US2809959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of high-viscosity sulfona-
Assignee: —
•
Filing: —
•
Granted: 1957-10-15
•
Expires: 1974-10-15
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:44
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F212/00; C08F212/02; C08F212/04; C08F212/14; C08F212/30; C08F8/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
A METHOD FOR THE PREPARATION OF RESIN SULFONATES THAT ARE CAPABLE OF BEING HIGHLY SWOLLEN BY AQUEOUS LIQUIDS TO FROM AQUEOUS COMPOSITIONS POSSESSING SUBSTANTIALLY STABLE VISCOSITIES GREATER THAN THOSE OF THE AQUEOUS LIQUID INGREDIENTS OF THE COMPOSITIONS, WHICH METHOD COMPRISES REACTING TOGETHER BY ADMIXING SLOWLY AND WITH VIGOROUS AGITATION, IN THE PRESENCE OF LIQUID SULFUR DIOXIDE AS A REACTION MEDIUM AND AT A REACTION TEMPERATURE BETWEEN -40* AND +10* C., CHLOROSULFONIC ACID AND A POLYMERT OF A MONOVINYLAROMATIC HYDROCARBON OF THE BENZENE SERIES IN AMOUNTS CORRESPONDING TO AT LEAST 0.7 MOLECULAR PROPORTION OF CHLOROSULFONIC ACID FOR EACH MOLECULAR PROPORTION OF MONOMERIC COMPOUND CHEMICALLY COMBINED IN THE POLYMER AND AN AMOUNT OF LIQUID SULFUR DIOXIDE CORRESPONDING TO AT LEAST 80 PERCENT BY WEIGHT OF THE WHOLE REACTION MIXTURE, SAID POLYMER BEING SUBSTANTIALLY FREE OF CROSSLINKAGES, AND CONTAINING AT LEAST 60 PERCENT BY WEIGHT OF AT LEAST ONE MONOVINYLAROMATIC HYDROCARBON OF THE BENZENE SERIES CHEMICALLY COMBINED THEREIN, THE POLYMER BEING ONE WHOSE SOLUTION IN NINE TIMES ITS WEIGHT OF TOLUENE HAS A VISCOSITY OF AT LEAST 82.4 CENTIPOISES AT A TEMPERATURE OF 25* C.
Claim 2
Independent Claim
182 words
A METHOD FOR THE PREPARATION OF RESIN SULFONATES THAT ARE CAPABLE OF BEING HIGHLY SWOLLEN BY AQUEOUS LIQUIDS TO FROM AQUEOUS COMPOSITIONS POSSESSING SUBSTANTIALLY STABLE VISCOSITIES GREATER THAN THOSE OF THE AQUEOUS LIQUID INGREDIENTS OF THE COMPOSITIONS, WHICH METHOD COMPRISES REACTING TOGETHER BY ADMIXING SLOWLY AND WITH VIGOROUS AGITATION, IN THE PRESENCE OF LIQUID SULFUR DIOXIDE AS A REACTION MEDIUM AND AT A REACTION TEMPERATURE BETWEEN -40* AND +10* C., CHLOROSULFONIC ACID AND A POLYMERT OF A MONOVINYLAROMATIC HYDROCARBON OF THE BENZENE SERIES IN AMOUNTS CORRESPONDING TO AT LEAST 0.7 MOLECULAR PROPORTION OF CHLOROSULFONIC ACID FOR EACH MOLECULAR PROPORTION OF MONOMERIC COMPOUND CHEMICALLY COMBINED IN THE POLYMER AND AN AMOUNT OF LIQUID SULFUR DIOXIDE CORRESPONDING TO AT LEAST 80 PERCENT BY WEIGHT OF THE WHOLE REACTION MIXTURE, SAID POLYMER BEING SUBSTANTIALLY FREE OF CROSSLINKAGES, AND CONTAINING AT LEAST 60 PERCENT BY WEIGHT OF AT LEAST ONE MONOVINYLAROMATIC HYDROCARBON OF THE BENZENE SERIES CHEMICALLY COMBINED THEREIN, THE POLYMER BEING ONE WHOSE SOLUTION IN NINE TIMES ITS WEIGHT OF TOLUENE HAS A VISCOSITY OF AT LEAST 82.4 CENTIPOISES AT A TEMPERATURE OF 25* C.
References Cited (Backward Citations)
US2645621A
Cited
US2691644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |