US5152903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked cationic polymeric microparticles
Assignee: BASF Corp
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Filing: 1991-02-19
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Granted: 1992-10-06
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Expires: 2011-02-19
Abstract
Abstract Novel compositions comprising cationic polymeric microparticles are disclosed, along with a method for their production. The products are useful in flocculating a wide variety of dispersions of suspended solids.
Inventors
- 👤 Roger E. Neff
- 👤 Roderick G. Ryles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:36
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; Y; Y10; Y10S; Y10S524/00; Y10S524/922
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
A method of flocculating a dispersion of suspended solids which comprises (a) adding to the dispersion from about 0.1 to about 50,000 parts per million of dispersion solids of an aqueous solution of a water-soluble, cross-linked, cationic, polymeric flocculant, having an unswollen number average particle size diameter of less than about 0.5 micron, a solution viscosity of from about 1.2 to about 1.8 mPa.s and a cross-linking agent content above about 4 molar parts per million based on the monomeric units present in the polymer.
Claim 2
Independent Claim
85 words
A method of flocculating a dispersion of suspended solids which comprises (a) adding to the dispersion from about 0.1 to about 50,000 parts per million of dispersion solids of an aqueous solution of a water-soluble, cross-linked, cationic, polymeric flocculant, having an unswollen number average particle size diameter of less than about 0.5 micron, a solution viscosity of from about 1.2 to about 1.8 mPa.s and a cross-linking agent content above about 4 molar parts per million based on the monomeric units present in the polymer.
Claim 3
Dependent Claim
27 words
A method as defined in claim 1 wherein the polymeric flocculant has a cross-linking agent content of from about 4 to about 2000 molar parts per million.
Claim 4
Dependent Claim
27 words
A method as defined in claim 1 wherein the polymeric flocculant has a cross-linking agent content of from about 50 to about 500 molar parts per million.
Claim 5
Dependent Claim
24 words
A method as defined in claim 1 wherein said polymeric flocculant is a polymer formed from an acrylamide and at least one cationic monomer.
Claim 6
Dependent Claim
20 words
A method as defined in claim 1 wherein said polymeric flocculant is a polymer formed from acrylamide and acryloxyethyltrimethylammonium chloride.
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) | 1995-10-06 | 1996-04-06 | 1996-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-06 | 2000-04-06 | 2000-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-06 | 2004-04-06 | 2004-10-06 | $7700.00 | Window Closed / Lapsed |