EP0054832A1
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EP
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A colloidal size hydrophobic polymer particulate having discrete particles of an inorganic material dispersed therein
Assignee: Dow Chemical Co
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Filing: 1981-12-07
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Granted: —
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Expires: 2001-12-07
Abstract
Abstract Colloidal size particles of an inorganic solid such as magnetic iron oxide or titanium dioxide 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 a stabilized aqueous colloidal dispersion of the inorganic particles and subjected to conditions of emulsion polymerization. The resulting encapsulated particles are usefully employed as catalysts, toners, pigments, and magnetic diagnostic latexes.
Inventors
- 👤 Jitka Solc
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 04:33
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/44; H01F1/445; B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/12; B01J13/14; B01J13/18; B01J31/00; B01J31/02; B01J31/06; B01J31/26; B01J31/28; B01J33/00; B82; B82Y; B82Y30/00; C; C08; C08F; C08F2/00; C08F2/44; C08F292/00; C09; C09C; C09C3/00; C09C3/08; C09D; C09D7/00; C09D7/40; C09D7/60; C09D7/61; C09D7/62; G; G03; G03G; G03G9/00; G03G9/08; G03G9/093; G03G9/09392; B01J31/40; B01J31/4007; C01; C01P; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/30; C01P2004/38; C01P2004/50; C01P2004/60; C01P2004/62; C01P2004/64; C01P2004/80; C01P2004/82; C01P2004/84; C01P2006/00; C01P2006/42; C01P2006/80; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
110 words
A process for preparing a colloidal size particulate comprising the steps of (1) emulsifying at least one hydrophobic, emulsion polymerizable monomer in an aqueous colloidal dispersion of discrete particles of an inorganic solid, said dispersion being maintained in a reasonably stable state with a chemical dispersant and/or surfactant and (2) subjecting the resulting emulsion to emulsion polymerization conditions to form a stable, fluid aqueous colloidal dispersion of the particulate wherein essentially every particle of the inorganic solid is coated with the hydrophobic polymer resulting from said polymerization such that substantially all of the inorganic particles are maintained in a discrete spaced apart relationship to each other by the hydrophobic polymer.
Claim 2
Dependent Claim
110 words
A process for preparing a colloidal size particulate comprising the steps of (1) emulsifying at least one hydrophobic, emulsion polymerizable monomer in an aqueous colloidal dispersion of discrete particles of an inorganic solid, said dispersion being maintained in a reasonably stable state with a chemical dispersant and/or surfactant and (2) subjecting the resulting emulsion to emulsion polymerization conditions to form a stable, fluid aqueous colloidal dispersion of the particulate wherein essentially every particle of the inorganic solid is coated with the hydrophobic polymer resulting from said polymerization such that substantially all of the inorganic particles are maintained in a discrete spaced apart relationship to each other by the hydrophobic polymer.
Claim 3
Dependent Claim
20 words
The process of Claim 1 wherein the particles of the inorganic solid have an average diameter less than 0.6 micrometer.
Claim 4
Dependent Claim
44 words
The process of Claim 1 wherein the aqueous dispersion of the inorganic solid is prepared by contacting said solid with an aqueous solution of a water-soluble surfactant and the same surfactant is used to emulsify the monomer in the aqueous dispersion of inorganic solid.
Claim 5
Dependent Claim
21 words
The method of Claim 1 wherein the inorganic solid is iron oxide, titanium dioxide, calcium carbonate, silica, zinc oxide or clay.
Claim 6
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 7
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 8
Dependent Claim
64 words
A stable, fluid aqueous colloidal dispersion comprising a continuous aqueous phase and a polymer/inorganic solid disperse phase wherein a substantial portion of the particles of the disperse phase comprise a hydrophobic polymer matrix having dispersed therein the colloidal inorganic solid particles such that substantially all of the inorganic particles are maintained in a discrete spaced apart relationship to each other by the hydrophobic polymer.
Claim 9
Dependent Claim
64 words
A stable, fluid aqueous colloidal dispersion comprising a continuous aqueous phase and a polymer/inorganic solid disperse phase wherein a substantial portion of the particles of the disperse phase comprise a hydrophobic polymer matrix having dispersed therein the colloidal inorganic solid particles such that substantially all of the inorganic particles are maintained in a discrete spaced apart relationship to each other by the hydrophobic polymer.
Claim 10
Dependent Claim
21 words
The dispersion of Claim 7 wherein the inorganic solid is magnetic and the dispersion exhibits the characteristics of a magnetic colloid.
Claim 11
Dependent Claim
31 words
A particulate having colloidal-size particles wherein substantially all of said particles comprise a hydrophobic polymer matrix and at least one discrete colloidal particle of an inorganic solid dispersed in said matrix.
Claim 12
Dependent Claim
31 words
A particulate having colloidal-size particles wherein substantially all of said particles comprise a hydrophobic polymer matrix and at least one discrete colloidal particle of an inorganic solid dispersed in said matrix.
Claim 13
Dependent Claim
43 words
The particulate of Claim 9 wherein the inorganic solid is iron oxide, titanium dioxide, calcium carbonate, silica, zinc oxide or clay, and the particulate contains from 1 to 70 weight percent of inorganic solid, from 30 to 99 weight percent of matrix polymer.
Claim 14
Dependent Claim
52 words
The particulate of Claim 9 wherein the inorganic solid is titanium dioxide and the particulate is a bimodal one with one mode having an average particle size in the range from 0.1 to 0.15 micrometer and the other mode having an average particle diameter in the range from 0.6 to 0.75 micrometer.
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