤 A Poot
- 👤 Engeland J Van
- 👤 Volder N De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:22
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/135; G03G9/1355
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
39 words
The method of claim 1 wherein a resin binding agent is incorporated in said developer dispersion and said phosphorus oxyacid salt is used in a ratio of about 10-200 mg per g. of said pigment particles to be dispersed.
Claim 2
Dependent Claim
1 words
MeII(RPO4)
Claim 3
Dependent Claim
11 words
MeIII(R2PO2)3, and D. Esters of phosphonates having any of the formulae:
Claim 4
Dependent Claim
26 words
MeIII(R2PO3)3 wherein: MeII is a bivalent metal cation, MeIII is a trivalent metal cation, and R is an organic radical containing at least four carbon atoms.
Claim 5
Dependent Claim
1 words
MeII(RHPO3)2
Claim 6
Dependent Claim
1 words
Me2III(RPO3)3
Claim 7
Dependent Claim
1 words
MeII(RHPO4)2
Claim 8
Dependent Claim
39 words
The method of claim 1 wherein said phosphorus oxyacid salt also functions as the essential binder agent for the particles and is used in a ratio of about 500-5000 mg. per g. of said pigment particles to be dispersed.
Claim 9
Dependent Claim
28 words
The method of claim 1 wherein said liquid developer dispersion has incorporated therein a polarity control agent to adjust the magnitude of the charge of said charged partIcles.
Claim 10
Dependent Claim
1 words
MeII(R2PO4)2
Claim 11
Dependent Claim
8 words
MeIII(RHPO3)3 C. Phosphinates having any of the formulae:
Claim 12
Dependent Claim
1 words
MeII(R2P2O7)
Claim 13
Dependent Claim
23 words
The method of claim 1 wherein said organic residue of said phosphorus oxyacid salt has a branched structure containing about 10-18 carbon atoms.
Claim 14
Dependent Claim
94 words
A liquid electrophoretic developer dispersion for the development of electrostatic images consisting essentially of a nonpolar organic liquid hydrocarbon substantially immiscible with water and having a boiling point within the range of about 150*-220*C, and positively charged electrostatically attractable finely divided particles dispersed in said liquid in the amount of about 0.1-1 gm/liter and having absorbed thereon as a dispersing agent for conferring said positive charge to said particles a bivalent or trivalent metal salt of an oxyacid derived from phosphorus containing at least one organic residue having at least about four carbon atoms.
Claim 15
Dependent Claim
1 words
MeIII(RPO3)3
Claim 16
Dependent Claim
1 words
Me2III(RPO4)3
Claim 17
Dependent Claim
29 words
A developer dispersion according to claim 6 wherein the said composition also contains a control agent which adjusts the magnitude of the charge on the dispersed positively charged particles.
Claim 18
Dependent Claim
78 words
A liquid developer dispersion according to claim 6 wherein the said metal salt is a salt of: a. a monoester or diester of an oxyacid derived from phosphorus, b. an oxyacid derived from phosphorus and containing one or two of said organic radicals linked to the phosphorus atom with a carbon atoms, or c. an oxyacid derived from phosphorus and containing an ester group and said organic radical is linked with a carbon atom to the phosphorus atom.
Claim 19
Dependent Claim
1 words
MeIII(RHPO4)3
Claim 20
Dependent Claim
1 words
MeIII(R2PO4)3
Claim 21
Dependent Claim
20 words
A developer dispersion according to claim 6 wherein the said salt is a zinc, cadmium, copper, aluminum or iron salt.
Claim 22
Dependent Claim
22 words
A developer dispersion according to claim 6 wherein the salt comprises at least one organic residue containing 10 to 18 carbon atoms.
Claim 23
Dependent Claim
8 words
Me2III(R2P2O7)3 B. Phosphonates having any of the formulae:
Claim 24
Dependent Claim
15 words
A developer dispersion according to claim 6 wherein the organic residue has a branched structure.
Claim 25
Dependent Claim
25 words
A developer dispersion according to claim 6 wherein the organic residue is an aliphatic radical having a branched structure or substituted with an hydrophobic radical.
Claim 26
Dependent Claim
26 words
A developer dispersion according to claim 6 wherein the non-polar organic liquid is a mixture of aliphatic hydrocarbons containing only a minor amount of aromatic hydrocarbons.
Claim 27
Dependent Claim
18 words
A developer dispersion according to claim 6 wherein the positively charged particles also include a resin fixing agent.
Claim 28
Dependent Claim
16 words
A developer dispersion according to claim 6 wherein the said particles are positively charged carbon particles.
Claim 29
Dependent Claim
31 words
A developer dispersion according to claim 6 wherein the bivalent or trivalent salt is one selected from the group consisting of: A. hypo-, ortho-, and pyrophosphates having any of the formulae:
Claim 30
Dependent Claim
16 words
A developer dispersion according to Claim 6 wherein the bivalent metal salt is zinc monotridecyl phosphate.
Claim 31
Dependent Claim
15 words
A developer dispersion according to claim 6 wherein the bivalent metal salt is zinc(2-butyl)-octyl phosphate.
References Cited (Backward Citations)
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US2616904A
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US3402188A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |