US4833198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suspending agent for the suspension polymerization of water-soluble monomers
Assignee: Dow Chemical Co
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Filing: 1985-07-22
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Granted: 1989-05-23
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Expires: 2005-07-22
Abstract
Abstract A suspending agent useful in a water-in-oil suspension polymerization process comprises a fumed silica particulate having a hydrophobic character and a hydrophobic polymer. The suspending agent is useful in providing uniformly sized aqueous fluid absorbent polymer beads.
Inventors
- 👤 Frederick W. Stanley, Jr.
- 👤 Jack C. Lamphere
- 👤 Yohannes Chonde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:29
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08F; C08F2/00; C08F2/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
A suspending agent useful in suspension polymerization processes, said suspending agent comprising (1) fumed silicon dioxide, and (2) a copolymer of acrylic acid and lauryl methacrylate.
Claim 2
Dependent Claim
26 words
A suspending agent useful in suspension polymerization processes, said suspending agent comprising (1) fumed silicon dioxide, and (2) a copolymer of acrylic acid and lauryl methacrylate.
References Cited (Backward Citations)
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US4028285A
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US4172122A
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US4235768A
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US4431765A
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US4425465A
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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) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |