US4965131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colloidally stabilized suspension process
Assignee: Eastman Kodak Co
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Filing: 1988-03-21
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Granted: 1990-10-23
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Expires: 2008-03-21
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 additional 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
2026-10-26 13:38
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0825; G03G9/087; G03G9/08784; G03G9/08795; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
105 words
Polymer particles having a core of polymer coated with a layer of smaller particles comprising 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
105 words
Polymer particles having a core of polymer coated with a layer of smaller particles comprising 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
58 words
Polymer particles of claim 1, wherein said copolymer comprises 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 of the crosslinking monomer.
Claim 4
Dependent Claim
13 words
The polymer particles of claim 1, wherein the nonionic oleophilic monomer is styrene.
Claim 5
Dependent Claim
26 words
Polymer particles of claim 3, wherein the nonionic hydrophilic monomer is 2-hydroxyethyl methacrylate, the ionic monomer is methacrylic acid and the crosslinking monomer is ethylene dimethacrylate.
Claim 6
Dependent Claim
41 words
Polymer particles of claim 1, wherein the core polymer has an average diameter in the range of about 2 to about 20 micrometers and the copolymer particles have an average diameter in the range of about 0.01 to about 0.15 micrometer.
Claim 7
Dependent Claim
10 words
An electrostatographic toner comprising polymer particles according to claim 5.
Claim 8
Dependent Claim
10 words
An electrostatographic toner comprising polymer particles according to claim 1.
Claim 9
Dependent Claim
13 words
An electrostatographic toner of claim 7, wherein the core polymer is a polyester.
Claim 10
Dependent Claim
44 words
An electrostatographic toner of claim 7, wherein the core polymer is a styrene polymer having an average diameter of about 2 to about 20 micrometers and the smaller copolymer particles have an average diameter in the range of about 0.01 to about 1 micrometer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |