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US2821522A
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Preparation of water-soluble sulfonation products of polymeric ar-vinyltoluenes
Assignee: Dow Chemical Co
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Filing: 1954-11-24
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Granted: 1958-01-28
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Expires: 1974-11-24
Abstract
No abstract record available.
Inventors
- 👤 William C Bauman
- 👤 Harold H Roth
- 👤 Hugh B Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:05
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C07; C07C; C07C303/00; C07C303/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A METHOD FOR THE PREPARATION OF WATER-SOLUBLE SULFONATES, WHICH METHOD COMPRISES ADMIZING, AT A SULFONATION REACTION TEMPERATURE BETWEEN -20* AND +40*C. AND WITH AGITATION, IN THE PRESENCE OF AN INERT LIQUID DILUENT, A SULFUR TRIOXIDE SULFONATION AGENT SELECTED FROM THE GROUP CONSISTING OF SULFUR TRIOXIDE AND ETHER COMPLEXES OF SULFUR TRIOXIDE, AND A DRY SOLIDD POLYMER OF AR-VINYLTOLUENE IN A FINELY DIVIDED FORM CONSISTING ESSENTIALLY OF PARTICLES HAVING AVERAGE DIAMETERS NOT GREATER THAN ABOUT 10 MICRONS AND AGGREGATES OF SUCH PARTICLES, THE AVERAGE DIAMETER OF SUCH AGGREGATES BEING NOT GREATER THAN ABOUT 15 MICRONS, IN AMOUNTS CORRESPONDING TO AT LEAST 0.7 MOLECULAR PROPORTION OF SULFUR TRIOXIDE FOR EACH MOLECULAR PROPORTION OF MONOMERIC COMPOUND CHEMICALLY COMBINED IN THE POLYMER, SAID POLYMER BEING SOLUBLE AND SUBSTANTIALLY FREE OF CROSS-LINKAGES AND CONTAINING AT LEAST 60 PERCENT BY WEIGHT OF AT LEAST ONE AR-VINYLTOLUENE CHEMICALLY COMBINED THEREIN, SAID INERT LIQUID DILUENT BEING CAPABLE OF AT LEAST SWELLING THE PARTICLES OF SAID SOLID POLYMER STARTING MATERIAL.
Claim 2
Independent Claim
161 words
A METHOD FOR THE PREPARATION OF WATER-SOLUBLE SULFONATES, WHICH METHOD COMPRISES ADMIZING, AT A SULFONATION REACTION TEMPERATURE BETWEEN -20* AND +40*C. AND WITH AGITATION, IN THE PRESENCE OF AN INERT LIQUID DILUENT, A SULFUR TRIOXIDE SULFONATION AGENT SELECTED FROM THE GROUP CONSISTING OF SULFUR TRIOXIDE AND ETHER COMPLEXES OF SULFUR TRIOXIDE, AND A DRY SOLIDD POLYMER OF AR-VINYLTOLUENE IN A FINELY DIVIDED FORM CONSISTING ESSENTIALLY OF PARTICLES HAVING AVERAGE DIAMETERS NOT GREATER THAN ABOUT 10 MICRONS AND AGGREGATES OF SUCH PARTICLES, THE AVERAGE DIAMETER OF SUCH AGGREGATES BEING NOT GREATER THAN ABOUT 15 MICRONS, IN AMOUNTS CORRESPONDING TO AT LEAST 0.7 MOLECULAR PROPORTION OF SULFUR TRIOXIDE FOR EACH MOLECULAR PROPORTION OF MONOMERIC COMPOUND CHEMICALLY COMBINED IN THE POLYMER, SAID POLYMER BEING SOLUBLE AND SUBSTANTIALLY FREE OF CROSS-LINKAGES AND CONTAINING AT LEAST 60 PERCENT BY WEIGHT OF AT LEAST ONE AR-VINYLTOLUENE CHEMICALLY COMBINED THEREIN, SAID INERT LIQUID DILUENT BEING CAPABLE OF AT LEAST SWELLING THE PARTICLES OF SAID SOLID POLYMER STARTING MATERIAL.
References Cited (Backward Citations)
US2283236A
Cited
US2500149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |