US4609608A
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US
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Colloidal size hydrophobic polymer particulate having discrete particles of a metal dispersed therein
Assignee: Dow Chemical Co
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Filing: 1985-02-15
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Granted: 1986-09-02
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Expires: 2005-02-15
Abstract
Abstract Colloidal size particles of a non-oxidized metal (e.g., iron or silver) are encapsulated in a hydrophobic polymer (e.g., a copolymer of styrene and butylacrylate) by a polymerization process wherein a water-immiscible monomer is dispersed in an aqueous colloidal dispersion of preformed metal particles and subjected to conditions of emulsion polymerization. The resulting encapsulated non-oxidized metal particles are usefully employed as electrically resistive barriers, toners, electroconductive additives and as pressure sensors.
Inventors
- 👤 Jitka Solc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:36
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/44; H01F1/445; B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/12; B01J13/14; B01J31/00; B01J31/02; B01J31/06; B01J33/00; B01J35/00; B01J35/20; B01J35/23; B82; B82Y; B82Y30/00; C; C08; C08F; C08F2/00; C08F2/44; C08F292/00; C09; C09C; C09C3/00; C09C3/08; G; G03; G03G; G03G9/00; G03G9/08; G03G9/093; G03G9/09392; 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
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
62 words
An 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 essentially non-oxidized colloidal metal particles such that substantially all of the inorganic particles are maintained in a discrete spaced apart relationship to one another by the hydrophobic polymer.
Claim 2
Dependent Claim
62 words
An 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 essentially non-oxidized colloidal metal particles such that substantially all of the inorganic particles are maintained in a discrete spaced apart relationship to one another by the hydrophobic polymer.
Claim 3
Dependent Claim
15 words
The dispersion of claim 1 wherein said inorganic solid is an essentially non-oxidized magnetic metal.
Claim 4
Dependent Claim
28 words
The dispersion of claim 1 wherein the essentially non-oxidized metal is aluminum, cobalt, iron, copper, nickel, chromium, zinc, palladium, silver, ruthenium, platinum, gold, rhodium, lead, and alloys thereof.
Claim 5
Dependent Claim
28 words
The dispersion of claim 1 wherein the polymer is a polymer of a monovinylidene aromatic monomer, an alkyl ester of an unsaturated carboxylic acid, or a mixture thereof.
Claim 6
Dependent Claim
16 words
The dispersion of claim 1 wherein the polymer is a copolymer of styrene and butyl acrylate.
Claim 7
Dependent Claim
18 words
The dispersion of claim 1 wherein the metal particles have an average diameter less than about 0.9 micrometer.
Claim 8
Dependent Claim
23 words
The dispersion of claim 1 wherein the metal particles have an average diameter in the range from about 0.005 to about 0.6 micrometer.
Claim 9
Dependent Claim
46 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, wherein said inorganic solid is in the form of essentially non-oxidized colloidal metal particles.
Claim 10
Dependent Claim
46 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, wherein said inorganic solid is in the form of essentially non-oxidized colloidal metal particles.
Claim 11
Dependent Claim
28 words
The particulate of claim 8 wherein the essentially non-oxidized metal is aluminum, cobalt, iron, copper, nickel, chromium, zinc, palladium, silver, ruthenium, platinum, gold, rhodium, lead, and alloys thereof.
Claim 12
Dependent Claim
28 words
The particulate of claim 8 wherein the polymer is a polymer of a monovinylidene aromatic monomer, an alkyl ester of an unsaturated carboxylic acid, or a mixture thereof.
Claim 13
Dependent Claim
18 words
The particulate of claim 8 wherein the metal particles have an average diameter less than about 0.9 micrometer.
Claim 14
Dependent Claim
23 words
The particulate of claim 8 wherein the metal particles have an average diameter in the range from about 0.005 to about 0.6 micrometer.
Claim 15
Dependent Claim
30 words
The particulate of claim 8 which contains from about 1 to about 70 weight percent inorganic solid and from about 30 to about 99 weight percent of said matrix polymer.
References Cited (Backward Citations)
US4421660A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |