US5133992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colloidally stabilized suspension process
Assignee: Eastman Kodak Co
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Filing: 1990-05-07
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Granted: 1992-07-28
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Expires: 2010-05-07
Abstract
Abstract A method of preparing polymer particles having narrow size distribution in a suspension process employing a solid colloidal stabilizing agent. The solid colloidal stabilizer is a copolymer of about 25 to about 80% by weight, based on total monomer weight, of an addition polymerizable nonionic oleophilic monomer, about 5 to about 45%, by weight, of an addition polymerizable nonionic hydrophilic monomer, about 1 to about 50% of an addition polymerizable ionic monomer, and 0 to about 20 percent, by weight, of a crosslinking monomer having at least two addition polymerizable groups. Also disclosed are polymeric particles comprising a core polymer covered by a layer of the smaller copolymer stabilizer particles and electrostatographic toners comprising such polymeric particles.
Inventors
- 👤 Mridula Nair
- 👤 Zona R. Pierce
- 👤 Donna A. DiPrima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:16
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08784; G03G9/08795; G03G9/0825; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/06; Y10S525/00; Y10S525/902; Y10S526/00; Y10S526/909; Y10S526/91; Y10S526/911; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
140 words
In a method of preparing polymer particles which comprises forming a suspension of polymer droplets in an aqueous medium and forming a layer of solid colloidal stabilizer on the surface of the droplets to control the size and size distribution of the polymer particles, the improvement wherein the stabilizer comprises a copolymer of (1) about 25 to about 80 percent by weight, based on total monomer weight, of an addition polymerizable nonionic oleophilic monomer; (2) about 5 to about 45 percent by weight, based on total monomer weight, of an addition polymerizable nonionic hydrophilic monomer; (3) about 1 to about 50 percent by weight, based on total monomer weight, of an addition polymerizable ionic monomer; and (4) 0 to about 20 percent by weight based on total monomer weight, of a crosslinking monomer having at least two addition polymerizable groups.
Claim 2
Dependent Claim
140 words
In a method of preparing polymer particles which comprises forming a suspension of polymer droplets in an aqueous medium and forming a layer of solid colloidal stabilizer on the surface of the droplets to control the size and size distribution of the polymer particles, the improvement wherein the stabilizer comprises a copolymer of (1) about 25 to about 80 percent by weight, based on total monomer weight, of an addition polymerizable nonionic oleophilic monomer; (2) about 5 to about 45 percent by weight, based on total monomer weight, of an addition polymerizable nonionic hydrophilic monomer; (3) about 1 to about 50 percent by weight, based on total monomer weight, of an addition polymerizable ionic monomer; and (4) 0 to about 20 percent by weight based on total monomer weight, of a crosslinking monomer having at least two addition polymerizable groups.
Claim 3
Dependent Claim
61 words
The method of claim 1, wherein said copolymer comprises (1) about 35 to about 65 percent by weight of the nonionic oleophilic monomer, about 10 to about 35 percent by weight of the nonionic hydrophilic monomer, about 10 to about 25 percent by weight of the ionic monomer and about 4 to about 15 percent by weight of the crosslinking monomer.
Claim 4
Dependent Claim
11 words
The method of claim 1, wherein the ionic monomer is anionic.
Claim 5
Dependent Claim
11 words
The method of claim 1, wherein the ionic monomer is cationic.
Claim 6
Dependent Claim
12 words
The method of claim 1, wherein the nonionic oleophilic monomer is styrene.
Claim 7
Dependent Claim
26 words
The method of claim 5, wherein the nonionic hydrophilic monomer is 2-hydroxyethyl methacrylate, the ionic monomer is methacrylic acid and the crosslinking monomer is ethylene dimethacrylate.
Claim 8
Dependent Claim
23 words
The method according to claim 1, wherein the copolymer has an average diameter in the range of about 0.01 to about 1 micrometer.
Claim 9
Dependent Claim
22 words
The method of claim 7, wherein the copolymer has an average diameter in the range of about 0.01 to about 0.15 micrometer.
Claim 10
Dependent Claim
26 words
The method of claim 1 comprising the additional step of forming the polymer droplets by suspending polymerizable liquid monomer in aqueous medium and polymerizing said monomer.
Claim 11
Dependent Claim
28 words
The method of claim 1 comprising the additional step of forming the polymer droplets by dissolving a polymer in a solvent that is immiscible with the aqueous media.
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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) | 1995-07-28 | 1996-01-27 | 1996-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-28 | 2000-01-27 | 2000-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-28 | 2004-01-27 | 2004-07-28 | $7700.00 | Window Closed / Lapsed |