US3844811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Agglomeration of pigment particles and compositions utilizing same
Assignee: Reprographic Materials Inc
•
Filing: 1972-07-31
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Granted: 1974-10-29
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Expires: 1992-07-31
Abstract
Abstract Relatively spherical pigment particles of uniform size are obtained by mixing a coacervatable material with an aqueous dispersion of water insoluble pigment particles and an ionic surfactant causing coacervation of said system and effecting agglomeration of said pigment particles. The pigments can be agglomerated to any desired size and are useful in preparing toner compositions for electrophotography. Such toners comprise a core of said uniform substantially spherical pigment particles overcoated and substantially completely surrounded by a thermoplastic resinous coating.
Inventors
- 👤 C Brynko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:56
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/093; G03G9/09392; B; B01; B01J; B01J2/00; B01J2/02; B01J2/06; B01J2/08; C; C09; C09B; C09B67/00; C09B67/006; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/58; C09C3/00; C09C3/04; C09C3/045; C01; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/50; C01P2004/51; C01P2004/52; C01P2004/60; C01P2004/61; C01P2004/80
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
53 words
A PROCESS FOR PREPARING LARGER PIGMENT PARTICLE WHICH COMPRISES MIXING A COACERVATABLE MATERIAL WITH AN AQUEOUS DISPERSION OF WATER-INSOLUBLE PIGMENT PARTICLES AND AN IONIC SURFACTANT, CAUSING COACERVATION OF SAID COACERVATABLE MATERIAL AND EFFECTNG AGGLOMERATION OF SAID PIGMENT PARTICLES TO AN AVERAGE MEAN SIZE OF FROM 1-30 MICRONS, AND RECOVERING SAID AGGLOMERATED PIGMENT PARTICLES.
Claim 2
Dependent Claim
53 words
A PROCESS FOR PREPARING LARGER PIGMENT PARTICLE WHICH COMPRISES MIXING A COACERVATABLE MATERIAL WITH AN AQUEOUS DISPERSION OF WATER-INSOLUBLE PIGMENT PARTICLES AND AN IONIC SURFACTANT, CAUSING COACERVATION OF SAID COACERVATABLE MATERIAL AND EFFECTNG AGGLOMERATION OF SAID PIGMENT PARTICLES TO AN AVERAGE MEAN SIZE OF FROM 1-30 MICRONS, AND RECOVERING SAID AGGLOMERATED PIGMENT PARTICLES.
Claim 3
Dependent Claim
15 words
A process as defined in claim 1 wherein said ionic surfactant is a coacervatable material.
Claim 4
Dependent Claim
13 words
A process as defined in claim 1 wherein said ionic surfactant is cationic.
Claim 5
Dependent Claim
13 words
A process as defined in claim 1 wherein said ionic surfactant is anionic.
Claim 6
Dependent Claim
13 words
A process as defined in claim 1 wherein said pigment is carbon black.
Claim 7
Dependent Claim
13 words
A process as defined in claim 1 wherein said pigment is titanium dioxide.
Claim 8
Dependent Claim
15 words
A process as defined in claim 1 wherein said pigment is an organic water-insoluble dyestuff.
Claim 9
Dependent Claim
20 words
A process as defined in claim 1 wherein the average mean size of the pigment particles is from 1-30 microns.
Claim 10
Dependent Claim
53 words
A process as defined in claim 1 wherein the pigment particles obtained have an average size within the range of from about 10 to 20 microns, contain no substantial number of particles over about 30 microns, and have at least 80 percent of all particles of a size of from about 5-25 microns.
Claim 11
Dependent Claim
67 words
A process for preparing larger pigment particles which comprises forming an aqueous solution of a coacervatable material, incorporating an ionic surfactant and a dispersion of water-insoluble pigment particles of a size of 1 micron or less into said solution, causing coacervation of said coacervatable material and effecting agglomeration of said pigment particles to an average mean size of from 1-30 microns, and recovering said agglomerated pigment particles.
Claim 12
Dependent Claim
67 words
A process for preparing larger pigment particles which comprises forming an aqueous solution of a coacervatable material, incorporating an ionic surfactant and a dispersion of water-insoluble pigment particles of a size of 1 micron or less into said solution, causing coacervation of said coacervatable material and effecting agglomeration of said pigment particles to an average mean size of from 1-30 microns, and recovering said agglomerated pigment particles.
Claim 13
Dependent Claim
13 words
A process as defined in claim 10, wherein the pigment is carbon black.
Claim 14
Dependent Claim
15 words
A process as defined in claim 10, wherein the pigment is an organic water-insoluble dyestuff.
Claim 15
Dependent Claim
13 words
A process as defined in claim 10, wherein said pigment is titanium dioxide.
Claim 16
Dependent Claim
15 words
A process as defined in claim 10, wherein said coacervatable material is an ionic surfactant.
Claim 17
Dependent Claim
53 words
A process as defined in claim 10, wherein the pigment particles obtained have an average size within the range of from about 10 to 20 microns, contain no substantial number of particles over about 30 microns, and have at least 80 percent of all particles of a size of from about 5-25 microns.
Claim 18
Dependent Claim
15 words
A process as defined in claim 15, wherein said coacervatable material is an anionic surfactant.
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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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |