Patent US2940962A successfully refreshed from Google Patents.
US2940962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of crystalline polypropylenes
Assignee: UCB SA
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Filing: 1958-01-24
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Granted: 1960-06-14
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Expires: 1978-01-24
Abstract
No abstract record available.
Inventors
- 👤 Verheyden Albert
- 👤 Ochsner Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:26
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PROCESS FOR THE PREPARATION OF HIGH CRYSTALLINE POLYPROPYLENE POLYMERS WHICH COMPRISES CONTACTING PROPYLENE, AT A TEMPERATURE BETWEEN 0 TO 40*C. AND UNDR A PRESSURE BETWEEN 1 AND 100 KG./CM.2, WITH A CATALYST PREPARED BY REACTING ONE MOLE OF TITANIUM TETRACHLORIDE WITH 1 TO 4 MOLES OF AN ORGANOSODIUM COMPOUND AND 0.05 TO 3 MOLES OF AN ORGANOCADMIUM COMPOUND, SAID ORGANOMETALLIC COMPOUNDS HAVING THE GENERAL FORMULA RNME WHEREILN ME REPRESENTS AN ATOM OF A METAL SELECTED FROM THE GROUP CONSISTING OF SODIUM AND CADMIUM, R AN ALIPHATIC HYDROCARBON RADICAL CONTAINING FROM 2 TO 5 CARBON ATOMS, AND N IS A WHOLE NUMBER FROM 1 TO 2, INCLUSIVE, ACCORDING TO THE VALENCY OF THE METAL, AND SEPARATING THE HIGH CRYSTALLINE POLYPROPYLENE POLYMERS THUS OBTAINED.
Claim 2
Dependent Claim
123 words
A PROCESS FOR THE PREPARATION OF HIGH CRYSTALLINE POLYPROPYLENE POLYMERS WHICH COMPRISES CONTACTING PROPYLENE, AT A TEMPERATURE BETWEEN 0 TO 40*C. AND UNDR A PRESSURE BETWEEN 1 AND 100 KG./CM.2, WITH A CATALYST PREPARED BY REACTING ONE MOLE OF TITANIUM TETRACHLORIDE WITH 1 TO 4 MOLES OF AN ORGANOSODIUM COMPOUND AND 0.05 TO 3 MOLES OF AN ORGANOCADMIUM COMPOUND, SAID ORGANOMETALLIC COMPOUNDS HAVING THE GENERAL FORMULA RNME WHEREILN ME REPRESENTS AN ATOM OF A METAL SELECTED FROM THE GROUP CONSISTING OF SODIUM AND CADMIUM, R AN ALIPHATIC HYDROCARBON RADICAL CONTAINING FROM 2 TO 5 CARBON ATOMS, AND N IS A WHOLE NUMBER FROM 1 TO 2, INCLUSIVE, ACCORDING TO THE VALENCY OF THE METAL, AND SEPARATING THE HIGH CRYSTALLINE POLYPROPYLENE POLYMERS THUS OBTAINED.
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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |