US3320303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of terephthalic acid esters
Assignee: BASF SE
•
Filing: 1963-03-19
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Granted: 1967-05-16
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Expires: 1983-03-19
Abstract
No abstract record available.
Inventors
- 👤 Schenk Walter
- 👤 Nienburg Hans
- 👤 Dorschner Oskar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:52
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/08; C07C67/24; C07C67/26; C07C69/00; C07C69/76; C07C69/80; C07C69/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A PROCESS FOR THE PRODUCTION OF ESTERS OF TEREPHTHALIC ACID WHICH COMPRISES: CONVERTING IN A FIRST STAGE AT A TEMPERATURE OF ABOUT 40*C. TO 150*C. A NEUTRAL ALKALI METAL SALT OF TEREPHTHALIC ACID INTO THE ACID ALKALI METAL SALT OF TEREPHTHALIC ACID BY MEANS OF AN ACID HAVING A HIGHER ACIDITY THAN TEREPHTHALIC ACID AND BEING SELECTED FROM THE GROUP CONSISTING OF BENZENECARBOXYLIC ACIDS AND THE CORRESPONDING ANHYDRIDES AND ACID ALKALI METAL SALTS OF SAID BENZENECARBOXYLIC ACIDS IN AN AMOUNT SUFFICIENT TO ACHIEVE A PH IN SAID FIRST STAGE OF ABOUT 5.4 TO 6.1; REACTING SAID ACID ALKALI METAL SALT OF TEREPHTHALIC ACID IN A SECOND STAGE AT A TEMPERATURE OF ABOUT 80*C. TO 350*C. WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKANOLS OF 1 TO 4 CARBON ATOMS, A,W ALKANEDIOLS OF 2 TO 10 CARBON ATOMS AND 1,2-EPOXIDES OF 2 TO 4 CARBON ATOMS; AND SEPARATING THE RESULTING ESTER OF TEREPHTHALIC ACID.
Claim 2
Dependent Claim
155 words
A PROCESS FOR THE PRODUCTION OF ESTERS OF TEREPHTHALIC ACID WHICH COMPRISES: CONVERTING IN A FIRST STAGE AT A TEMPERATURE OF ABOUT 40*C. TO 150*C. A NEUTRAL ALKALI METAL SALT OF TEREPHTHALIC ACID INTO THE ACID ALKALI METAL SALT OF TEREPHTHALIC ACID BY MEANS OF AN ACID HAVING A HIGHER ACIDITY THAN TEREPHTHALIC ACID AND BEING SELECTED FROM THE GROUP CONSISTING OF BENZENECARBOXYLIC ACIDS AND THE CORRESPONDING ANHYDRIDES AND ACID ALKALI METAL SALTS OF SAID BENZENECARBOXYLIC ACIDS IN AN AMOUNT SUFFICIENT TO ACHIEVE A PH IN SAID FIRST STAGE OF ABOUT 5.4 TO 6.1; REACTING SAID ACID ALKALI METAL SALT OF TEREPHTHALIC ACID IN A SECOND STAGE AT A TEMPERATURE OF ABOUT 80*C. TO 350*C. WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKANOLS OF 1 TO 4 CARBON ATOMS, A,W ALKANEDIOLS OF 2 TO 10 CARBON ATOMS AND 1,2-EPOXIDES OF 2 TO 4 CARBON ATOMS; AND SEPARATING THE RESULTING ESTER OF TEREPHTHALIC ACID.
References Cited (Backward Citations)
US2841615A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-15 | 1970-11-14 | 1971-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-15 | 1974-11-14 | 1975-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-15 | 1978-11-14 | 1979-05-16 | $7700.00 | Window Closed / Lapsed |