US4447475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for composite polymer beads
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1980-06-02
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Granted: 1984-05-08
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Expires: 2000-06-02
Abstract
Abstract PCT No. PCT/AU80/00018 Sec. 371 Date Dec. 3, 1980 Sec. 102(e) Date Dec. 3, 1980 PCT Filed Jun. 2, 1980 PCT Pub. No. WO80/02687 PCT Pub. Date Dec. 11, 1980.A process of incorporating non-polymeric particulate matter such as magnetic materials, pigments and minerals, into a cross-linked styrene-based polymeric matrix, which process comprises dispersing the non-polymeric particles with a polymeric dispersant in a medium containing one or more vinyl monomers and a crosslinking agent, and adding a polymerization initiator. Typical polymeric dispersants are copolymers, styrenes and tertiary-nitrogen-containing vinyl monomers. Non-polymeric particulate matter incorporated into polymeric beads by this process is resistant to chemical attack and the beads may be used to prepare composite adsorbents or ion exchange resins.
Inventors
- 👤 Frederick J. Lubbock
- 👤 Christopher C. K. Mok
- 👤 Robert J. Eldridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:44
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28002; B01J20/28009; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J20/28004; B01J20/28014; B01J20/28016; B01J20/28026; C; C08; C08F; C08F2/00; C08F2/44; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11; H01F1/113; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
161 words
A process of incorporating non-polymeric magnetic particulate matter into a polymeric matrix so as to obtain composite particles or beads comprising the non-polymeric magnetic particulate matter coated or embedded in said matrix, said process comprising the steps of polymerizing while stirring a mixture of (1) a dispersion of the non-polymeric magnetic particulate matter in a medium comprising one or more vinyl monomers selected from the group consisting of styrene, substituted styrenes and vinyltoluenes, a polymeric dispersant selected from the group of copolymers consisting of styrene/2-vinylpyridine, styrene/4-vinylpyridine, styrene/vinyltrimethoxysilane and styrene/vinyltriethoxysilane, a cross-linking agent and a polymerization initiator, and (2) an aqueous phase containing a suspension stabilizer, to obtain said composite particles or beads and then separating said particles or beads from the polymerization medium; the weight ratio of non-polymeric magnetic particulate matter to the polymeric dispersant being in a range from 12:1 to 5:1; and the weight ratio of polymeric dispersant to vinyl monomers being in a range from 1:5 to 1:20.
Claim 2
Dependent Claim
161 words
A process of incorporating non-polymeric magnetic particulate matter into a polymeric matrix so as to obtain composite particles or beads comprising the non-polymeric magnetic particulate matter coated or embedded in said matrix, said process comprising the steps of polymerizing while stirring a mixture of (1) a dispersion of the non-polymeric magnetic particulate matter in a medium comprising one or more vinyl monomers selected from the group consisting of styrene, substituted styrenes and vinyltoluenes, a polymeric dispersant selected from the group of copolymers consisting of styrene/2-vinylpyridine, styrene/4-vinylpyridine, styrene/vinyltrimethoxysilane and styrene/vinyltriethoxysilane, a cross-linking agent and a polymerization initiator, and (2) an aqueous phase containing a suspension stabilizer, to obtain said composite particles or beads and then separating said particles or beads from the polymerization medium; the weight ratio of non-polymeric magnetic particulate matter to the polymeric dispersant being in a range from 12:1 to 5:1; and the weight ratio of polymeric dispersant to vinyl monomers being in a range from 1:5 to 1:20.
Claim 3
Dependent Claim
22 words
A process according to claim 1 wherein the magnetic particulate matter is selected from the group consisting of ferrites and chromium dioxide.
Claim 4
Dependent Claim
18 words
A process according to claim 3 wherein zircon particles are also used with the non-polymeric magnetic particulate matter.
Claim 5
Dependent Claim
15 words
A process according to claim 3 wherein the non-polymeric magnetic particulate matter comprises γ-iron oxide.
Claim 6
Dependent Claim
17 words
A process according to claim 1 wherein the copolymer contains from 80 to 97% w/w of styrene.
Claim 7
Dependent Claim
12 words
A process according to claim 1 wherein the crosslinking agent is divinylbenzene.
Claim 8
Dependent Claim
27 words
A process according to claim 1 wherein the non-polymeric magnetic particulate matter is coated with polymeric dispersant prior to the addition of vinyl monomers and crosslinking agent.
Claim 9
Dependent Claim
13 words
A process according to claim 1 wherein the suspension stabilizer is polyvinyl alcohol.
Claim 10
Dependent Claim
21 words
A process according to claim 8 wherein the weight ratio of organic phase is in a range from 1:5 to 1:20.
Claim 11
Dependent Claim
24 words
A process according to claim 9 wherein the weight ratio of organic phase to aqueous phase is in a range from 1:10 to 1:16.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |