EP0334126A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Polymeric particles, preparation by colloidally stabilized suspension process, encapsulated toner particles containing them.
Assignee: Eastman Kodak Co
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Filing: 1989-03-10
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Granted: —
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Expires: 2009-03-10
Abstract
Abstract Polymeric particles comprising a core polymer covered by a layer of smaller copolymer particles and electrostatographic toners comprising such polymeric particles. A method of preparing such polymer particles having narrow size distribution in a suspension process employing a solid colloidal stabilizing agent. The solid colloidal stabilizer is a copolymer of 25 to 80% by weight, based on total monomer weight, of an addition polymerizable nonionic oleophilic monomer, 5 to 45%, by weight, of an addition polymerizable nonionic hydrophilic monomer, 1 to 50%, by weight, of an addition polymerizable ionic monomer, and 0 to 20 percent, by weight, of a crosslinking monomer having at least two addition polymerizable groups.
Inventors
- 👤 Mridula C/O Eastman Kodak Company Nair
- 👤 Zona Reynolds C/O Eastman Kodak Company Pierce
- 👤 Donna Anne C/O Eastman Kodak Company Diprima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 21:30
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: 11
Claim 1
Independent Claim
101 words
Polymer particles 1 having a core of polymer 2 coated with a layer of smaller particles 4 comprising a copolymer of (1) 25 to 80 percent by weight, based on total monomer weight, of an addition polymerizable nonionic oleophilic monomer; (2) 5 to 45 percent by weight, based on total monomer weight, of an addition polymerizable nonionic hydrophilic monomer; (3) 1 to 50 percent by weight, based on total monomer weight, of an addition polymerizable ionic monomer; and (4) 0 to 20 percent by weight based on total monomer weight, of a crosslinking monomer having at least two addition polymerizable groups.
Claim 2
Dependent Claim
101 words
Polymer particles 1 having a core of polymer 2 coated with a layer of smaller particles 4 comprising a copolymer of (1) 25 to 80 percent by weight, based on total monomer weight, of an addition polymerizable nonionic oleophilic monomer; (2) 5 to 45 percent by weight, based on total monomer weight, of an addition polymerizable nonionic hydrophilic monomer; (3) 1 to 50 percent by weight, based on total monomer weight, of an addition polymerizable ionic monomer; and (4) 0 to 20 percent by weight based on total monomer weight, of a crosslinking monomer having at least two addition polymerizable groups.
Claim 3
Dependent Claim
37 words
Polymer particles of claim 1, wherein the core polymer has an average diameter in the range of 2 to 20 micrometers and the copolymer particles have an average diameter in the range of 0.01 to 0.15 micrometer.
Claim 4
Dependent Claim
12 words
An electrostatographic toner comprising polymer particles according to claim 1 or 2.
Claim 5
Dependent Claim
135 words
A method of preparing polymer particles of claim 1 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, characterized in that the stabilizer comprises a copolymer of (1) 25 to 80 percent by weight, based on total monomer weight, of an addition polymerizable nonionic oleophilic monomer; (2) 5 to 45 percent by weight, based on total monomer weight, of an addition polymerizable nonionic hydrophilic monomer; (3) 1 to 50 percent by weight, based on total monomer weight, of an addition polymerizable ionic monomer; and (4) 0 to 20 percent by weight based on total monomer weight, of a crosslinking monomer having at least two addition polymerizable groups.
Claim 6
Dependent Claim
11 words
The method of claim 4, wherein the ionic monomer is anionic.
Claim 7
Dependent Claim
11 words
The method of claim 4, wherein the ionic monomer is cationic.
Claim 8
Dependent Claim
32 words
The method of claim 4, wherein the nonionic oleophilic monomer is styrene, the nonionic hydrophilic monomer is 2-hydroxyethyl methacrylate, the ionic monomer is methacrylic acid and the crosslinking monomer is ethylene dimethacrylate.
Claim 9
Dependent Claim
22 words
The method of claim 4, wherein the copolymer has an average diameter in the range of about 0.01 to about 0.15 micrometer.
Claim 10
Dependent Claim
22 words
The method of claim 4 comprising forming the polymer droplets by suspending polymerizable liquid monomer in aqueous medium and polymerizing said monomer.
Claim 11
Dependent Claim
24 words
The method of claim 4 comprising forming the polymer droplets by dissolving a polymer in a solvent that is immiscible with the aqueous media.
References Cited (Backward Citations)
No citation records indexed.
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