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Patent US3947526A successfully refreshed from Google Patents.
US3947526A
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Polymerization of vinylpyridine
Assignee: Chevron USA Inc
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Filing: 1974-02-01
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Granted: 1976-03-30
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Expires: 1994-02-01
Abstract
Abstract Vinylpyridine is polymerized in aqueous suspension in the presence of small solid particles of polyolefin.
Inventors
- 👤 Robert Bacskai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:52
CPC Classifications
C; C08; C08F; C08F255/00; C08F20/00; C08F20/02; C08F20/08; C08F257/00; C08F257/02; Y; Y10; Y10S; Y10S525/00; Y10S525/916
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
108 words
Small polymer particles of polyvinylpyridine of 50 to 2,000 microns diameter having small particles of Ziegler-catalyzed polymer embedded therein, said polymer particles of polyvinylpyridine being produced by the process which comprises polymerizing vinylpyridine in aqueous suspension in the presence of solid particles having diameters in the range 50-600 microns of Ziegler-catalyzed polystyrene or polyolefin of low molecular weight olefins, said polyolefin being derived from 1-olefins having up to about 6 carbon atoms each, wherein the weight ratio of polystyrene or polyolefin particle:vinylpyridine is in the range of about 1.5:1 to about 100:1, the suspension polymerization being carried out in the presence of a water-soluble free radical initiating catalyst.
Claim 2
Dependent Claim
108 words
Small polymer particles of polyvinylpyridine of 50 to 2,000 microns diameter having small particles of Ziegler-catalyzed polymer embedded therein, said polymer particles of polyvinylpyridine being produced by the process which comprises polymerizing vinylpyridine in aqueous suspension in the presence of solid particles having diameters in the range 50-600 microns of Ziegler-catalyzed polystyrene or polyolefin of low molecular weight olefins, said polyolefin being derived from 1-olefins having up to about 6 carbon atoms each, wherein the weight ratio of polystyrene or polyolefin particle:vinylpyridine is in the range of about 1.5:1 to about 100:1, the suspension polymerization being carried out in the presence of a water-soluble free radical initiating catalyst.
Claim 3
Dependent Claim
16 words
Small polymer particles of polyvinylpyridine in accordance with claim 1 wherein the Ziegler-catalyzed polymer is polypropylene.
Claim 4
Dependent Claim
31 words
Small polymer particles of polyvinylpyridine in accordance with claim 2 wherein 0.1 to 1 percent by weight of nonionic surfactant on the basis of polyolefin is employed in the aqueous suspension.
Claim 5
Dependent Claim
22 words
Small polymer particles of polyvinylpyridine in accordance with claim 3 wherein the small polymer particles of polyvinylpyridine are substantially spheroidal in shape.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |