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US4680200A
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Method for preparing colloidal size particulate
Assignee: Dow Chemical Co
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Filing: 1985-07-22
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Granted: 1987-07-14
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Expires: 2005-07-22
Abstract
Abstract Colloidal size particles of an organic solid such as a pigment are encapsulated in a hydrophobic addition polymer such as a polymer of styrene by a polymerization process wherein a water-immiscible (hydrophobic) monomer is dispersed in an aqueous colloidal dispersion of the organic particles and subjected to conditions of emulsion polymerization. The resulting encapsulated particles are usefully employed as toners and pigments.
Inventors
- 👤 Jitka Solc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:10
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0004; C09B67/0008; C09B67/0013; C08; C08F; C08F2/00; C08F2/44; Y; Y10; Y10S; Y10S526/00; Y10S526/909; Y10S526/911; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2989
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
A method for preparing a colloidal size particulate comprising the steps of (1) emulsifying a hydrophobic, emulsion polymerizable monomer in an aqueous colloidal dispersion of essentially water-insoluble organic solid particles that have not been pretreated with polymer, acid or other conventional anchoring agents, said dispersion being maintained with a surfactant and/or emulsifier, and (2) subjecting the resulting emulsion to emulsion polymerization conditions to form a stable, fluid aqueous colloidal dispersion of the particulate wherein essentially every organic solid particle is coated with the hydrophobic polymer resulting from said polymerization such that substantially all of the organic particles are maintained in a discrete spaced apart relationship to each other by the hydrophobic polymer.
Claim 2
Independent Claim
112 words
A method for preparing a colloidal size particulate comprising the steps of (1) emulsifying a hydrophobic, emulsion polymerizable monomer in an aqueous colloidal dispersion of essentially water-insoluble organic solid particles that have not been pretreated with polymer, acid or other conventional anchoring agents, said dispersion being maintained with a surfactant and/or emulsifier, and (2) subjecting the resulting emulsion to emulsion polymerization conditions to form a stable, fluid aqueous colloidal dispersion of the particulate wherein essentially every organic solid particle is coated with the hydrophobic polymer resulting from said polymerization such that substantially all of the organic particles are maintained in a discrete spaced apart relationship to each other by the hydrophobic polymer.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the particles of organic solids have an average diameter of less than about 0.9 micrometer.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the particles of organic solids are organic pigments.
Claim 5
Dependent Claim
33 words
The method of claim 1 wherein a water-soluble surfactant is used to emulsify the hydrophobic monomer, said surfactant being a potassium salt of a functionalized oligomer or a salt of a fatty acid.
Claim 6
Dependent Claim
26 words
The method of claim 1 wherein the monomer is a monovinylidene aromatic monomer, an alkyl ester of an ethylenically unsaturated carboxylic acid, or a mixture thereof.
Claim 7
Dependent Claim
16 words
The method of claim 5 wherein the polymer is a polymer of styrene and butyl acrylate.
References Cited (Backward Citations)
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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) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |