US2604461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of sulfonated alkenyl aromatic resins
Assignee: Dow Chemical Co
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Filing: 1950-07-22
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Granted: 1952-07-22
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Expires: 1970-07-22
Abstract
No abstract record available.
Inventors
- 👤 Harold H Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:52
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/14; C08F; C08F8/00; C08F8/44; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
206 words
A METHOD OF MAKING A SULPHONATED POLYMER OF AN ALKENYL AROMATIC RESIN WHICH COMPRISES IMMERSING THE RESIN, IN THE FORM OF A FILM OF FROM 0.01 TO 0.05 INCH THICKNESS, IN SULPHURIC ACID OF FROM 90 TO 100 PER CENT CONCENTRATION, HEATING THE MIXTURE AT TEMPERATURES BETWEEN 140* AND 200* C. UNTIL THE RESIN IS SULPHONATED THROUGHOUT TO A SULPHURIC ACID-SWOLLEN SULPHONATED RESIN WHICH REMAINS INSOLUBLE UPON IMMERSION IN WATER, SAID TIME OF HEATING BEING BETWEEN 5 AND 60 MINUTES, TREATING THE SULPHURIC ACID-SWOLLEN SULPHONATED RESIN WITH WATER IN THE AMOUNT REQUIRED TO FORM WITH THE SULPHURIC ACID AN AQUEOUS SULPHURIC ACID SOLUTION HAVING A CONCENTRATION OF BETWEEN 20 AND 85 PER CENT BY WEIGHT, WHEREBY THE SULPHONATED RESIN BODY IS CAUSED TO SHRINK AND EXUDE A CONSIDERABLE PART OF THE SULPHURIC ACID WITH WHICH IT WAS SWOLLEN, REMOVING EXUDED SULPHURIC ACID FROM THE SULPHONATED RESIN BODY, EXTRACTING RESIDUAL SULPHURIC ACID FROM THE LATTER WITH A LIQUID EXTRACTANT OF THE GROUP CONSISTING OF SATURATED ALIPHATIC MONOCARBOXYLIC ACIDS HAVING FROM 1 TO 3 CARBON ATOMS IN THE MOLECULE, ACETONE, A CONCENTRATED AQUEOUS HYDROCHLORIC ACID SOLUTION, DIOXANE AND DIALKYL ETHERS HAVING FROM 4 TO 6 CARBON ATOMS IN THE MOLECULE, AND VAPORIZING RESIDUAL EXTRACTANT FROM THE SULPHONATED RESIN
Claim 2
Independent Claim
206 words
A METHOD OF MAKING A SULPHONATED POLYMER OF AN ALKENYL AROMATIC RESIN WHICH COMPRISES IMMERSING THE RESIN, IN THE FORM OF A FILM OF FROM 0.01 TO 0.05 INCH THICKNESS, IN SULPHURIC ACID OF FROM 90 TO 100 PER CENT CONCENTRATION, HEATING THE MIXTURE AT TEMPERATURES BETWEEN 140* AND 200* C. UNTIL THE RESIN IS SULPHONATED THROUGHOUT TO A SULPHURIC ACID-SWOLLEN SULPHONATED RESIN WHICH REMAINS INSOLUBLE UPON IMMERSION IN WATER, SAID TIME OF HEATING BEING BETWEEN 5 AND 60 MINUTES, TREATING THE SULPHURIC ACID-SWOLLEN SULPHONATED RESIN WITH WATER IN THE AMOUNT REQUIRED TO FORM WITH THE SULPHURIC ACID AN AQUEOUS SULPHURIC ACID SOLUTION HAVING A CONCENTRATION OF BETWEEN 20 AND 85 PER CENT BY WEIGHT, WHEREBY THE SULPHONATED RESIN BODY IS CAUSED TO SHRINK AND EXUDE A CONSIDERABLE PART OF THE SULPHURIC ACID WITH WHICH IT WAS SWOLLEN, REMOVING EXUDED SULPHURIC ACID FROM THE SULPHONATED RESIN BODY, EXTRACTING RESIDUAL SULPHURIC ACID FROM THE LATTER WITH A LIQUID EXTRACTANT OF THE GROUP CONSISTING OF SATURATED ALIPHATIC MONOCARBOXYLIC ACIDS HAVING FROM 1 TO 3 CARBON ATOMS IN THE MOLECULE, ACETONE, A CONCENTRATED AQUEOUS HYDROCHLORIC ACID SOLUTION, DIOXANE AND DIALKYL ETHERS HAVING FROM 4 TO 6 CARBON ATOMS IN THE MOLECULE, AND VAPORIZING RESIDUAL EXTRACTANT FROM THE SULPHONATED RESIN
References Cited (Backward Citations)
US2400720A
Cited
US2446536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |