US2763634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulphonation method
Assignee: Dow Chemical Co
•
Filing: 1952-02-21
•
Granted: 1956-09-18
•
Expires: 1972-02-21
Abstract
No abstract record available.
Inventors
- 👤 Arthur S Teot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:37
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
184 words
A METHOD WHICH COMPRISES FORMING A SOLUTION OF AN ALKENYL AROMATIC RESIN IN A LIQUID CONSISTING OF POLYCHLORINATED ALIPHATIC HYDROCARBON MATERIAL, FORMING ANOTHER SOLUTION OF SULPHUR TRIOXIDE IN SEVERAL TIMES ITS VOLUME OF A SUBSTANTIALLY INERT FLUID DILUENT SELECTED FROM THE GROUP CONSISTING OF METHYLENE CHLORIDE, NITROGEN AND DRY AIR, THERE BEING PRESENT, IN AT LEAST ONE OF SAID SOLUTIONS, METHYLENE CHLORIDE IN AMOUNT CORRESPONDING TO AT LEAST 20 PER CENT OF THE TOTAL WEIGHT OF POLYCHLORINATED ALIPHATIC HYDROCARBON MATERIAL IN ALL OF THE STARTING MATERIALS, AND ADMIXING THE TWO SOLUTIONS WHILE AGITATING AND MAINTAINING THE MIXTURE AT REACTION TEMPERATURE BETWEEN -20* AND 45* C., THE SULPHUR TRIOXIDE BEING EMPLOYED IN A PROPORTION CORRESPONDING TO THE THEORETICALLY REQUIRED FOR INTRODUCTION OF AN AVERAGE OF FROM 0.8 TO 3 SULFONIC ACID RADICALS INTO THE RESIN PER AROMATIC NUCLEUS OF THE LATTER, THE COMBINED WEIGHT OF THE SULPHUR TRIOXIDE AND ALKENYL AROMATIC RESIN STARTING MATERIALS BEING SUCH AS TO CORRESPOND TO BETWEEN 0.5 AND 10 PER CENT OF THE WEIGHT OF THE REACTION MIXTURE, AND THE LIQUID POLYCHLORIANTED ALIPHATIC HYDROCARBON MATERIAL SERVING AS A REACTION MEDIUM.
Claim 2
Independent Claim
184 words
A METHOD WHICH COMPRISES FORMING A SOLUTION OF AN ALKENYL AROMATIC RESIN IN A LIQUID CONSISTING OF POLYCHLORINATED ALIPHATIC HYDROCARBON MATERIAL, FORMING ANOTHER SOLUTION OF SULPHUR TRIOXIDE IN SEVERAL TIMES ITS VOLUME OF A SUBSTANTIALLY INERT FLUID DILUENT SELECTED FROM THE GROUP CONSISTING OF METHYLENE CHLORIDE, NITROGEN AND DRY AIR, THERE BEING PRESENT, IN AT LEAST ONE OF SAID SOLUTIONS, METHYLENE CHLORIDE IN AMOUNT CORRESPONDING TO AT LEAST 20 PER CENT OF THE TOTAL WEIGHT OF POLYCHLORINATED ALIPHATIC HYDROCARBON MATERIAL IN ALL OF THE STARTING MATERIALS, AND ADMIXING THE TWO SOLUTIONS WHILE AGITATING AND MAINTAINING THE MIXTURE AT REACTION TEMPERATURE BETWEEN -20* AND 45* C., THE SULPHUR TRIOXIDE BEING EMPLOYED IN A PROPORTION CORRESPONDING TO THE THEORETICALLY REQUIRED FOR INTRODUCTION OF AN AVERAGE OF FROM 0.8 TO 3 SULFONIC ACID RADICALS INTO THE RESIN PER AROMATIC NUCLEUS OF THE LATTER, THE COMBINED WEIGHT OF THE SULPHUR TRIOXIDE AND ALKENYL AROMATIC RESIN STARTING MATERIALS BEING SUCH AS TO CORRESPOND TO BETWEEN 0.5 AND 10 PER CENT OF THE WEIGHT OF THE REACTION MIXTURE, AND THE LIQUID POLYCHLORIANTED ALIPHATIC HYDROCARBON MATERIAL SERVING AS A REACTION MEDIUM.
References Cited (Backward Citations)
US2533211A
Cited
US2691644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |