Patent US3275601A successfully refreshed from Google Patents.
US3275601A
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Manufacture of polycarbonates using tertiary amines, quaternary amines and salts thereof as catalysts
Assignee: Bayer AG
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Filing: 1965-07-28
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Granted: 1966-09-27
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Expires: 1985-07-28
Abstract
No abstract record available.
Inventors
- 👤 Schnell Hermann
- 👤 Bottenbruch Ludwig
- 👤 Krimm Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:58
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/26; C08G64/28; C08G64/04; C08G64/06; C08G64/22; C08G64/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN THE PROCESS FOR THE MANUFACTURE OF POLYCARBONATES BY REACTING AN ORGANIC DIHYDROXY COMPOUND WHICH IS A DI(MONOHYDROXY-MONOCYCLIC ARYL) ALIPHATIC HYDROCARBON IN WHICH EACH SAID MONOHYDROXY-MONOCYCLIC ARYL SUBSTITUENT IS ATTACHED TO THE SAME CARBON ATOM OF SAID ALIPHATIC HYDROCARBON MONIETY WITH A CARBONIC ACID DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF PHOSGENE AND CHLOROCARBONIC ACID ESTERS OF SAID ORGANIC DIHYDROXY COMPOUNDS IN AQUEOUS ALKALINE SOLUTION, THE IMPROVEMENT COMPRISES INCREASING THE SPEED OF THE REACTION BY EMPLOYING AS A CATALYSTT IN SAID REACTION FROM ABOUT 0.05 TO ABOUT 5% BY WEIGHT, BASED ON THE WEIGHT OF SAID DIHYDROXY COMPOUND, OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF TERTIALY AMINES, QUANTERNARY AMINES AND SALTS THEREOF TEMPERATURES FROM ABOUT 0*C. TO ABOUT 100*C.
Claim 2
Dependent Claim
121 words
IN THE PROCESS FOR THE MANUFACTURE OF POLYCARBONATES BY REACTING AN ORGANIC DIHYDROXY COMPOUND WHICH IS A DI(MONOHYDROXY-MONOCYCLIC ARYL) ALIPHATIC HYDROCARBON IN WHICH EACH SAID MONOHYDROXY-MONOCYCLIC ARYL SUBSTITUENT IS ATTACHED TO THE SAME CARBON ATOM OF SAID ALIPHATIC HYDROCARBON MONIETY WITH A CARBONIC ACID DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF PHOSGENE AND CHLOROCARBONIC ACID ESTERS OF SAID ORGANIC DIHYDROXY COMPOUNDS IN AQUEOUS ALKALINE SOLUTION, THE IMPROVEMENT COMPRISES INCREASING THE SPEED OF THE REACTION BY EMPLOYING AS A CATALYSTT IN SAID REACTION FROM ABOUT 0.05 TO ABOUT 5% BY WEIGHT, BASED ON THE WEIGHT OF SAID DIHYDROXY COMPOUND, OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF TERTIALY AMINES, QUANTERNARY AMINES AND SALTS THEREOF TEMPERATURES FROM ABOUT 0*C. TO ABOUT 100*C.
References Cited (Backward Citations)
US3028365A
Cited
US3136741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |