US3340238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing polymers of vinyl aromatic sulfonates characterized useful as flocculants
Assignee: Dow Chemical Co
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Filing: 1962-09-07
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Granted: 1967-09-05
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Expires: 1982-09-07
Abstract
No abstract record available.
Inventors
- 👤 William E Smith
- 👤 Volk Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:56
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
207 words
IN A METHOD WHICH COMPRISES POLYMERIZING, AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 0 UP TO 100*C. AND IN THE PRESENCE OF A FREE RADICAL CATALYST, IN THE FORM OF AN AQUEOUS SOLUTION SUBSTANTIALLY FREE OF OXYGEN, FROM ABOUT 2 UP TO ABOUT 25 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF THE AQUEOUS SOLUTION, OF A MONOMER COMPOSITION SELECTED FROM THE GROUP CONSISTING OF MONOCYCLIC ALKALI METAL VINYL AROMATIC SULFONATES OF THE BENZENE SERIES AND MIXTURES THEREOF WITH MONOETHYLENICALLY UNSATURATED MONOMERS POLYMERIZABLE WITH STYRENE WHICH MIXTURE CONTAINS AT LEAST 5 WEIGHT PERCENT OF THE VINYL AROMATIC SULFONATE AND AT LEAST 40 WEIGHT PERCENT OF A HYDROPHILIC MONOMER, TO PROVIDE A WATER-SOLUBLE POLYMER, THE IMPROVEMENT WHICH CONSISTS IN ADDING TO THE AQUEOUS SYSTEM A SUFFICIENT AMOUNT OF A BASIC ALKALI METAL COMPOSITION SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HYDROXIDES AND ALKALI METAL CARBONATES TO PRODUCE A PH OF AT LEAST 11, BUT NOT EXCEEDING AN UPPER LIMIT WITHIN THE RANGE FROM ABOUT 1 WEIGHT PERCENT, AT THE ABOVE SPECIFIED UPPER LIMIT OF MONOMER COMPOSITION CONCENTRATION, TO ABOUT 15 WEIGHT PERCENT, AT THE ABOVE SPECIFIED LOWER LIMIT OF MONOMER COMPOSITION CONCENTRATION, SAID WEIGHT PERCENTAGES BEING BASED ON THE TOTAL WEIGHT OF THE AQUEOUS SYSTEM.
Claim 2
Dependent Claim
207 words
IN A METHOD WHICH COMPRISES POLYMERIZING, AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 0 UP TO 100*C. AND IN THE PRESENCE OF A FREE RADICAL CATALYST, IN THE FORM OF AN AQUEOUS SOLUTION SUBSTANTIALLY FREE OF OXYGEN, FROM ABOUT 2 UP TO ABOUT 25 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF THE AQUEOUS SOLUTION, OF A MONOMER COMPOSITION SELECTED FROM THE GROUP CONSISTING OF MONOCYCLIC ALKALI METAL VINYL AROMATIC SULFONATES OF THE BENZENE SERIES AND MIXTURES THEREOF WITH MONOETHYLENICALLY UNSATURATED MONOMERS POLYMERIZABLE WITH STYRENE WHICH MIXTURE CONTAINS AT LEAST 5 WEIGHT PERCENT OF THE VINYL AROMATIC SULFONATE AND AT LEAST 40 WEIGHT PERCENT OF A HYDROPHILIC MONOMER, TO PROVIDE A WATER-SOLUBLE POLYMER, THE IMPROVEMENT WHICH CONSISTS IN ADDING TO THE AQUEOUS SYSTEM A SUFFICIENT AMOUNT OF A BASIC ALKALI METAL COMPOSITION SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HYDROXIDES AND ALKALI METAL CARBONATES TO PRODUCE A PH OF AT LEAST 11, BUT NOT EXCEEDING AN UPPER LIMIT WITHIN THE RANGE FROM ABOUT 1 WEIGHT PERCENT, AT THE ABOVE SPECIFIED UPPER LIMIT OF MONOMER COMPOSITION CONCENTRATION, TO ABOUT 15 WEIGHT PERCENT, AT THE ABOVE SPECIFIED LOWER LIMIT OF MONOMER COMPOSITION CONCENTRATION, SAID WEIGHT PERCENTAGES BEING BASED ON THE TOTAL WEIGHT OF THE AQUEOUS SYSTEM.
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) | 1970-09-04 | 1971-03-06 | 1971-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-04 | 1975-03-06 | 1975-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-04 | 1979-03-06 | 1979-09-05 | $7700.00 | Window Closed / Lapsed |