US3143525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polycarbonates by suspension polymerization
Assignee: Monsanto Co
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Filing: 1959-02-27
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Granted: 1964-08-04
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Expires: 1979-02-27
Abstract
No abstract record available.
Inventors
- 👤 John B Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:58
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/22; C08G64/24; Y; Y10; Y10S; Y10S525/00; Y10S525/917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A PROCESS FOR PREPARING POLYCARBONATE RESINS BY SUSPENSION POLYMERIZATION WHICH COMPRISES REACTING A BIS(HYDROXYARYL) COMPOUND WITH AT LEAST AN EQUIMOLAR PROPORTION OF PHOSGENE AT A TEMPERATURE OF FROM ABOVE THE FREEZING POINT OF THE REACTION MIXTURE TO 40*C. IN A SUBSTANTIALLY OXYGEN-FREE AQUEOUS REACTION SYSTEM IN THE PRESENCE OF (A) FROM 30-1000% BY WEIGHT, BASED UPON THE TOTAL WEIGHT OF REACTANTS, OF AN INERT WATER-IMMISCIBLE ORGANIC SOLVENT FOR THE POLYCARBONATE RESIN FORMED, (B) AT LEAST 2 MOLS OF A WATER-SOLUBLE ACID ACCEPTOR PER MOL OF PHOSGENE EMPLOYED, (C) FROM 0.001-2% BY WEIGHT, BASED UPON THE TOTAL WEIGHT OF REACTANTS, OF A QUATERNARY AMMONIUM SALTS CONTAINING FROM 6-14 CARBON ATOMS AND (D) FROM 0.01-5% BY WEIGHT, BASED UPON THE TOTAL WEIGHT OF REACTANTS PLUS ORGANIC SOLVENT, OF A SUPENDING AGENT; THE VOLUME OF WATER EMPLOYED IN THE AQUEOUS PHASE BEING EQUAL TO FROM 0.5-10 TIMES THE VOLUME OF THE ORGANIC SOLVENT EMPLOYED; SAID BIS(HYDROXYARYL) COMPOUND CORRESPONDING TO A FORMULA SELECTED FROM THE GROUP CONSISTING OF:
Claim 2
Dependent Claim
164 words
A PROCESS FOR PREPARING POLYCARBONATE RESINS BY SUSPENSION POLYMERIZATION WHICH COMPRISES REACTING A BIS(HYDROXYARYL) COMPOUND WITH AT LEAST AN EQUIMOLAR PROPORTION OF PHOSGENE AT A TEMPERATURE OF FROM ABOVE THE FREEZING POINT OF THE REACTION MIXTURE TO 40*C. IN A SUBSTANTIALLY OXYGEN-FREE AQUEOUS REACTION SYSTEM IN THE PRESENCE OF (A) FROM 30-1000% BY WEIGHT, BASED UPON THE TOTAL WEIGHT OF REACTANTS, OF AN INERT WATER-IMMISCIBLE ORGANIC SOLVENT FOR THE POLYCARBONATE RESIN FORMED, (B) AT LEAST 2 MOLS OF A WATER-SOLUBLE ACID ACCEPTOR PER MOL OF PHOSGENE EMPLOYED, (C) FROM 0.001-2% BY WEIGHT, BASED UPON THE TOTAL WEIGHT OF REACTANTS, OF A QUATERNARY AMMONIUM SALTS CONTAINING FROM 6-14 CARBON ATOMS AND (D) FROM 0.01-5% BY WEIGHT, BASED UPON THE TOTAL WEIGHT OF REACTANTS PLUS ORGANIC SOLVENT, OF A SUPENDING AGENT; THE VOLUME OF WATER EMPLOYED IN THE AQUEOUS PHASE BEING EQUAL TO FROM 0.5-10 TIMES THE VOLUME OF THE ORGANIC SOLVENT EMPLOYED; SAID BIS(HYDROXYARYL) COMPOUND CORRESPONDING TO A FORMULA SELECTED FROM THE GROUP CONSISTING OF:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |